US2698736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination pellet impact drill and annulus cutting drill
Assignee: Standard Oil Development Co
•
Filing: 1952-01-29
•
Granted: 1955-01-04
•
Expires: 1972-01-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Leroy W Ledgerwood
- 👤 Frank G Boucher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:17
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1193468A
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US994866A
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US1512841A
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US1628033A
Cited
US1642572A
Cited
US2072627A
Cited
US2233260A
Cited
US2329393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-03 | 1958-07-05 | 1959-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-03 | 1962-07-05 | 1963-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-03 | 1966-07-05 | 1967-01-04 | $7700.00 | Window Closed / Lapsed |