Patent US4210431A successfully refreshed from Google Patents.
Patent US3668569A successfully refreshed from Google Patents.
Patent US3052102A successfully refreshed from Google Patents.
US3052102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat pump and method of operation
Assignee: Individual
•
Filing: 1957-04-05
•
Granted: 1962-09-04
•
Expires: 1977-04-05
Abstract
No abstract record available.
Inventors
- 👤 Woodrow W Mcmillan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:33
CPC Classifications
F; F25; F25B; F25B13/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1904875A
Cited
US2049748A
Cited
US2293532A
Cited
US2425119A
Cited
US2568891A
Cited
US2517169A
Cited
US2585748A
Cited
US2558938A
Cited
US2728197A
Cited
US2748572A
Cited
US2764876A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-03 | 1966-03-05 | 1966-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-03 | 1970-03-05 | 1970-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-03 | 1974-03-05 | 1974-09-04 | $7700.00 | Window Closed / Lapsed |