Patent US4820090A successfully refreshed from Google Patents.
US2987072A
Expired / Lapsed
US
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Butterfly valve and sealing means therefor
Assignee: Individual
•
Filing: 1957-02-21
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Granted: 1961-06-06
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Expires: 1977-02-21
Abstract
No abstract record available.
Inventors
- 👤 Frank G Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:39
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226; F16K1/2263
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1824168A
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US1977351A
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US2054369A
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US2081842A
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US2385510A
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US2487659A
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US2499952A
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US2809060A
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US2847181A
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US2841429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |