Patent US443030A successfully refreshed from Google Patents.
Patent US3080145A successfully refreshed from Google Patents.
US3080145A
Expired / Lapsed
US
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Butterfly valves
Assignee: David F Wiseman and Sons Ltd
•
Filing: 1958-10-20
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Granted: 1963-03-05
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Expires: 1978-10-20
Abstract
No abstract record available.
Inventors
- 👤 Swain Frank Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:45
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)
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US2058996A
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US2754846A
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US2882010A
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US2893682A
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US3025035A
Cited
US2934312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-04 | 1966-09-03 | 1967-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-04 | 1970-09-03 | 1971-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-04 | 1974-09-03 | 1975-03-05 | $7700.00 | Window Closed / Lapsed |