Patent US2587943A successfully refreshed from Google Patents.
US2587943A
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US
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Pressure-vacuum control valve
Assignee: Individual
•
Filing: 1948-04-19
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Granted: 1952-03-04
•
Expires: 1968-04-19
Abstract
No abstract record available.
Inventors
- 👤 John H Wiggins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:08
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/18; F16K17/19; Y; Y10; Y10T; Y10T137/00; Y10T137/4456; Y10T137/4621; Y10T137/7722; Y10T137/7771
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1651971A
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US1652793A
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US1678700A
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US1905583A
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US1917623A
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US2171168A
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US2050685A
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US2168891A
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US2215308A
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US2317923A
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US2313855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-04 | 1955-09-03 | 1956-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-04 | 1959-09-03 | 1960-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-04 | 1963-09-03 | 1964-03-04 | $7700.00 | Window Closed / Lapsed |