Patent US3389718A successfully refreshed from Google Patents.
US3389718A
Expired / Lapsed
US
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High and low pressure wellhead shut-in valve
Assignee: Fisher Governor Co
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Filing: 1966-09-16
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Granted: 1968-06-25
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Expires: 1986-09-16
Abstract
No abstract record available.
Inventors
- 👤 Cecil M Johnson
- 👤 Shelby E Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:50
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/02; F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/10; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7725; Y10T137/7758; Y10T137/7762; Y10T137/7769; Y10T137/777
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2619109A
Cited
US3043331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |