Patent US2848852A successfully refreshed from Google Patents.
US2848852A
Expired / Lapsed
US
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Twist drill-bit sharpening unit
Assignee: Individual
•
Filing: 1955-02-23
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Granted: 1958-08-26
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Expires: 1975-02-23
Abstract
No abstract record available.
Inventors
- 👤 Gordon T Rosholt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:51
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/24; B24B3/26; B24B3/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |