Patent US2840348A successfully refreshed from Google Patents.
US2840348A
Expired / Lapsed
US
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Drill bit
Assignee: Individual
•
Filing: 1954-11-22
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Granted: 1958-06-24
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Expires: 1974-11-22
Abstract
No abstract record available.
Inventors
- 👤 Carl V Tilden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:19
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/04; B23B51/0413; E; E21; E21B; E21B10/00; E21B10/02; E21B10/04; E21B10/44; E21B10/445; B23B2226/00; B23B2226/75; B23B2251/00; B23B2251/40; B23B2251/408; B23B2251/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US443072A
Cited
GB190205115A
Cited
US1867024A
Cited
US2567084A
Cited
US2506474A
Cited
DE905126C
Cited
GB685967A
Cited
US2594256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |