Patent US3471121A successfully refreshed from Google Patents.
US3471121A
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Butterfly valve
Assignee: Dresser Industries Inc
•
Filing: 1966-06-20
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Granted: 1969-10-07
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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
2026-10-31 22:39
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1858587A
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DE966300C
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US2883149A
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US2853267A
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US2913218A
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US3029063A
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US3143132A
Cited
US3341170A
Cited
US3376014A
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 |