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
2026-10-30 19:02
CPC Classifications
F; F25; F25B; F25B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1904875A
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US2049748A
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US2293532A
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US2425119A
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US2568891A
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US2517169A
Cited
US2585748A
Cited
US2558938A
Cited
US2728197A
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US2748572A
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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 |