Patent US2921732A successfully refreshed from Google Patents.
US2921732A
Expired / Lapsed
US
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Control for compressors
Assignee: Individual
•
Filing: 1956-04-16
•
Granted: 1960-01-19
•
Expires: 1976-04-16
Abstract
No abstract record available.
Inventors
- 👤 Vin Henry E De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:21
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/02; F04B49/022; F04B49/007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1931771A
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US2130607A
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US2112414A
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US2256654A
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US2286538A
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US2225291A
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US2295775A
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US2312728A
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US2432553A
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US2635546A
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US2537474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |