Patent US3463247A successfully refreshed from Google Patents.
US3463247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill stem breakout apparatus
Assignee: James S Robbins & Associates Inc
•
Filing: 1967-08-07
•
Granted: 1969-08-26
•
Expires: 1987-08-07
Abstract
No abstract record available.
Inventors
- 👤 Harold T Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:20
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/16; E21B19/167
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US306588A
Cited
US2320107A
Cited
US2445659A
Cited
US2536216A
Cited
US2972388A
Cited
US3291225A
Cited
US3302735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-25 | 1973-02-24 | 1973-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-25 | 1977-02-24 | 1977-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-25 | 1981-02-24 | 1981-08-26 | $7700.00 | Window Closed / Lapsed |