Patent US2898136A successfully refreshed from Google Patents.
US2898136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casing stop collar to mount a well tool
Assignee: Individual
•
Filing: 1954-06-22
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Granted: 1959-08-04
•
Expires: 1974-06-22
Abstract
No abstract record available.
Inventors
- 👤 Sr Jesse E Hall
- 👤 John A Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:19
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/02
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |