US2579712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: Individual
•
Filing: 1949-05-21
•
Granted: 1951-12-25
•
Expires: 1969-05-21
Abstract
No abstract record available.
Inventors
- 👤 Carl V Tilden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:32
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/44; E21B10/445; B; B23; B23B; B23B51/00; B23B51/04; B23B2226/00; B23B2226/75; B23B2251/00; B23B2251/40; B23B2251/408; B23B2251/50; B23B2251/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US838339A
Cited
US1388168A
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US1477855A
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US1912854A
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US2072320A
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US2126405A
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US2177300A
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US2495073A
Cited
US2506474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |