US3481397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling the partial filling of a well conduit string and controlling flow through the conduit string
Assignee: Halliburton Co
•
Filing: 1968-03-07
•
Granted: 1969-12-02
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Expires: 1988-03-07
Abstract
No abstract record available.
Inventors
- 👤 Eugene E Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:31
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/7772
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US880088A
Cited
US1180282A
Cited
US2446139A
Cited
US2768695A
Cited
US2774116A
Cited
US3220481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-01 | 1973-06-02 | 1973-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-01 | 1977-06-02 | 1977-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-01 | 1981-06-02 | 1981-12-02 | $7700.00 | Window Closed / Lapsed |