Patent CN1154582C successfully refreshed from Google Patents.
US3311181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bi-metal drilling tooth
Assignee: Individual
•
Filing: 1964-05-04
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Granted: 1967-03-28
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Expires: 1984-05-04
Abstract
No abstract record available.
Inventors
- 👤 John B Fowler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:55
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/5676
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
THE COMBINATION WITH A ROTARY DRILL BIT MATRIX HAVING TOOTH-RECEIVING SOCKET MEANS THEREIN AND ADAPTED FOR WORKING ROTATION IN A PREDETERMINED DIRECTION, OF A DRILL TOOTH WITH A FOLLOWING WORKING SECTION AND A LEADING HOLDING SECTION WITH PORTIONS THEREOF SECURED IN SAID SOCKET MEANS AND OTHER PORTIONS THEREOF EXTENDING FROM SAID SOCKET MEANS AND THE MATRIX, SAID HOLDING SECTION HAVING A LESSER DEGREE OF HARDNESS THAN SAID WORKING SECTION.
Claim 2
Dependent Claim
69 words
THE COMBINATION WITH A ROTARY DRILL BIT MATRIX HAVING TOOTH-RECEIVING SOCKET MEANS THEREIN AND ADAPTED FOR WORKING ROTATION IN A PREDETERMINED DIRECTION, OF A DRILL TOOTH WITH A FOLLOWING WORKING SECTION AND A LEADING HOLDING SECTION WITH PORTIONS THEREOF SECURED IN SAID SOCKET MEANS AND OTHER PORTIONS THEREOF EXTENDING FROM SAID SOCKET MEANS AND THE MATRIX, SAID HOLDING SECTION HAVING A LESSER DEGREE OF HARDNESS THAN SAID WORKING SECTION.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |