Patent US2361446A successfully refreshed from Google Patents.
Patent US2271497A successfully refreshed from Google Patents.
US2271497A
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Pressure relief check valve
Assignee: Kenyon Instrument Co Inc
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Filing: 1941-02-04
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Granted: 1942-01-27
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Expires: 1961-02-04
Abstract
No abstract record available.
Inventors
- 👤 Arthur T Newell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:31
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/06; F16K15/063; F16K15/067; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/7837; Y10T137/7838; Y10T137/7869; Y10T137/7871; Y10T137/7874; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7939
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-01-26 | 1945-07-28 | 1946-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-01-26 | 1949-07-28 | 1950-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-01-26 | 1953-07-28 | 1954-01-27 | $7700.00 | Window Closed / Lapsed |