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 06:58
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US250385A
Cited
US2043142A
Cited
US1729063A
Cited
US1908049A
Cited
US1990007A
Cited
US2171057A
Cited
US2017834A
Cited
US2116561A
Cited
US2049047A
Cited
US2087500A
Cited
US2063012A
Cited
US2170320A
Cited
US2143909A
Cited
US2160852A
Cited
US2168060A
Cited
US2174102A
Cited
US2155040A
Cited
US2168192A
Cited
US2279129A
Cited
US2336029A
Cited
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 |