US2526489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making drill bits
Assignee: Individual
•
Filing: 1947-12-04
•
Granted: 1950-10-17
•
Expires: 1967-12-04
Abstract
No abstract record available.
Inventors
- 👤 Liddicoat Percill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:56
CPC Classifications
B; B21; B21K; B21K5/00; B21K5/02; B21K5/06; B21J; B21J13/00; B21J13/02; B21J13/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2134386A
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US2371041A
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US2340529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-16 | 1954-04-17 | 1954-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-16 | 1958-04-17 | 1958-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-16 | 1962-04-17 | 1962-10-17 | $7700.00 | Window Closed / Lapsed |