Patent US2644671A successfully refreshed from Google Patents.
US2644671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drilling bit
Assignee: Individual
•
Filing: 1947-03-04
•
Granted: 1953-07-07
•
Expires: 1967-03-04
Abstract
No abstract record available.
Inventors
- 👤 Martell D Ingram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:20
CPC Classifications
E; E21; E21B; E21B12/00; E21B12/06; F; F16; F16C; F16C33/00; F16C33/30; F16C33/58; F16C33/64; F16C2352/00
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |