Patent US2639672A successfully refreshed from Google Patents.
US2639672A
Expired / Lapsed
US
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Controlled pressurizing of pumps
Assignee: Individual
•
Filing: 1947-11-15
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Granted: 1953-05-26
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Expires: 1967-11-15
Abstract
No abstract record available.
Inventors
- 👤 James P Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:08
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/12; F04C2/14; F04C2/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB135834A
Cited
US1475683A
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US1771863A
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US1972632A
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US2044873A
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US2159748A
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US2105259A
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US2211154A
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US2176322A
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US2270222A
Cited
US2336294A
Cited
US2444165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |