US2931191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerating system with means to obtain high liquid line pressure
Assignee: Individual
•
Filing: 1956-03-09
•
Granted: 1960-04-05
•
Expires: 1976-03-09
Abstract
No abstract record available.
Inventors
- 👤 John E Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:57
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/02; F25B49/027; Y; Y10; Y10S; Y10S62/00; Y10S62/17
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1944472A
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US2188350A
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US2277647A
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US2589859A
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US2621051A
Cited
US2590741A
Cited
US2685780A
Cited
US2705404A
Cited
US2740263A
Cited
US2778195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |