US3384191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: Reed Roller Bit Co
•
Filing: 1965-08-13
•
Granted: 1968-05-21
•
Expires: 1985-08-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Percy W Schumacher
- 👤 Dan B Justman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:13
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/18; E21B10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1289179A
Cited
US1582332A
Cited
US1736840A
Cited
US2518591A
Cited
US2710741A
Cited
US2849214A
Cited
US2887301A
Cited
US2949281A
Cited
US3297100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-21 | 1971-11-20 | 1972-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-21 | 1975-11-20 | 1976-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-21 | 1979-11-20 | 1980-05-21 | $7700.00 | Window Closed / Lapsed |