US3011571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self cleaning rock drill bit
Assignee: Individual
•
Filing: 1961-01-23
•
Granted: 1961-12-05
•
Expires: 1981-01-23
Abstract
No abstract record available.
Inventors
- 👤 Bree Oscar L De
- 👤 Paul J Boudrez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:54
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/36; E21B10/38; E21B10/62
Claims Analysis
Total Claims: 0
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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) | 1964-12-04 | 1965-06-05 | 1965-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-04 | 1969-06-05 | 1969-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-04 | 1973-06-05 | 1973-12-05 | $7700.00 | Window Closed / Lapsed |