US2506474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: Individual
•
Filing: 1947-09-20
•
Granted: 1950-05-02
•
Expires: 1967-09-20
Abstract
No abstract record available.
Inventors
- 👤 Carl V Tilden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:07
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; B23B2260/00; B23B2260/072
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US52632A
Cited
US218374A
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US418903A
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US483210A
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US831056A
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US1484352A
Cited
US1512841A
Cited
US2308042A
Cited
US2425132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-01 | 1953-10-31 | 1954-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-01 | 1957-10-31 | 1958-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-01 | 1961-10-31 | 1962-05-02 | $7700.00 | Window Closed / Lapsed |