US2638930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm
Assignee: Niles Bement Pond Co
•
Filing: 1946-10-25
•
Granted: 1953-05-19
•
Expires: 1966-10-25
Abstract
No abstract record available.
Inventors
- 👤 John M Barr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:39
CPC Classifications
F; F16; F16J; F16J3/00; F16J3/02; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US971583A
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US1175373A
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US1466087A
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US1610173A
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US1734470A
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US1790206A
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US1998815A
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US2149507A
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US2178953A
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US2275712A
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US2380983A
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US2391674A
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US2478575A
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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 |