US2853267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butterfly valve
Assignee: Henry Pratt Co LLC
•
Filing: 1955-02-17
•
Granted: 1958-09-23
•
Expires: 1975-02-17
Abstract
No abstract record available.
Inventors
- 👤 Wilson T Herren
- 👤 Donald G Fawkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:37
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226; F16K1/228; F16K1/2285
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1014775A
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US1591903A
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US1671069A
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US1682075A
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US2385510A
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US2586927A
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US2655942A
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US2754846A
Cited
FR1109352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |