US3471120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing means for butterfly valve
Assignee: Dresser Industries Inc
•
Filing: 1966-06-20
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Granted: 1969-10-07
•
Expires: 1986-06-20
Abstract
No abstract record available.
Inventors
- 👤 Donald L Geiselman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:21
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226; F16K1/2261
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US480643A
Cited
US1624891A
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US1245002A
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US2058010A
Cited
US2586927A
Cited
US3030068A
Cited
US3083725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |