Patent US2299053A successfully refreshed from Google Patents.
US3374587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill grinding attachment
Assignee: SIMPKINS
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Filing: 1966-03-16
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Granted: 1968-03-26
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Expires: 1986-03-16
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Simpkins
- 👤 Howard H Crawford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:12
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/24; B24B3/247; B24B41/00; B24B41/06; B24B41/066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A DRILL GRINDING ATTACHMENT COMPRISING AN ELONGATED DRILL RECEIVING TROUGH, SAID TROUGH HAVING FORWARD AND REAR ENDS, A DRILL GUIDE ON THE FORWARD DIRECTED INNER EDGE SAID DRILL GUIDE INCLUDING AN UPWARDLY DIRECTED INNER EDGE DEFINED BY TWO GENERALLY CONVERGING EDGE PORTIONS, AN INTEGRAL UPWARDLY PROJECTING LUG POSITIONED SUBSTANTIALLY AT THE POINT OF JUCTURE OF SAID EDGE PORTIONS AND DEFINING AND ABUTMENT FACE AT THE ADJACENT END OF A FIRST OF SAID EDGE PORTIONS FOR ENGAGEMENT OF THE LEADING EDGE OF A DRILL THEREAGAINST, THE SECOND OF SAID EDGE PORTIONS BEING ABOVE THE INNER SURFACE OF THE TROUGH AND ARCUATELY CONCAVE BETWEEN SAID LUG AND THE OUTER END THEREOF SO AS TO DEFINE A DRILL EDGE ENGAGING SURFACE ADAPTED TO ENGAGE A FOLLOWING EDGE OF DIFFERENT SIZE DRILLS UPON THE ENGAGEMENT OF A LEADING EDGE OF THE CORRESPONDING DRILL AGAINST SAID ABUTMENT FACE.
Claim 2
Dependent Claim
143 words
A DRILL GRINDING ATTACHMENT COMPRISING AN ELONGATED DRILL RECEIVING TROUGH, SAID TROUGH HAVING FORWARD AND REAR ENDS, A DRILL GUIDE ON THE FORWARD DIRECTED INNER EDGE SAID DRILL GUIDE INCLUDING AN UPWARDLY DIRECTED INNER EDGE DEFINED BY TWO GENERALLY CONVERGING EDGE PORTIONS, AN INTEGRAL UPWARDLY PROJECTING LUG POSITIONED SUBSTANTIALLY AT THE POINT OF JUCTURE OF SAID EDGE PORTIONS AND DEFINING AND ABUTMENT FACE AT THE ADJACENT END OF A FIRST OF SAID EDGE PORTIONS FOR ENGAGEMENT OF THE LEADING EDGE OF A DRILL THEREAGAINST, THE SECOND OF SAID EDGE PORTIONS BEING ABOVE THE INNER SURFACE OF THE TROUGH AND ARCUATELY CONCAVE BETWEEN SAID LUG AND THE OUTER END THEREOF SO AS TO DEFINE A DRILL EDGE ENGAGING SURFACE ADAPTED TO ENGAGE A FOLLOWING EDGE OF DIFFERENT SIZE DRILLS UPON THE ENGAGEMENT OF A LEADING EDGE OF THE CORRESPONDING DRILL AGAINST SAID ABUTMENT FACE.
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) | 1971-03-26 | 1971-09-25 | 1972-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-26 | 1975-09-25 | 1976-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-26 | 1979-09-25 | 1980-03-26 | $7700.00 | Window Closed / Lapsed |