Patent US2714855A successfully refreshed from Google Patents.
US2714855A
Expired / Lapsed
US
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Apparatus for gas lift of liquid in wells
Assignee: N F B DISPLACEMENT CO Ltd
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Filing: 1952-05-01
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Granted: 1955-08-09
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Expires: 1972-05-01
Abstract
No abstract record available.
Inventors
- 👤 Brown Norman Fraser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:42
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
APPARATUS FOR RAISING IN A WELL BY GASEOUS PRESSURE, INCLUDING A FREE POSITION ADAPTED TO BE PRIMED AND TO MOVE UP AND DOWN IN TUBING, IN COMBINATION WITH MEANS FOR CATCHING AND HOLDING SAID FREE PISTON WHILE SAID FREE PISTON IS BEING PRIMED, MEANS FOR PRIMING SAID FREE PISTON WHILE BEING SO HELD AND MEANS RESPONSIVE TO OPERATION OF SAID PRINTING MEANS FOR RELEASING SAID FREE PISTON AFTER IT HAS BEEN PRINTED.
Claim 2
Dependent Claim
72 words
APPARATUS FOR RAISING IN A WELL BY GASEOUS PRESSURE, INCLUDING A FREE POSITION ADAPTED TO BE PRIMED AND TO MOVE UP AND DOWN IN TUBING, IN COMBINATION WITH MEANS FOR CATCHING AND HOLDING SAID FREE PISTON WHILE SAID FREE PISTON IS BEING PRIMED, MEANS FOR PRIMING SAID FREE PISTON WHILE BEING SO HELD AND MEANS RESPONSIVE TO OPERATION OF SAID PRINTING MEANS FOR RELEASING SAID FREE PISTON AFTER IT HAS BEEN PRINTED.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-08-08 | 1959-02-07 | 1959-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-08 | 1963-02-07 | 1963-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-08 | 1967-02-07 | 1967-08-09 | $7700.00 | Window Closed / Lapsed |