US2657896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butterfly valve assembly with continuous annular sealing means
Assignee: Individual
•
Filing: 1948-07-06
•
Granted: 1953-11-03
•
Expires: 1968-07-06
Abstract
No abstract record available.
Inventors
- 👤 Frank G Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:29
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226; F16K1/2261; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49636; Y10T29/49702
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1682075A
Cited
US1813126A
Cited
US1860619A
Cited
CH177010A
Cited
GB435059A
Cited
FR887167A
Cited
US2385510A
Cited
US2427787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |