Patent US3823728A successfully refreshed from Google Patents.
US3823728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for liquid treatment
Assignee: Individual
•
Filing: 1972-12-29
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Granted: 1974-07-16
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Expires: 1992-12-29
Abstract
Abstract A system for adding material to a liquid on variable demand is controlled by a switch responsive to liquid pressure for operating the material-adding means whenever a pressure drop shows that the liquid is withdrawn. A delay means operates the material adding means for a pre-determined interval after the switch changes state in response to stoppage of the withdrawal of the liquid. Also, a valve preferably prevents liquid entry into the system except during liquid withdrawal. The material-adding means is then activated on each liquid withdrawal and for a fixed interval thereafter, and no liquid enters the system without having added material. The system can also be operated without a delay means when the input is controlled so no input can occur except when the system is operating.
Inventors
- 👤 W Burris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:49
CPC Classifications
G; G05; G05D; G05D11/00; G05D11/02; G05D11/13; G05D11/131; B; B01; B01J; B01J4/00; B01J4/02; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2499; Y10T137/2514; Y10T137/2521; Y10T137/2529; Y10T137/2534
Claims Analysis
Total Claims: 65
Claim 1
Independent Claim
179 words
In a system for supplying pressurized liquid on variable demand including means for adding material to said liquid as a function of said variable demand, an improved control system for said material adding means, said control system comprising: a. switch means responsive to and activated by liquid pressure in a region of said system; b. said switch means being arranged to change state at a pressure change value substantially above atmospheric pressure and related to withdrawal of said liquid from said system; c. said switch means being arranged for operating said materialadding means whenever said switch means changes state in response to said pressure in said region falling below said pressure change value; d. delay means for continuing said operating of said material adding means for a pre-determined interval after said switch means changes state in response to said pressure in said region rising above said pressure change value; and e. said pressure region is downstream from the input to said system and said pressure change value is related to the pressure of said liquid input in said system.
Claim 2
Dependent Claim
179 words
In a system for supplying pressurized liquid on variable demand including means for adding material to said liquid as a function of said variable demand, an improved control system for said material adding means, said control system comprising: a. switch means responsive to and activated by liquid pressure in a region of said system; b. said switch means being arranged to change state at a pressure change value substantially above atmospheric pressure and related to withdrawal of said liquid from said system; c. said switch means being arranged for operating said materialadding means whenever said switch means changes state in response to said pressure in said region falling below said pressure change value; d. delay means for continuing said operating of said material adding means for a pre-determined interval after said switch means changes state in response to said pressure in said region rising above said pressure change value; and e. said pressure region is downstream from the input to said system and said pressure change value is related to the pressure of said liquid input in said system.
Claim 3
Dependent Claim
27 words
The control system of claim 1 wHerein said switch means comprises an electric switch responsive to the pressure difference between said pressure region and said liquid input.
Claim 4
Dependent Claim
27 words
The control system of claim 2 including a valve normally closing said input, and means for opening said valve during said operation of said material adding means.
Claim 5
Dependent Claim
23 words
The control system of claim 3 wherein said added material is a gas and including vent means for venting gas from said liquid.
Claim 6
Dependent Claim
16 words
The control system of claim 1 including means for regulating the pressure of said input liquid.
Claim 7
Dependent Claim
56 words
The control system of claim 1 wherein said switch means includes a pair of pressure-sensitive switches connected in series and arranged respectively in said input and said pressure region for operating said material adding means whenever said input pressure is above a pre-determined value and said pressure in said region is below said pressure change value.
Claim 8
Dependent Claim
35 words
The control system of claim 1 including a valve normally closing said input, and said switch means being arranged for opening said valve whenever said pressure in said region is below said pressure change value.
Claim 9
Dependent Claim
27 words
The control system of claim 1 including a valve normally closing said input, and means for opening said valve during said operation of said material adding means.
Claim 10
Dependent Claim
27 words
The control system of claim 8 wherein said switch means comprises an electric switch responsive to the pressure difference between said pressure region and said liquid input.
Claim 11
Dependent Claim
23 words
The control system of claim 8 wherein said added material is a gas and including vent means for venting gas from said liquid.
Claim 12
Dependent Claim
31 words
The control system of claim 10 wherein said vent means includes a reservoir of a gas and said liquid in communication with a surface of said liquid in said pressure region.
Claim 13
Dependent Claim
19 words
The control system of claim 11 wherein said vent valve includes a float-controlled valve and a pressure relief valve.
Claim 14
Dependent Claim
14 words
The control system of claim 10 wherein said vent means includes a vent valve.
Claim 15
Dependent Claim
12 words
The control system of claim 13 wherein said vent valve is float-controlled.
Claim 16
Dependent Claim
29 words
The control system of claim 14 wherein said vent means includes delay means for holding said input valve open for a pre-determined interval after said material-adding means stops operating.
Claim 17
Dependent Claim
30 words
The control system of claim 14 including a normally closed valve downstream from said float-controlled valve and means for opening said downstream valve during said operation of said material-adding means.
Claim 18
Dependent Claim
33 words
The control system of claim 10 wherein said vent means includes a vent valve and an electric controlled valve downstream from said vent valve and closed when said material-adding means is not operating.
Claim 19
Dependent Claim
16 words
The control system of claim 8 including means for regulating the pressure of said input liquid.
Claim 20
Dependent Claim
55 words
The control system of claim 8 wherein said switch means includes a pair of pressure-sensitive switches connected in series and arranged respectively in said input and said pressure region for operating said material-adding means whenever said input pressure is above a pre-determined value and said pressure in said region is below said pressure change value.
Claim 21
Dependent Claim
16 words
The control system of claim 19 including a float-controlled valve for venting gas from said system.
Claim 22
Dependent Claim
24 words
The control system of claim 8 including delay means for holding said valve open for a pre-determined interval after said material-adding means stops operating.
Claim 23
Dependent Claim
38 words
The control system of claim 1 wherein said switch means includes an hydraulically actuated valve in said input arranged to open when said liquid is withdrawn from said system, and an electric switch operated by said hydraulic valve.
Claim 24
Dependent Claim
161 words
In a system for supplying pressurized liquid on variable demand including means for adding material to said liquid as a function of said variable demand, an improved control system for said material adding means, said control system comprising: a. switch means responsive to and activated by liquid pressure in a region of said system; b. said switCh means being arranged to change state at a pressure change value substantially above atmospheric pressure and related to withdrawal of said liquid from said system; c. said switch means being arranged for operating said material-adding means whenever said switch means changes state in response to said pressure in said region falling below said pressure change value; d. delay means for continuing said operating of said material adding means for a pre-determined interval after said switch means changes state in response to said pressure in said region rising above said pressure change value; and e. said pressure region is a variable depth of said liquid.
Claim 25
Dependent Claim
161 words
In a system for supplying pressurized liquid on variable demand including means for adding material to said liquid as a function of said variable demand, an improved control system for said material adding means, said control system comprising: a. switch means responsive to and activated by liquid pressure in a region of said system; b. said switCh means being arranged to change state at a pressure change value substantially above atmospheric pressure and related to withdrawal of said liquid from said system; c. said switch means being arranged for operating said material-adding means whenever said switch means changes state in response to said pressure in said region falling below said pressure change value; d. delay means for continuing said operating of said material adding means for a pre-determined interval after said switch means changes state in response to said pressure in said region rising above said pressure change value; and e. said pressure region is a variable depth of said liquid.
Claim 26
Dependent Claim
57 words
The control system of claim 23 wherein liquid pressure at the bottom of said variable depth of said liquid varies as a direct multiple of said variable depth, and said switch means responds to said liquid pressure at said bottom of said variable depth by monitoring said variable depth with a float movable with said variable depth.
Claim 27
Dependent Claim
38 words
The control system of claim 24 including means for controlling the input of said liquid to said system, and means for operating said input control for allowing input of said liquid only during operation of said material-adding means.
Claim 28
Dependent Claim
38 words
The control system of claim 25 wherein said input control means includes a pump for supplying said liquid to said system, and means for operating said pump in response to said changes of state of said switch means.
Claim 29
Dependent Claim
34 words
The control system of claim 25 wherein said input control includes a valve normally closing said input, and means for opening said valve in response to said changes of state of said switch means.
Claim 30
Dependent Claim
22 words
The control system of claim 24 including a vent valve having a control float operating on said variable depth of said liquid.
Claim 31
Dependent Claim
38 words
The control system of claim 23 including means for controlling the input of said liquid to said system, and means for operating said input control for allowing input of said liquid only during operation of said material-adding means.
Claim 32
Dependent Claim
12 words
The control system of claim 29 including a pressure relief vent valve.
Claim 33
Dependent Claim
23 words
The control system of claim 29 wherein said added material is a gas and including vent means for venting gas from said liquid.
Claim 34
Dependent Claim
38 words
The control system of claim 31 wherein said input control means includes a pump for supplying said liquid to said system, and means for operating said pump in response to said changes of state of said switch means.
Claim 35
Dependent Claim
35 words
The control system of claim 31 wherein said input control means includes a valve normally closing said input, and means for opening said valve in response to said changes of state of said switch means.
Claim 36
Dependent Claim
14 words
The control system of claim 31 wherein said vent means includes a vent valve.
Claim 37
Dependent Claim
13 words
The control system of claim 34 wherein said vent valve is float controlled.
Claim 38
Dependent Claim
27 words
The control system of claim 35 including a normally closed valve downstream from said float-controlled vent valve and opened during said operation of said material adding means.
Claim 39
Dependent Claim
27 words
The control system of claim 35 including a reservoir of a gas in said liquid in communication with the surface of said variable depth of said liquid.
Claim 40
Dependent Claim
25 words
The control system of claim 35 including delay means for holding said input valve open for a pre-determined interval after said material-adding means stops operating.
Claim 41
Dependent Claim
11 words
The control system of claim 35 including a pressure relief valve.
Claim 42
Dependent Claim
23 words
The control system of claim 23 wherein said added material is a gas and including vent means for venting gas from said liquid.
Claim 43
Dependent Claim
22 words
The control syytem of claim 23 wherein said switch means includes a pressure differential switch for controlling said depth of said liquid.
Claim 44
Dependent Claim
38 words
The control system of claim 41 including means for controlling the input of said liquid to said system, and means for operating said input control for allowing input of said liquid only during operation of said material-adding means.
Claim 45
Dependent Claim
38 words
The control system of claim 42 wherein said input control means incluDes a pump for supplying said liquid to said system, and means for operating said pump in response to said changes of state of said switch means.
Claim 46
Dependent Claim
35 words
The control system of claim 42 wherein said input control means includes a valve normally closing said input, and means for opening said valve in response to said changes of state of said switch means.
Claim 47
Dependent Claim
170 words
In a system for supplying pressurized liquid on variable demand including means for adding material to a contained volume of said liquid as a function of said variable demand, an improved control system for said material-adding means, said control system comprising: a. switch means responsive to and activated by liquid pressure in a region of said system; b. said switch means being arranged to change state at a pressure change value substantially above atmospheric pressure and related to withdrawal of said liquid from said system; c. said switch means being arranged for operating said material adding means to add said material to said contained volume of said liquid whenever said switch means changes state in response to said pressure in said region falling below said pressure change value; and d. means cooperable with said switch means for allowing said liquid to enter said contained volume when said material adding means is operating and for preventing said liquid from entering said contained volume when said material adding means is not operating.
Claim 48
Dependent Claim
170 words
In a system for supplying pressurized liquid on variable demand including means for adding material to a contained volume of said liquid as a function of said variable demand, an improved control system for said material-adding means, said control system comprising: a. switch means responsive to and activated by liquid pressure in a region of said system; b. said switch means being arranged to change state at a pressure change value substantially above atmospheric pressure and related to withdrawal of said liquid from said system; c. said switch means being arranged for operating said material adding means to add said material to said contained volume of said liquid whenever said switch means changes state in response to said pressure in said region falling below said pressure change value; and d. means cooperable with said switch means for allowing said liquid to enter said contained volume when said material adding means is operating and for preventing said liquid from entering said contained volume when said material adding means is not operating.
Claim 49
Dependent Claim
25 words
The control system of claim 45 wherein said cooperable means includes a valve in the input to said system and responsive to said switch means.
Claim 50
Dependent Claim
69 words
The control system of claim 46 wherein said pressure region is a variable depth of said liquid with said liquid pressure at the bottom of said variable depth of said liquid varying as a direct multiple of said variable depth, and said switch means responds to said liquid pressure at said bottom of said variable depth by monitoring said variable depth with a float movable with said variable depth.
Claim 51
Dependent Claim
24 words
The control system of claim 46 wherein said pressure region is downstream from the input to said system, and said switch means is pressure-responsive.
Claim 52
Dependent Claim
55 words
The control system of claim 48 wherein said switch means includes a pair of pressure-sensitive switches connected in series and arranged respectively in said input and said pressure region for operating said material adding means whenever said input pressure is above a pre-determined value and said pressure in said region is below said pressure-change value.
Claim 53
Dependent Claim
27 words
The control system of claim 48 wherein said switch means comprises an electric switch responsive to the pressure difference between said pressure region and said liquid input.
Claim 54
Dependent Claim
13 words
The control system of claim 48 including a pressure regulator in said input.
Claim 55
Dependent Claim
38 words
The control system of claim 45 including a pump for supplying said liquid to said system, and wherein said cooperable means is arranged for operating said pump in response to said changes of state of said switch means.
Claim 56
Dependent Claim
37 words
The control system of claim 52 wherein said pressure region is a variable depth of said liquid, said material added to said liquid is a gas, and wherein vent means is arranged above said depth of liquid.
Claim 57
Dependent Claim
29 words
The control system of claim 53 wherein said switch means includes a float movable with said variable depth of said liquid, and said vent means includes a pressure-responsive valve.
Claim 58
Dependent Claim
25 words
The control system of claim 52 wherein said pressure region is downstream from the input to said system and said switch means is pressure responsive.
Claim 59
Dependent Claim
13 words
The control system of claim 55 including pressure regulating means in said input.
Claim 60
Dependent Claim
26 words
The control system of claim 56 including a normally-closed, electric-controlled valve downstream from said float-controlled valve and opened during said operation of said material adding means.
Claim 61
Dependent Claim
23 words
The control system of claim 45 wherein said added material is a gas, and including vent means for venting gas from said liquid.
Claim 62
Dependent Claim
15 words
The control system of claim 58 wherein said vent means is a float controlled valve.
Claim 63
Dependent Claim
14 words
The control system of claim 58 wherein said vent means is an electro-mechanical valve.
Claim 64
Dependent Claim
17 words
The control system of claim 60 including a pressure relief valve in series with said electro-mechanical valve.
Claim 65
Dependent Claim
15 words
The control system of claim 58 wherein said vent means is a pressure relief valve.
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |