US3275080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve release mechanism for a well device
Assignee: Koehring Co
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Filing: 1964-05-15
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Granted: 1966-09-27
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Expires: 1984-05-15
Abstract
No abstract record available.
Inventors
- 👤 Wayne F Nelson
- 👤 Gil R Boyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:38
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7854
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A WELL DEVICE ADAPTED FOR INSTALLATION IN A WELL STRING COMPRISING, A BODY HAVING A FLOW-WAY THERETHROUGH AND ADAPTED TO BE MADE UP IN A WELL STRING, AN ANNULAR VALVE SEAT IN SAID BODY SURROUNDING SAID FLOW-WAY, A FLAPPER VALVE ADAPTED TO ENGAGE SAID ANNULAR VALVE SEAT, SEATING OF SAID FLAPPER VALVE ON SAID SEAT CLOSING FLOW UPWARDLY THROUGH SAID FLOW-WAY, AN ANNULAR ELEMENT WITHIN SAID BODY NORMALLY HOLDING SAID FLAPPER VALVE OUT OF ENGAGEMENT WITH SAID SEAT, MEANS RELEASABLY SECURING SAID ANNULAR ELEMENT TO SAID BODY IN A POSITION HOLDING SAID FLAPPER TO SAID ENGAGEMENT WITH SAID SEAT, AND
Claim 2
Dependent Claim
100 words
A WELL DEVICE ADAPTED FOR INSTALLATION IN A WELL STRING COMPRISING, A BODY HAVING A FLOW-WAY THERETHROUGH AND ADAPTED TO BE MADE UP IN A WELL STRING, AN ANNULAR VALVE SEAT IN SAID BODY SURROUNDING SAID FLOW-WAY, A FLAPPER VALVE ADAPTED TO ENGAGE SAID ANNULAR VALVE SEAT, SEATING OF SAID FLAPPER VALVE ON SAID SEAT CLOSING FLOW UPWARDLY THROUGH SAID FLOW-WAY, AN ANNULAR ELEMENT WITHIN SAID BODY NORMALLY HOLDING SAID FLAPPER VALVE OUT OF ENGAGEMENT WITH SAID SEAT, MEANS RELEASABLY SECURING SAID ANNULAR ELEMENT TO SAID BODY IN A POSITION HOLDING SAID FLAPPER TO SAID ENGAGEMENT WITH SAID SEAT, AND
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |