US2717762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling apparatus
Assignee: Individual
•
Filing: 1951-10-23
•
Granted: 1955-09-13
•
Expires: 1971-10-23
Abstract
No abstract record available.
Inventors
- 👤 James M Mcgregor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:00
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/16; E21B10/00; E21B10/08; E21B10/18; E21B4/00; E21B4/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US292888A
Cited
US710935A
Cited
US1390025A
Cited
US1484065A
Cited
US1891416A
Cited
US2184065A
Cited
US2348046A
Cited
US2548616A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-12 | 1959-03-14 | 1959-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-12 | 1963-03-14 | 1963-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-12 | 1967-03-14 | 1967-09-13 | $7700.00 | Window Closed / Lapsed |