US2708103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination drill and core bit
Assignee: Individual
•
Filing: 1951-03-31
•
Granted: 1955-05-10
•
Expires: 1971-03-31
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward B Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:07
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/02; E21B10/00; E21B10/46; E21B10/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1867024A
Cited
US2189057A
Cited
US2421997A
Cited
US2495400A
Cited
US2555580A
Cited
US2660402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-09 | 1958-11-08 | 1959-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-09 | 1962-11-08 | 1963-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-09 | 1966-11-08 | 1967-05-10 | $7700.00 | Window Closed / Lapsed |