US2990882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well packers
Assignee: Individual
•
Filing: 1956-01-25
•
Granted: 1961-07-04
•
Expires: 1976-01-25
Abstract
No abstract record available.
Inventors
- 👤 Cicero C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:33
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/122
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2704580A
Cited
US1898261A
Cited
US2508285A
Cited
US2719587A
Cited
US2739651A
Cited
US2717041A
Cited
US2806536A
Cited
US2893492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |