US3425439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butterfly valve
Assignee: Flowserve Corp
•
Filing: 1965-10-19
•
Granted: 1969-02-04
•
Expires: 1985-10-19
Abstract
No abstract record available.
Inventors
- 👤 Donn W Duffey
- 👤 Jack L Wissman
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; F16K1/2265; C; C09; C09B; C09B33/00; C09B33/02; C09B33/153; F16K27/00; F16K27/02; F16K27/0209; F16K27/0218; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/7036
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA647005A
Cited
US3073336A
Cited
FR1226799A
Cited
US3148896A
Cited
US3072139A
Cited
US3143132A
Cited
US3227174A
Cited
US3329398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |