US3292707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well flow control device
Assignee: Koehring Co
•
Filing: 1964-05-15
•
Granted: 1966-12-20
•
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
2026-11-01 20:00
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/778
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A WELL FLOW CONTROL DEVICE ADAPTED TO BE INSTALLED IN A WELL STRING, COMPRISING A BODY HAVING A FLOW-WAY THERETHROUGH AND ADAPTED TO BE CONNECTED TO A WELL STRING, SAID BODY DEFINING AN ANNULAR VALVE SEAT SURROUNDING SAID FLOW-WAY, A FLAPPER VALVE ADAPTED TO ENGAGE SAID ANNULAR VALVE SEAT AND CLOSE FLOW UPWARDLY THROUGH SAID FLOW-WAY, MEANS URGING SAID FLAPPER VALVE TOWARD ENGAGEMENT WITH SAID ANNULAR VALVE SEAT, AN ANNULAR ELEMENT POSITIONED WITHIN SAID BODY BELOW SAID FLAPPER VALVE AND HAVING AN UPPER BORE AND A LARGER LOWER BORE DEFINING A PASSAGEWAY THROUGH SAID ANNULAR ELEMENT, A SEGMENT MEMBER MOVABLE ONLY VERTICALLY WITHIN SAID ANNULAR ELEMENT FROM AN UPPER POSITION TO A LOWER POSITION, AND
Claim 2
Dependent Claim
115 words
A WELL FLOW CONTROL DEVICE ADAPTED TO BE INSTALLED IN A WELL STRING, COMPRISING A BODY HAVING A FLOW-WAY THERETHROUGH AND ADAPTED TO BE CONNECTED TO A WELL STRING, SAID BODY DEFINING AN ANNULAR VALVE SEAT SURROUNDING SAID FLOW-WAY, A FLAPPER VALVE ADAPTED TO ENGAGE SAID ANNULAR VALVE SEAT AND CLOSE FLOW UPWARDLY THROUGH SAID FLOW-WAY, MEANS URGING SAID FLAPPER VALVE TOWARD ENGAGEMENT WITH SAID ANNULAR VALVE SEAT, AN ANNULAR ELEMENT POSITIONED WITHIN SAID BODY BELOW SAID FLAPPER VALVE AND HAVING AN UPPER BORE AND A LARGER LOWER BORE DEFINING A PASSAGEWAY THROUGH SAID ANNULAR ELEMENT, A SEGMENT MEMBER MOVABLE ONLY VERTICALLY WITHIN SAID ANNULAR ELEMENT FROM AN UPPER POSITION TO A LOWER POSITION, 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) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |