Patent US2873672A successfully refreshed from Google Patents.
Patent US2368327A successfully refreshed from Google Patents.
Patent US4770655A successfully refreshed from Google Patents.
Patent US4019015A successfully refreshed from Google Patents.
Patent US3476438A successfully refreshed from Google Patents.
US3476438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutter bit
Assignee: Hughes Tool Co
•
Filing: 1967-12-18
•
Granted: 1969-11-04
•
Expires: 1987-12-18
Abstract
No abstract record available.
Inventors
- 👤 Arnold B Bower Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:53
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |