US3536150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary-percussion drill bit
Assignee: Individual
•
Filing: 1968-09-05
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Granted: 1970-10-27
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Expires: 1988-09-05
Abstract
No abstract record available.
Inventors
- 👤 Frank E Stebley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:40
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/36; E21B10/46; E21B10/56; E21B10/62; E21B4/00; E21B4/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |