Patent US2638932A successfully refreshed from Google Patents.
US2638932A
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Pressure equalizer
Assignee: GEORGE E FAILING SUPPLY Co
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Filing: 1948-04-10
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Granted: 1953-05-19
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Expires: 1968-04-10
Abstract
No abstract record available.
Inventors
- 👤 Alexander Emmett Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:57
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/04; F16L55/045; F16L55/05; F16L55/052; F16L55/053; F15; F15B; F15B1/00; F15B1/02; F15B1/04; F15B1/08; F15B1/10; F15B1/106; F15B2201/00; F15B2201/20; F15B2201/205; F15B2201/30; F15B2201/315; F15B2201/3152; F15B2201/32; F15B2201/40; F15B2201/41; F15B2201/413; F15B2201/415; F15B2201/4155
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US852150A
Cited
US2383180A
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US2389792A
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US2446358A
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US2474554A
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US2540676A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |