US2952137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low pressure refrigerating systems
Assignee: Individual
•
Filing: 1959-01-02
•
Granted: 1960-09-13
•
Expires: 1979-01-02
Abstract
No abstract record available.
Inventors
- 👤 John E Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:30
CPC Classifications
F; F25; F25B; F25B41/00; F25B2400/00; F25B2400/16; F25B2400/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2159251A
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US2512869A
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US2589859A
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US2590741A
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US2570979A
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US2617264A
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US2617265A
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US2655794A
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US2778195A
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US2871673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |