Patent US4620667A successfully refreshed from Google Patents.
US4620667A
Expired / Lapsed
US
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Hot water heating system having minimum hot water use based on minimum water temperatures and time of heating
Assignee: PRO-TEMP CONTROLS
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Filing: 1986-02-10
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Granted: 1986-11-04
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Expires: 2006-02-10
Abstract
Abstract A conventional hot water heating system generally of the type for heating water in multiple units of hotels, motels, schools and the like and using any heating medium has a processor and control assembly which is operationally connected to at least a water temperature sensing means and a heating control means thereof. The processor and control assembly divides the time into exact time periods, say one-half hour, and the time periods are grouped into a group of consecutive time periods, say a week. Taking any individual time period, the time periods are checked around the time period which the present time period is a repeat and time periods directly preceding the present time period, and the operational water temperature for the present time period is chosen, as well as the amount of heat required to maintain the water at that temperature on a percentage basis of heating taken from one hundred percent. In addition, the assembly exactly records the various settings throghout that particular time period and when the time period comes up again one week from now, the new settings are calculated in the same manner but using the previous time period being repeated.
Inventors
- 👤 Tom R. Vandermeyden
- 👤 Oscar R. Dufau
- 👤 Frederick Blau, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:55
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/10; F24D19/1006; F24D19/1051; F24H; F24H15/00; F24H15/20; F24H15/212; F24H15/215; F24H15/219; F24H15/30; F24H15/355; F24H15/40; F24H15/414; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1917
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
411 words
In a water heater contol system for constantly controlling the heating and use of hot water from a water heater unit of the type having water heater means with a water heater control means therefor converting between on for heating water and off free of heating water, water inlet means for feeding water to the water heater means to be heated, water outlet means for feeding heated water from the water heater means, water distribution means operably connected to the water outlet means for distributing hot water to be used; the water heater control system further including: water temperature sensor means at least operably connected to said water outlet means for sensing the temperature of the water ready to flow to said water distribution means; processor and control means operationally connected to said water temperature sensor means and said water heating control means for determining the start of a particular time period which is one of a definite group of consecutive time periods and each is a repeat of the same one of preceding groups of time periods, for setting a generally exact water temperature above a given minimum water temperature for said water temperature sensor means and an overall portion of on time out of full time for said water heater control means as regulated on and off by the temperature sensed by said water temperature sensor means for throughout said particular time period exactly according to the overall average of actual settings recorded in actual use during at least certain of a previous of said same one of a previous group of time periods and those close to said previous group of time periods and those closely approaching said present particular time period, for actually recording directly exactly as they occur of water temperatures for said water temperature sensor means and portions of time for said water heater control means throughout and according to actual use of said water temperature sensor means and said water heater control means during the particular time period, for repeating for each succeeding of said group of consecutive time periods to the end thereof, for starting and continuing use of a next group of consecutive time periods followed by continuing with following groups of consecutive time periods and based on the average of the present actually recorded settings of said certain of said previous same one and those close to said previous same one and those closely approaching said then present particular time period.
Claim 2
Dependent Claim
411 words
In a water heater contol system for constantly controlling the heating and use of hot water from a water heater unit of the type having water heater means with a water heater control means therefor converting between on for heating water and off free of heating water, water inlet means for feeding water to the water heater means to be heated, water outlet means for feeding heated water from the water heater means, water distribution means operably connected to the water outlet means for distributing hot water to be used; the water heater control system further including: water temperature sensor means at least operably connected to said water outlet means for sensing the temperature of the water ready to flow to said water distribution means; processor and control means operationally connected to said water temperature sensor means and said water heating control means for determining the start of a particular time period which is one of a definite group of consecutive time periods and each is a repeat of the same one of preceding groups of time periods, for setting a generally exact water temperature above a given minimum water temperature for said water temperature sensor means and an overall portion of on time out of full time for said water heater control means as regulated on and off by the temperature sensed by said water temperature sensor means for throughout said particular time period exactly according to the overall average of actual settings recorded in actual use during at least certain of a previous of said same one of a previous group of time periods and those close to said previous group of time periods and those closely approaching said present particular time period, for actually recording directly exactly as they occur of water temperatures for said water temperature sensor means and portions of time for said water heater control means throughout and according to actual use of said water temperature sensor means and said water heater control means during the particular time period, for repeating for each succeeding of said group of consecutive time periods to the end thereof, for starting and continuing use of a next group of consecutive time periods followed by continuing with following groups of consecutive time periods and based on the average of the present actually recorded settings of said certain of said previous same one and those close to said previous same one and those closely approaching said then present particular time period.
Claim 3
Dependent Claim
75 words
In a water heater control system as defined in claim 1 in which said settings associated with said processor and control means for said water temperature sensor means and said water heating control means are exactly according to the overall average of actual settings recorded in actual use during at least certain of those closely following said same one of said previous group of time periods and those closely approaching said present particular time period.
Claim 4
Dependent Claim
77 words
In a water heater control system as defined in claim 1 in which said settings associated with said processor and control means for said water temperature sensor means and said water heating control means are exactly according to the overall average of actual settings recorded in actual use during at least certain of the two closely following said same one of said previous group of time periods and the two closely approaching said present particular time period.
Claim 5
Dependent Claim
71 words
In a water heater control system as defined in claim 1 in which said settings associated with said processor and control means for said water temperature sensor means and said water heating control means are exactly according to the larger of actual settings recorded in actual use during the two following said same one of a previous group of time periods and the two directly preceding said present particular time period.
Claim 6
Dependent Claim
70 words
In a water heater control system as defined in claim 1 in which said settings associated with said processor and control means for said water temperature sensor means and said water heating control means are exactly according to the larger of the actual settings recorded in actual use during that following said same one of a previous group of time periods and that directly preceding said present particular time period.
Claim 7
Dependent Claim
46 words
In a water heater control system as defined in claim 1 in which said settings associated with said processor and control means for said water temperature sensor means and said water heating control means include the elimination of stand-by heat loss prior to using said settings.
Claim 8
Dependent Claim
53 words
In a water heater control system as defined in claim 1 in which said settings associated with said processor and control means for said water temperature sensor means and said water heating control means include the elimination of stand-by heat loss as determined by certain previously recorded data prior to using said settings.
Claim 9
Dependent Claim
57 words
In a water control system as defined in claim 1 in which said settings associated with said processor and control means for said water temperature sensor means and said water heating control means include the elimination of stand-by heat loss as determined by the average of certain previous full time period recordings prior to using said settings.
Claim 10
Dependent Claim
68 words
In a water heater control system as defined in claim 1 in which said settings associated with said processor and control means for said water temperature sensor means and said water heating control means include the elimination of stand-by heat loss from said settings as determined by the average of three consecutive lowest full time period recordings during approximately a one week period prior to using said settings.
Claim 11
Dependent Claim
190 words
In a water heater control system as defined in claim 1 in which said water heater means of said water heater unit includes a hot water storage tank beyond a hot water heater with said hot water storage tank having a tank inlet connected to said hot water heater and a tank outlet connected to said water outlet means; in which said water temperature sensor means is a primary water temperature sensor means and is located generally between said tank outlet and said water outlet means; in which a secondary water temperature sensor means is located generally associated with said hot water storage tank generally toward said tank inlet; and in which said processor and control means regulates said primary water temperature sensor means to operate said water heater control means between on and off at particular temperatures and said secondary water temperature sensor means to operate said water heater control means between on and off at temperatures spaced below said particular temperatures, said secondary water sensor means operating said water heater control means to on despite said primary water sensor means operating to off as regulated by said temperatures.
Claim 12
Dependent Claim
208 words
In a water heater control system as defined in claim 1 in which said water heater means of said water heater unit includes a hot water storage tank beyond a hot water heater with said hot water storage tank having a tank inlet connected to said hot water heater and a tank outlet connected to said water outlet means; in which said water temperature sensor means is a primary water temperature sensor means and is located generally between said tank outlet and said water outlet means; in which a secondary water temperature sensor means is located generally associated with said hot water storage tank generally toward said tank inlet; and in which said processor and control means regulates said primary water temperature sensor means to operate said water heater control means between on and off at particular temperatures and said secondary water temperature sensor means to operate said water heater control means between on and off at temperatures spaced below said particular temperatures and determined by averaging the temperatures for said secondary water temperature sensor means over a preceding time limit, said secondary water sensor means operating said water heater control means to on despite said primary water sensor means operating to off as regulated by said temperatures.
Claim 13
Dependent Claim
211 words
In a water heater control system as defined in claim 1 in which said water heater means of said water heater unit includes a hot water storage tank beyond a hot water heater with said hot water storage tank having a tank inlet connected to said hot water heater and a tank outlet connected to said water outlet means; in which said water temperature sensor means is a primary water temperature sensor means and is located generally between said tank outlet and said water outlet means; in which a secondary water temperature sensor means is located generally associated with said hot water storage tank generally toward said tank inlet; and in which said processor and control means regulates said primary water temperature sensor means to operate said water heater control means between on and off at particular temperatures and said secondary water temperature sensor means to operate said water heater control means between on and off at temperatures spaced below said particular temperatures and determined by an average of temperatures of said secondary water temperature sensor means over the preceding twenty four hour period, said secondary water sensor means operating said water heater control means to on despite said primary water sensor means operating to off as regulated by said temperatures.
Claim 14
Dependent Claim
190 words
In a water heater control system as defined in claim 1 in which said water heater means of said water heater unit includes a hot water storage tank beyond a hot water heater with said hot water storage tank having a tank inlet connected to said hot water heater and a tank outlet connected to said water outlet means; in which said water temperature sensor means is a primary water temperature sensor means and is located generally between said tank outlet and said water outlet means; in which a secondary water temperature sensor means is located generally associated with said hot water storage tank generally at said tank inlet; and in which said processor and control means regulates said primary water temperature sensor means to operate said water heater control means between on and off at particular temperatures and said secondary water temperature sensor means to operate said water heater control means between on and off at temperatures spaced below said particular temperatures, said secondary water sensor means operating said water heater control means to on despite said primary water sensor means operating to off as regulated by said temperatures.
Claim 15
Dependent Claim
211 words
In a water heater control system as defined in claim 1 in which said water heater means of said water heater unit includes a hot water storage tank beyond a hot water heater with said hot water storage tank having a tank inlet connected to said hot water heater and a tank outlet connected to said water outlet means; in which said water temperature sensor means is a primary water temperature sensor means and is located generally between said tank outlet and said water outlet means; in which a secondary water temperature sensor means is located generally associated with said hot water storage tank generally at said tank inlet; and in which said processor and control means regulates said primary water temperature sensor means to operate said water heater control means between on and off at particular temperatures and said secondary water temperature sensor means to operate said water heater control means between on and off at temperatures spaced below said particular temperatures and determined by an average of temperatures of said secondary water temperature sensor means over the preceding twenty four hour period, said secondary water sensor means operating said water heater control means to on despite said primary water sensor means operating to off as regulated by said temperatures.
Claim 16
Dependent Claim
118 words
In a water heater control system as defined in claim 1 in which said settings associated with said processor and control means for said water temperature sensor means and said water heating control means are exactly according to the overall average of actual settings recorded in actual use during at least certain of those closely following said same one of said previous group of time periods and those closely approaching said present particular time period; and in which said settings associated with said processor and control means for said water temperature sensor means and said water heating control means include the elimination of stand-by heat loss as determined by certain previously recorded data prior to using said settings.
Claim 17
Dependent Claim
250 words
In a water heater control system as defined in claim 1 in which said settings associated with said processor and control means for said water temperature sensor means and said water heating control means include the elimination of stand-by heat loss as determined by certain previously recorded data prior to using said settings; in which said water heater means of said water heater unit includes a hot water storage tank beyond a hot water heater with said hot water storage tank having a tank inlet connected to said hot water heater and a tank outlet connected to said water outlet means; in which said water temperature sensor means is a primary water temperature sensor means and is located generally between said tank outlet and said water outlet means; in which a secondary water temperature sensor means is located generally associated with said hot water storage tank generally toward said tank inlet; and in which said processor and control means regulates said primary water temperature sensor means to operate said water heater control means between on and off at particular temperatures and said secondary water temperature sensor means to operate said water heater control means between on and off at temperatures spaced below said particular temperatures and determined by averaging the temperatures for said secondary water temperature sensor means over a preceding time limit, said secondary water sensor means operating said water heater control means to on despite said primary water sensor means operating to off as regulated by said temperatures.
Claim 18
Dependent Claim
225 words
In a water heater control system as defined in claim 1 in which said settings associated with said processor and control means for said water temperature sensor means and said water heating control means include the elimination of stand-by heat loss prior to using said settings; in which said water heater means of said water heater unit includes a hot water storage tank beyond a hot water heater with said hot water storage tank having a tank inlet connected to said hot water heater and a tank outlet connected to said water outlet means; in which said water temperature sensor means is a primary water temperature sensor means and is located generally between said tank outlet and said water outlet means; in which a secondary water temperature sensor means is located generally associated with said hot water storage tank generally toward said tank inlet; and in which said processor and control means regulates said primary water temperature sensor means to operate said water heater control means between on and off at particular temperatures and said secondary water temperature sensor means to operate said water heater control means between on and off at temperatures spaced below said particular temperatures, said secondary water sensor means operating said water heater control means to on despite said primary water sensor means operating to off as regulated by said temperatures.
Claim 19
Dependent Claim
306 words
In a water heater control system as defined in claim 1 in which said settings associated with said processor and control means for said water temperature sensor means and said water heating control means are exactly according to the larger of the actual settings recorded in actual use during that following said same one of a previous group of time periods and that directly preceding said present particular time period; in which said settings associated with said processor and control means for said water temperature sensor means and said water heating control means include the elimination of stand-by heat loss from said settings as determined by the average of three consecutive lowest full time period recordings during approximately a one week period prior to using said settings; in which said water heater means of said water heater unit includes a hot water storage tank beyond a hot water heater with said hot water storage tank having a tank inlet connected to said hot water heater and a tank outlet connected to said water outlet means; in which said water temperature sensor means is a primary water temperature sensor means and is located generally between said tank outlet and said water outlet means; in which a secondary water temperature sensor means is located generally associated with said hot water storage tank generally at said tank inlet; and in which said processor and control means regulates said primary water temperature sensor means to operate said water heater control means between on and off at particular temperatures and said secondary water temperature sensor means to operate said water heater control means between on and off at temperatures spaced below said particular temperatures, said secondary water sensor means operating said water heater control means to on despite said primary water sensor means operating to off as regulated by said temperatures.
Claim 20
Dependent Claim
266 words
In a method of constantly controlling the heating and use of hot water as provided by a water heating system; the steps of: beginning a particular time period which is one of a definite group of consecutive time periods and each is the repeat of the same one of a preceding group of time periods; at said beginning of said particular time period and to remain throughout said particular time period, setting said water heating system to produce hot water having a water temperature a determined amount above a minimum water temperature by use of a water heater over a portion of the total time less than said total time by choosing at least certain of the average of exact recorded temperatures as actually used on a total period averaged basis of the last previous of said particular time period and those close to said previous time period and those closely approaching said present particular time period; throughout said particular time period, recording the actual temperatures of the water being used and the portion of the water heater that is used to create said temperatures; continuing in the same manner in order with following of particular time periods until the end of said definite group of consecutive time periods; starting on a next group of time periods and following with other groups of time periods in order and always originally at the beginning of each time period, setting said water temperature from actual prior use in the same manner and then recording the actual water temperatures and the portions of the water heater that is used.
Claim 21
Dependent Claim
266 words
In a method of constantly controlling the heating and use of hot water as provided by a water heating system; the steps of: beginning a particular time period which is one of a definite group of consecutive time periods and each is the repeat of the same one of a preceding group of time periods; at said beginning of said particular time period and to remain throughout said particular time period, setting said water heating system to produce hot water having a water temperature a determined amount above a minimum water temperature by use of a water heater over a portion of the total time less than said total time by choosing at least certain of the average of exact recorded temperatures as actually used on a total period averaged basis of the last previous of said particular time period and those close to said previous time period and those closely approaching said present particular time period; throughout said particular time period, recording the actual temperatures of the water being used and the portion of the water heater that is used to create said temperatures; continuing in the same manner in order with following of particular time periods until the end of said definite group of consecutive time periods; starting on a next group of time periods and following with other groups of time periods in order and always originally at the beginning of each time period, setting said water temperature from actual prior use in the same manner and then recording the actual water temperatures and the portions of the water heater that is used.
Claim 22
Dependent Claim
67 words
In a method as defined in claim 19 in which said step of at said beginning of said particular time period and to remain throughout said particular time period includes choosing at least certain of the average of exact recorded temperatures as actually used on a total period averaged basis of those close to said previous time period and those closely approaching said present particular time period.
Claim 23
Dependent Claim
67 words
In a method as defined in claim 19 in which said step of at said beginning of said particular time period and to remain throughout said particular time period includes choosing at least certain of the average exact recorded temperatures as actually used on a total period averaged basis of the two after said previous time period and the two exactly preceding said present particular time period.
Claim 24
Dependent Claim
64 words
In a method as defined in claim 19 in which said step of at said beginning of said particular time period and to remain throughout said particular time period includes choosing the larger of the exact recorded temperatures as actually used on a total period average basis of the two following said previous time period and the two approaching said present particular time period.
Claim 25
Dependent Claim
70 words
In a method as defined in claim 19 in which said step of at said beginning of said particular time period and to remain throughout said particular time period includes choosing the larger of the average of exact recorded temperatures as actually used on a total period average basis taken from the single time period following said previous time period and the time period approaching said present particular time period.
Claim 26
Dependent Claim
44 words
In a method as defined in claim 19 in which said step of at said beginning of said particular time period and to remain throughout said particular time period, setting said water heater system includes the first elimination of a general stand-by heat loss.
Claim 27
Dependent Claim
56 words
In a method as defined in claim 19 in which said step of at said beginning of said particular time period and to remain throughout said particular time period, setting said water heater system includes the first elimination of a general stand-by heat loss, said general stand-by heat loss being calculated from certain previously recorded data.
Claim 28
Dependent Claim
68 words
In a method as defined in claim 19 in which said step of at said beginning of said particular time period and to remain throughout said particular time period, setting said water heater system includes the first elimination of a general stand-by heat loss, said general stand-by heat loss being calculated by using the total heat for an average of the heat used in certain previous time periods.
Claim 29
Dependent Claim
75 words
In a method as defined in claim 19 in which said step of at said beginning of said particular time period and to remain trhoughout said particular time period, setting said water heater system includes the first elimination of a general stand-by heat loss, said general stand-by heat loss being calculated by taking the average of the heat used above said minimum temperature in three consecutive lowest previous time periods over a one week period.
Claim 30
Dependent Claim
92 words
In a method as defined in claim 19 in which said step of throughout said particular time period, recording the actual temperatures includes additionally noting the temperature of the water at an earlier point toward the beginning of a water storage tank and at any time said water temperature drops below a temperature spaced below said temperature being recorded, initiating said water heating system to heat and record said heating until said water temperature is above said lower temperature without regard to the temperature of the water being recorded and actually used.
Claim 31
Dependent Claim
111 words
In a method as defined in claim 19 in which said step of throughout said particular time period, recording the actual temperatures includes additionally noting the temperature of the water at an earlier point toward the beginning of a water storage tank and at any time said water temperature drops below a temperature spaced below said temperature being recorded, initiating said water heating system to heat and record said heating until said water temperature is above said lower temperature without regard to the temperature of the water being recorded and actually used, said temperature spaced below said temperature being recorded being calculated from data from actual use of previous time periods.
Claim 32
Dependent Claim
126 words
In a method as defined in claim 19 in which said step of throughout said particular time period, recording the actual temperatures includes additionally noting the temperature of the water at an earlier point toward the beginning of a water storage tank and at any time said water temperature drops below a temperature spaced below said temperature being recorded, initiating said water heating system to heat and record said heating until said water temperature is above said lower temperature without regard to the temperature of the water being recorded and actually used, said temperature spaced below said temperature being recorded being calculated from an average of that same temperature for the actual use of previous time periods over a twenty four hour period of time periods.
Claim 33
Dependent Claim
93 words
In a method as defined in claim 19 in which said step of throughout said particular time period, recording the actual temperature includes additionally noting the temperature of the water at an earlier point generally at the beginning of a water storage tank and at any time said water temperature drops below a temperature spaced below said temperature being recorded, initiating said water heating system to heat and record said heating until said water temperature is above said lower temperature without regard to the temperature of the water being recorded and actually used.
Claim 34
Dependent Claim
128 words
In a method as defined in claim 19 in which said step of at said beginning of said particular time period and to remain throughout said particular time period, setting said water heater system includes the first elimination of a general stand-by heat loss; in which said step of throughout said particular time period, recording the actual temperatures includes additionally noting the temperature of the water at an earlier point toward the beginning of a water storage tank and at any time said water temperature drops below a temperature spaced below said temperature being recorded, initiating said water heating system to heat and record said heating until said water temperature is above said lower temperature without regard to the temperature of the water being recorded and actually used.
