US3580501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Humidity and temperature sensing and control circuit
Assignee: Individual
•
Filing: 1969-03-25
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Granted: 1971-05-25
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Expires: 1989-03-25
Abstract
Abstract An electronic relative humidity sensing and control circuit having outdoor temperature reset is described. A circuit having temperature and humidity sensors arranged in a bridge circuit for providing control signals to a transistor amplifier is shown for controlling humidity-determining equipment. Additional bridge circuitry is also shown for automatically sensing an controlling heating and air conditioning equipment in response to sensed changes in outdoor temperature.
Inventors
- 👤 Donovan P Streed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:48
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/56; F; F24; F24F; F24F11/00; F24F11/88; G05; G05D; G05D22/00; G05D22/02; F24F11/30; F24F2110/00; F24F2110/10; F24F2110/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
241 words
Environmental control apparatus comprising: a. bridge means including outdoor condition responsive means in a first leg for responding to predetermined outside conditions and indoor condition responsive means in a second leg for responding to predetermined inside conditions, said bridge means further including bridge output means for providing an error signal indicative of an unbalanced condition in said bridge mean; b. amplifier means coupled to said bridge output means for providing a control signal in response to the presence of said error signal, and a second control signal in response to the absence of said error signal; c. condition determining control means coupled to said amplifier means for alternatively activating and deactivating condition determining apparatus in response to said first and second control signals; d. said outdoor condition responsive means including temperature sensing means and said indoor condition responsive means including relative humidity sensing means; and, e. indoor temperature controlling means coupled to said bridge means for providing a further error signal when the predetermined null of said bridge means and said indoor temperature controlling means is unbalanced; further amplifier means coupled to said indoor temperature controlling means for providing first temperature control signals in response to the presence of said further error signals, and second temperature control signals in response to the absence of said further error signal; and indoor temperature determining control means for alternatively activating and deactivating temperature determining apparatus in response to said first and second temperature signals.
Claim 2
Dependent Claim
241 words
Environmental control apparatus comprising: a. bridge means including outdoor condition responsive means in a first leg for responding to predetermined outside conditions and indoor condition responsive means in a second leg for responding to predetermined inside conditions, said bridge means further including bridge output means for providing an error signal indicative of an unbalanced condition in said bridge mean; b. amplifier means coupled to said bridge output means for providing a control signal in response to the presence of said error signal, and a second control signal in response to the absence of said error signal; c. condition determining control means coupled to said amplifier means for alternatively activating and deactivating condition determining apparatus in response to said first and second control signals; d. said outdoor condition responsive means including temperature sensing means and said indoor condition responsive means including relative humidity sensing means; and, e. indoor temperature controlling means coupled to said bridge means for providing a further error signal when the predetermined null of said bridge means and said indoor temperature controlling means is unbalanced; further amplifier means coupled to said indoor temperature controlling means for providing first temperature control signals in response to the presence of said further error signals, and second temperature control signals in response to the absence of said further error signal; and indoor temperature determining control means for alternatively activating and deactivating temperature determining apparatus in response to said first and second temperature signals.
Claim 3
Dependent Claim
31 words
Environmental control apparatus as in claim 1 wherein said indoor temperature controlling means includes temperature selection means for selecting a temperature in a predetermined range of temperatures by adjusting said null.
Claim 4
Dependent Claim
39 words
Environmental control apparatus as in claim 2 wherein said indoor condition responsive means is operative in a first predetermined range of outdoor temperatures, and said indoor temperature controlling means is operative in a second predetermined range of outdoor temperatures.
Claim 5
Dependent Claim
196 words
Environmental control apparatus comprising: a. bridge means including outdoor temperature responsive means in a first leg for conducting first current in amounts determined by the outdoor temperature and indoor relative humidity sensing means in a second leg for conducting second current in amounts determined by the indoor relative humidity, said bridge means including bridge output means for providing an error signal indicative of an unbalanced condition in said bridge means; b. transistor amplifier means coupled to said bridge output means for providing first control signals in response to the presence of said error signals and second control signals in response to the absence of said error signals; c. silicon controlled rectifier means having a control electrode coupled to said transistor amplifier means for conducting in a first mode in response to said first control signals and in a second mode in response to said second control signals; and d. relay means coupled to said silicon controlled rectifier means for operating in a first manner in response to said conduction in a first mode and operating in a second manner in response to said conduction in said second mode thereby being capable of controlling humidity controlling equipment.
Claim 6
Dependent Claim
196 words
Environmental control apparatus comprising: a. bridge means including outdoor temperature responsive means in a first leg for conducting first current in amounts determined by the outdoor temperature and indoor relative humidity sensing means in a second leg for conducting second current in amounts determined by the indoor relative humidity, said bridge means including bridge output means for providing an error signal indicative of an unbalanced condition in said bridge means; b. transistor amplifier means coupled to said bridge output means for providing first control signals in response to the presence of said error signals and second control signals in response to the absence of said error signals; c. silicon controlled rectifier means having a control electrode coupled to said transistor amplifier means for conducting in a first mode in response to said first control signals and in a second mode in response to said second control signals; and d. relay means coupled to said silicon controlled rectifier means for operating in a first manner in response to said conduction in a first mode and operating in a second manner in response to said conduction in said second mode thereby being capable of controlling humidity controlling equipment.
Claim 7
Dependent Claim
56 words
Environmental control apparatus as in claim 4 wherein said outdoor temperature responsive means exhibits a characteristic of decreasing resistance to conduction of said first current in response to rising outdoor temperature and said indoor relative humidity sensing means exhibits a characteristic of decreasing resistance to conduction of said second current in response to rising relative humidity.
Claim 8
Dependent Claim
185 words
Environmental control apparatus as in claim 5 and further including indoor temperature control means having voltage divider means coupled to said bridge means for cooperating with said temperature responsive means for providing a further error signal when the predetermined null of said bridge means and said indoor temperature control means is unbalanced, further transistor amplifier means coupled to said voltage divider means for providing first temperature control signals in response to the presence of said further error signal and second temperature control signals in response to the absence of said further error signal; further silicon controlled rectifier means having a control electrode coupled to said further transistor amplifier means for conducting in a first mode in response to said first temperature control signals and in a second mode in response to said second temperature control signals; and relay means coupled to said further silicon controlled rectifier means for operating in a first manner in response to said conduction in a first mode and operating in a second manner in response to said conduction in said second mode, thereby being capable of controlling temperature determining equipment.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |