Patent US2806674A successfully refreshed from Google Patents.
US2806674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat pumps
Assignee: Westinghouse Electric Corp
•
Filing: 1954-09-02
•
Granted: 1957-09-17
•
Expires: 1974-09-02
Abstract
No abstract record available.
Inventors
- 👤 Gerald L Biehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:50
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)
US2342566A
Cited
US2110168A
Cited
US2148414A
Cited
US2054404A
Cited
US2071178A
Cited
US2241060A
Cited
US2320501A
Cited
US2431501A
Cited
US2468626A
Cited
US2488636A
Cited
US2544544A
Cited
US2672734A
Cited
US2669099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |