Patent US3132490A successfully refreshed from Google Patents.
US3132490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse cycle heat pump
Assignee: Carrier Corp
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Filing: 1961-08-28
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Granted: 1964-05-12
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Expires: 1981-08-28
Abstract
No abstract record available.
Inventors
- 👤 Jack F Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:24
CPC Classifications
F; F25; F25B; F25B13/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
109 words
THE METHOD OF OPERATING A HEAT PUMP OF THE TYPE HAVING A REVERSE CYCLE REFRIGERATION SYSTEM COMPRISING THE STEPS OF CONDENSING REFRIGERANT IN A FIRST COIL WHILE EVAPORATING REFRIGERANT IN A SECOND COIL TO COOL THE AREA TO BE CONDITIONED, CONDENSING REFRIGERANT IN THE SECOND COIL WHILE EVAPORATING REFRIGERANT IN THE FIRST COIL TO HEAT THE AREA TO BE CONDITIONED, PERIODICALLY REVERTING TO COOLING CYCLE OPERATION DURING HEATING CYCLE OPERATION TO REMOVE FROST WHICH MAY FORM ON THE FIRST COIL, CONTROLLING THE INITIAL FLOW OF REFRIGERANT FROM THE FIRST COIL TO THE SECOND COIL IN RESPONSE TO A GREATLY REDUCED TEMPERATURE OF THE REFRIGERANT IN THE LINE CONNECTING THE
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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) | 1967-05-12 | 1967-11-11 | 1968-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-12 | 1971-11-11 | 1972-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-12 | 1975-11-11 | 1976-05-12 | $7700.00 | Window Closed / Lapsed |