US3621669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioner control
Assignee: Whirlpool Corp
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Filing: 1969-11-03
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Granted: 1971-11-23
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Expires: 1989-11-03
Abstract
Abstract A CONTROL FOR USE IN AN AIR CONDITIONER OR THE LIKE WHEREIN MEANS ARE PROVIDED FOR INTERMITTENTLY ENERGIZING THE AIR CIRCULATING FAN SO AS TO CAUSE THE TEMPERATURE OF THE AIR SENSED BY THE CONTROL THERMOSTAT TO CORRESPOND MORE DIRECTLY TO THE TEMPERATURE OF THE ROOM AIR. F OR THIS PURPOSE A LOW WATTAGE HEATER IS ASSOCIATED WITH THE THERMOSTAT TO HEAT THE THERMOS OR HEAT THE AIR ADJACENT THE THERMOSTAT WHEN THE FAN IS DE-ENERGIZED AND THEREBY CAUSE THE TEMPERATURE SENSED BY THE THERMOSTAT TO REACH A LEVEL SUFFICIENT TO EFFECT THE INTERMITTENT OPERATION OF THE FAN.
Inventors
- 👤 Duane C Nichols
- 👤 Edwin M Marks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:22
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/30; F24F11/70; F24F11/72; F24F11/74; F24F11/755
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |