Patent US2992477A successfully refreshed from Google Patents.
US2992477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bit puller
Assignee: K O DUNCAN Co
•
Filing: 1957-10-07
•
Granted: 1961-07-18
•
Expires: 1977-10-07
Abstract
No abstract record available.
Inventors
- 👤 John Y Duncan
- 👤 Florentin J Pearne
- 👤 Frank S Pearne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:02
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/18; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53704; Y10T29/53796; Y10T29/5383
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US961375A
Cited
US1017968A
Cited
US1055790A
Cited
US1155720A
Cited
US1512422A
Cited
US1879335A
Cited
US2003648A
Cited
US2217152A
Cited
US2434983A
Cited
US2465837A
Cited
US2627654A
Cited
US2719047A
Cited
US2700201A
Cited
US2755112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |