US2878654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible air conditioning system with hot gas defrosting means
Assignee: MERCER ENGINEERING Co
•
Filing: 1954-12-30
•
Granted: 1959-03-24
•
Expires: 1974-12-30
Abstract
No abstract record available.
Inventors
- 👤 Kramer Israel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:35
CPC Classifications
F; F25; F25B; F25B47/00; F25B47/02; F25B47/022; F25B47/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1882597A
Cited
US2276814A
Cited
US2525560A
Cited
US2664721A
Cited
US2763130A
Cited
US2677243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |