US3491830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back-off tool assembly
Assignee: WILLIAM G SWEETMAN
•
Filing: 1968-04-05
•
Granted: 1970-01-27
•
Expires: 1988-04-05
Abstract
No abstract record available.
Inventors
- 👤 William G Sweetman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:30
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/107; E21B31/1075
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2031505A
Cited
US2080875A
Cited
US2853944A
Cited
US2725942A
Cited
US2905437A
Cited
US2725940A
Cited
US3313234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |