US2536431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well tubing plug
Assignee: Individual
•
Filing: 1945-09-20
•
Granted: 1951-01-02
•
Expires: 1965-09-20
Abstract
No abstract record available.
Inventors
- 👤 William H Endsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:55
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1376156A
Cited
US1455499A
Cited
US1781918A
Cited
US1625540A
Cited
US1852512A
Cited
US2303556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |