US2912228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill head for wing cutters
Assignee: Individual
•
Filing: 1957-07-05
•
Granted: 1959-11-10
•
Expires: 1977-07-05
Abstract
No abstract record available.
Inventors
- 👤 Charles W Kandle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:37
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/44; E21B10/26; E21B10/32; E21B10/327; E21B7/00; E21B7/003; E21B7/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US146752A
Cited
US147323A
Cited
US1052847A
Cited
US1858263A
Cited
US1881101A
Cited
US2000195A
Cited
US2688465A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-09 | 1963-05-11 | 1963-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-09 | 1967-05-11 | 1967-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-09 | 1971-05-11 | 1971-11-10 | $7700.00 | Window Closed / Lapsed |