US2891389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioning apparatus
Assignee: Westinghouse Electric Corp
•
Filing: 1956-07-06
•
Granted: 1959-06-23
•
Expires: 1976-07-06
Abstract
No abstract record available.
Inventors
- 👤 Robert H Tull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:43
CPC Classifications
F; F24; F24F; F24F1/00; F24F1/02; F24F1/029; F24F1/03; F24F1/031; F24F1/032; F24F1/0323
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2736176A
Cited
US2335627A
Cited
US2496355A
Cited
US2600316A
Cited
US2620638A
Cited
US2760353A
Cited
US2769320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-22 | 1962-12-22 | 1963-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-22 | 1966-12-22 | 1967-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-22 | 1970-12-22 | 1971-06-23 | $7700.00 | Window Closed / Lapsed |