US2840104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure relief valve
Assignee: Shafer Valve Co
•
Filing: 1953-08-03
•
Granted: 1958-06-24
•
Expires: 1973-08-03
Abstract
No abstract record available.
Inventors
- 👤 Homer J Shafer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:32
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; Y10T137/7768
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1767702A
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US2239657A
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US2223044A
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US2351871A
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GB548796A
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US2387225A
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US2504057A
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US2487418A
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US2665105A
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US2576516A
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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) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |