US3383946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill collar
Assignee: Reed Roller Bit Co
•
Filing: 1965-08-09
•
Granted: 1968-05-21
•
Expires: 1985-08-09
Abstract
No abstract record available.
Inventors
- 👤 Dan B Justman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:59
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/16
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US447136A
Cited
US524266A
Cited
USRE25485E
Cited
US787320A
Cited
US1006661A
Cited
US2570577A
Cited
US3237427A
Cited
US3207009A
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 |