Claim 35
Dependent Claim
230 words
In a method as defined in claim 19 in which said step of at said beginning of said particular time period and to remain throughout said particular time period includes choosing at least certain of the average of exact recorded temperatures as actually used on a total period averaged basis of those close to said previous time period and those closely approaching said present particular time period; in which said step of at said beginning of said particular time period and to remain throughout said particular time period, setting said water heater system includes the first elimination of a general stand-by heat loss, said general stand-by heat loss being calculated by using the total heat for an average of the heat used in certain previous time periods; in which said step of throughout said particular time period, recording the actual temperatures includes additionally noting the temperature of the water at an earlier point toward the beginning of a water storage tank and at any time said water temperature drops below a temperature spaced below said temperature being recorded, initiating said water heating system to heat and record said heating until said water temperature is above said lower temperature without regard to the temperature of the water being recorded and actually used, said temperature spaced below said temperature being recorded being calculated from data from actual use of previous time periods.
Claim 36
Dependent Claim
230 words
In a method as defined in claim 19 in which said step of at said beginning of said particular time period and to remain throughout said particular time period includes choosing at least certain of the average exact recorded temperatures as actually used on a total period averaged basis of the two after said previous time period and the two exactly preceding said present particular time period; in which said step of at said beginning of said particular time period and to remain throughout said particular time period, setting said water heater system includes the first elimination of a general stand-by heat loss, said general stand-by heat loss being calculated by using the total heat for an average of the heat used in certain previous time periods; in which said step of throughout said particular time period, recording the actual temperatures includes additionally noting the temperature of the water at an earlier point toward the beginning of a water storage tank and at any time said water temperature drops below a temperature spaced below said temperature being recorded, initiating said water heating system to heat and record said heating until said water temperature is above said lower temperature without regard to the temperature of the water being recorded and actually used, said temperature spaced below said temperature being recorded being calculated from data from actual use of previous time periods.
Claim 37
Dependent Claim
242 words
In a method as defined in claim 19 in which said step of at said beginning of said particular time period and to remain throughout said particular time period includes choosing the larger of the exact recorded temperatures as actually used on a total period average basis of the two following said previous time period and the two approaching said present particular time period; in which said step of at said beginning of said particular time period and to remain throughout said particular time period, setting said water heater system includes the first elimination of a general stand-by heat loss, said general stand-by heat loss being calculated by using the total heat for an average of the heat used in certain previous time periods; in which said step of throughout said particular time period, recording the actual temperatures includes additionally noting the temperature of the water at an earlier point toward the beginning of a water storage tank and at any time said water temperature drops below a temperature spaced below said temperature being recorded, initiating said water heating system to heat and record said heating until said water temperature is above said lower temperature without regard to the temperature of the water being recorded and actually used, said temperature spaced below said temperature being recorded being calculated from an average of that same temperature for the actual use of previous time periods over a twenty four hour period of time periods.
Claim 38
Dependent Claim
256 words
In a method as defined in claim 19 in which said step of at said beginning of said particular time period and to remain throughout said particular time period includes choosing the larger of the average of exact recorded temperatures as actually used on a total period average basis taken from the single time period following said previous time period and the time period approaching said present particular time period; in which said step of at said beginning of said particular time period and to remain throughout said particular time period, setting said water heater system includes the first elimination of a general stand-by heat loss, said general stand-by heat loss being calculated by taking the average of the heat used above said minimum temperature in three consecutive lowest previous time periods over a one week period; in which said step of throughout said particular time period, recording the actual temperatures includes additionally noting the temperature of the water at an earlier point generally at the beginning of a water storage tank and at any time said water temperature drops below a temperature spaced below said temperature being recorded, initiating said water heating system to heat and record said heating until said water temperature is above said lower temperature without regard to the temperature of the water being recorded and actually used, said temperature spaced below said temperature being recorded being calculated from an average of that same temperature for the actual use of previous time periods over a twenty four hour period of time periods.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-03 | 1990-05-05 | 1990-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-03 | 1994-05-05 | 1994-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-03 | 1998-05-05 | 1998-11-04 | $7700.00 | Window Closed / Lapsed |