US3709769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control for air-conditioning apparatus
Assignee: Carrier Corp
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Filing: 1971-04-30
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Granted: 1973-01-09
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Expires: 1991-04-30
Abstract
Abstract A control arrangement for an air-conditioning system adapted to serve a plurality of zones, a master control being provided in the control arrangement to energize and deenergize the zone thermostats, the master control energizing the individual zone thermostats in response to a preselected temperature variation from the zone thermostat set point in a representative zone, deenergization of the zone thermostats by the master control allowing the temperature in each of the zones to increase or decrease from the zone thermostat set point and reduce the load on the air-conditioning system for weekend and nighttime operation.
Inventors
- 👤 R Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:18
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/044; F24F3/048; F24F3/052; F24F3/0527
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
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 |