US2739458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat pump system
Assignee: Acme Industries Inc
•
Filing: 1952-11-22
•
Granted: 1956-03-27
•
Expires: 1972-11-22
Abstract
No abstract record available.
Inventors
- 👤 Alwin B Newton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:15
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2286604A
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US2292335A
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US2425703A
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US2473013A
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US2462329A
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US2638123A
Cited
US2690327A
Cited
US2563935A
Cited
US2589384A
Cited
US2622617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |