US2960840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for defrosting a refrigeration system
Assignee: Individual
•
Filing: 1956-02-27
•
Granted: 1960-11-22
•
Expires: 1976-02-27
Abstract
No abstract record available.
Inventors
- 👤 Fred J Hosken
- 👤 Edward J Hosken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:08
CPC Classifications
F; F25; F25B; F25B47/00; F25B47/02; F25B47/022; F25B5/00; F25B5/02
Claims Analysis
Total Claims: 0
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US2749721A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |