Patent US3133424A successfully refreshed from Google Patents.
US3133424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controls for heat pumps having air exposed outdoor air coils
Assignee: Westinghouse Electric Corp
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Filing: 1962-11-29
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Granted: 1964-05-19
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Expires: 1982-11-29
Abstract
No abstract record available.
Inventors
- 👤 Robert T Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:47
CPC Classifications
F; F25; F25B; F25B41/00; F25B13/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
107 words
A HEAT PUMP COMPRISING AN INDOOR AIR COIL, AN OUTDOOR AIR COIL, A REFRIGERANT COMPRESSOR, A REFRIGERANT REVERSAL VALVE CONNECTED TO THE SUCTION AND DISCHARGE SIDES OF SAID COMPRESSOR AND TO SAID COILS, MEANS INCLUDING A LIQUID PUMP AND FIRST REFRIGERANT EXPANSION MEANS IN SERIES FOR CONNECTING SAID OUTDOOR AIR COIL TO SAID INDOOR AIR COIL, BY-PASS TUBING INCLUDING A CHECK-VALVE CONNECTED ACROSS SAID PUMP, MEANS FOR DRIVING SAID PUMP, MEANS INCLUDING SECOND REFRIGERANT EXPANSION MEANS FOR CONNECTING SAID INDOOR AIR COIL TO SAID OUTDOOR AIR COIL, MEANS FOR ADJUSTING SAID REVERSAL VALVE TO ROUTE REFRIGERANT FROM SAID COMPRESSOR DIRECTLY TO SAID OUTDOOR AIR COIL, OR TO
References Cited (Backward Citations)
US2949750A
Cited
US3060698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-19 | 1967-11-18 | 1968-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-19 | 1971-11-18 | 1972-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-19 | 1975-11-18 | 1976-05-19 | $7700.00 | Window Closed / Lapsed |