Patent US4511634A successfully refreshed from Google Patents.
Patent US2688341A successfully refreshed from Google Patents.
US2688341A
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Valve
Assignee: PAUL A DEWHIRST
•
Filing: 1950-01-07
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Granted: 1954-09-07
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Expires: 1970-01-07
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Mcbain
- 👤 Macbain Donald Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:12
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/24; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86928; Y10T137/86936; Y10T137/86944; Y10T137/86976
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1592748A
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US1650077A
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US1822655A
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Cited
US1922225A
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US1897678A
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US1998913A
Cited
US2166484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |