US2877988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit with driven auxiliary bit
Assignee: American Coldset Corp
•
Filing: 1957-05-03
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Granted: 1959-03-17
•
Expires: 1977-05-03
Abstract
No abstract record available.
Inventors
- 👤 Harry M Cameron
- 👤 Eugene S Wassel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:25
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/14; E21B10/46; E21B10/50; E21B4/00; E21B4/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2511831A
Cited
US2667334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |