Patent US2801079A successfully refreshed from Google Patents.
US2801079A
Expired / Lapsed
US
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Safety device for drill bit
Assignee: Individual
•
Filing: 1954-09-03
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Granted: 1957-07-30
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Expires: 1974-09-03
Abstract
No abstract record available.
Inventors
- 👤 Gress Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:40
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/62; E21B27/00; E21B27/005
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) | 1960-07-29 | 1961-01-28 | 1961-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-29 | 1965-01-28 | 1965-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-29 | 1969-01-28 | 1969-07-30 | $7700.00 | Window Closed / Lapsed |