US3709289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating and cooling control system
Assignee: Weather Rite Inc
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Filing: 1971-03-30
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Granted: 1973-01-09
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Expires: 1991-03-30
Abstract
Abstract A control system for a heating and cooling system in which the amount of heating and the amount of cooling are changed in incremental stages in response to a signal received at timed intervals from an electronic clock. A proportional thermostat calls for either heating or cooling and also controls the rate of the electronic clock.
Inventors
- 👤 R Weatherston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:02
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/1917
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
140 words
A control system for a heating and cooling system comprising in combination; incrementally adjustable heating and cooling means; first and second logic means connected to said adjustable heating and cooling means respectively both operable when activated to call for incrementally more heat and incrementally more cooling; a proportional thermostat connected to said first and second logic means operable to select between said first and second logic means to produce more heating or more cooling; an electronic clock connected to said logic means operable to activate the logic means at periodic intervals; an electronic feedback means connecting said thermostat and said electronic clock operable to accelerate said electronic clock in response to a greater differential between the signals to said first and second logic means from said thermostat which differential represents the difference between the actual temperature and the desired temperature.
Claim 2
Dependent Claim
140 words
A control system for a heating and cooling system comprising in combination; incrementally adjustable heating and cooling means; first and second logic means connected to said adjustable heating and cooling means respectively both operable when activated to call for incrementally more heat and incrementally more cooling; a proportional thermostat connected to said first and second logic means operable to select between said first and second logic means to produce more heating or more cooling; an electronic clock connected to said logic means operable to activate the logic means at periodic intervals; an electronic feedback means connecting said thermostat and said electronic clock operable to accelerate said electronic clock in response to a greater differential between the signals to said first and second logic means from said thermostat which differential represents the difference between the actual temperature and the desired temperature.
Claim 3
Dependent Claim
20 words
The apparatus of claim 1 wherein the signals from said thermostat comprise voltages produced by a temperature varied bridge circuit.
Claim 4
Dependent Claim
34 words
The apparatus of claim 2 in which said feedback means comprises electronic gates connected to receive the voltage signals from said thermostat and accelerate said clock in response to predetermined differentials between said voltages.
Claim 5
Dependent Claim
23 words
The apparatus of claim 3 including means to inhibit said logic means from calling for more heating when maximum heating is being applied.
Claim 6
Dependent Claim
23 words
The apparatus of claim 3 including means to inhibit said logic means from calling for more cooling when maximum cooling is being applied.
Claim 7
Dependent Claim
24 words
The apparatus of claim 3 including means to inhibit said logic means from calling for more heating in response to a predetermined external condition.
Claim 8
Dependent Claim
24 words
The apparatus of claim 3 including means to inhibit said logic means from calling for more cooling in response to a predetermined external condition.
References Cited (Backward Citations)
US3305000A
Cited
US3645697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |