US3382940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percussion drill bit
Assignee: Individual
•
Filing: 1965-10-21
•
Granted: 1968-05-14
•
Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 Frank E Stebley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:04
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/36; E21B10/40; E21B10/46; E21B10/56; E21B10/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1063982A
Cited
US1388490A
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US2097030A
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US2326908A
Cited
US2604305A
Cited
US2689109A
Cited
US2506388A
Cited
US2687875A
Cited
US2750156A
Cited
US3139149A
Cited
US3163245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |