US3385372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow control float collar
Assignee: Halliburton Co
•
Filing: 1967-01-11
•
Granted: 1968-05-28
•
Expires: 1987-01-11
Abstract
No abstract record available.
Inventors
- 👤 Lloyd C Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:03
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7854
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3126060A
Cited
US1899121A
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US1984107A
Cited
US2342367A
Cited
US2642140A
Cited
US2717648A
Cited
US2748873A
Cited
US3051246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-28 | 1971-11-27 | 1972-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-28 | 1975-11-27 | 1976-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-28 | 1979-11-27 | 1980-05-28 | $7700.00 | Window Closed / Lapsed |