US2544476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air or gas relief valve
Assignee: John Venning & Co Ltd
•
Filing: 1945-02-07
•
Granted: 1951-03-06
•
Expires: 1965-02-07
Abstract
No abstract record available.
Inventors
- 👤 Venning John Daniel Eldret
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:53
CPC Classifications
F; F16; F16K; F16K24/00; F16K24/04; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3084; Y10T137/3087; Y10T137/309; Y10T137/7722; Y10T137/7781; Y10T137/7793
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US725640A
Cited
US1494026A
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US1747456A
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AT115819B
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US1854094A
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US2046228A
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US2125662A
Cited
FR827828A
Cited
GB470171A
Cited
US2164272A
Cited
US2331431A
Cited
US2372456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |