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US3606584A
Expired / Lapsed
US
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Well tools
Assignee: Otis Engineering Corp
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Filing: 1969-02-19
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Granted: 1971-09-20
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Expires: 1989-02-19
Abstract
Abstract A WELL TOOL SYSTEM, PARTICULARLY ADAPTED TO PRODUCING WELLS BY GAS LIFT, INCLUDING SPACED PARALLEL TUBING STRINGS INTERCONNECTED BY CROSS-OVER ASSEMBLIES FOR INTRODUCING LIFT GAS INTO A WELL THROUGH ONE TUBING STRING AND PRODUCTION OF WELL FLUIDS THROUGH THE OTHER TUBING STRING INDEPENDENTLY OF THE CASING ANNULUS WHICH MAY REMAIN LIQUID FULL DURING THE GAS LIFT PROCEDURE.
Inventors
- 👤 Phillip S Sizer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:04
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B23/00; E21B23/02; E21B23/08; E21B43/00; E21B43/12; E21B43/121; E21B43/122
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |