Patent GB255262A successfully refreshed from Google Patents.
US2726724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well tools
Assignee: Individual
•
Filing: 1952-09-08
•
Granted: 1955-12-13
•
Expires: 1972-09-08
Abstract
No abstract record available.
Inventors
- 👤 Lowell M Wilhoit
- 👤 Harry B Schramm
- 👤 Herbert C Otis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:03
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/02; C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; E21B21/00; E21B21/10; E21B21/103
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-12 | 1959-06-13 | 1959-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-12 | 1963-06-13 | 1963-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-12 | 1967-06-13 | 1967-12-13 | $7700.00 | Window Closed / Lapsed |