Patent US3100545A successfully refreshed from Google Patents.
US3100545A
Expired / Lapsed
US
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Drill bit
Assignee: Ingersoll Rand Co
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Filing: 1961-04-11
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Granted: 1963-08-13
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Expires: 1981-04-11
Abstract
No abstract record available.
Inventors
- 👤 Robert D Zimmerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:51
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/046; E21B10/00; E21B10/36; E21B10/38; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17905; Y10T279/17914
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A DETACHABLE DRILL BIT COMPRISING A BODY WITH A FORWARD END HAVING CUTTING EDGES, A HOLLOW REARWARD DRILL STEEL RECEIVING SOCKET OF DECREASING CROSS-SECTIONAL AREA IN THE DIRECTION OF THE CUTTING EDGES, FOR AT LEAST PART OF ITS LENGTH AND STRESS DISTRIBUTING MEANS DISPOSED AT THE ONE END OF SAID DRILL STEEL RECEIVING SOCKET FOR DISTRIBUTING THE STRESS ON SAID DRILL BIT, SAID STRESS DISTRIBUTING MEANS BEING AN UNDERCUT GROOVE.
Claim 2
Dependent Claim
70 words
A DETACHABLE DRILL BIT COMPRISING A BODY WITH A FORWARD END HAVING CUTTING EDGES, A HOLLOW REARWARD DRILL STEEL RECEIVING SOCKET OF DECREASING CROSS-SECTIONAL AREA IN THE DIRECTION OF THE CUTTING EDGES, FOR AT LEAST PART OF ITS LENGTH AND STRESS DISTRIBUTING MEANS DISPOSED AT THE ONE END OF SAID DRILL STEEL RECEIVING SOCKET FOR DISTRIBUTING THE STRESS ON SAID DRILL BIT, SAID STRESS DISTRIBUTING MEANS BEING AN UNDERCUT GROOVE.
References Cited (Backward Citations)
US2233421A
Cited
US2890021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-12 | 1967-02-11 | 1967-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-12 | 1971-02-11 | 1971-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-12 | 1975-02-11 | 1975-08-13 | $7700.00 | Window Closed / Lapsed |