US2670644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Attachment for power-driven rotary tools
Assignee: Thor Power Tool Co
•
Filing: 1951-07-19
•
Granted: 1954-03-02
•
Expires: 1971-07-19
Abstract
No abstract record available.
Inventors
- 👤 Sell Giles H Du
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:11
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/0064
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US171353A
Cited
US1360136A
Cited
US915568A
Cited
US1487746A
Cited
US2127855A
Cited
US2257089A
Cited
US2272279A
Cited
US2394348A
Cited
US2484364A
Cited
US2518049A
Cited
US2570164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |