US2576541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back-pressure relief valve
Assignee: RIALTO Corp
•
Filing: 1948-05-22
•
Granted: 1951-11-27
•
Expires: 1968-05-22
Abstract
No abstract record available.
Inventors
- 👤 William H Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:53
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/025; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7794; Y10T137/7832; Y10T137/7835; Y10T137/7836
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US556704A
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US688306A
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US1148568A
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US1185333A
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US1270961A
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US1554683A
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US1650150A
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US2304991A
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US2367682A
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US2394911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-26 | 1955-05-28 | 1955-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-26 | 1959-05-28 | 1959-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-26 | 1963-05-28 | 1963-11-27 | $7700.00 | Window Closed / Lapsed |