US2500888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure relief valve
Assignee: Waterous Co
•
Filing: 1943-11-06
•
Granted: 1950-03-14
•
Expires: 1963-11-06
Abstract
No abstract record available.
Inventors
- 👤 Edward A Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:47
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/10; F16K17/105; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7766
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1447546A
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US398841A
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US231214A
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US696074A
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US869524A
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US867651A
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US1101933A
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US1209145A
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US1804060A
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US2043453A
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US1957567A
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US2284615A
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US2274663A
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US2256365A
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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) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |