US2801524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat pump including hot gas defrosting means
Assignee: General Electric Co
•
Filing: 1954-07-22
•
Granted: 1957-08-06
•
Expires: 1974-07-22
Abstract
No abstract record available.
Inventors
- 👤 Haven G Fifield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:04
CPC Classifications
F; F25; F25B; F25B13/00; F25B2313/00; F25B2313/027; F25B2313/02732
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2143687A
Cited
US2135285A
Cited
US2440146A
Cited
US2474304A
Cited
US2619326A
Cited
US2611587A
Cited
US2677243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |