US3136347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit shank
Assignee: Greenlee Brothers and Co
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Filing: 1962-10-15
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Granted: 1964-06-09
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Expires: 1982-10-15
Abstract
No abstract record available.
Inventors
- 👤 Wayne A Linquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:26
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/005; B23B31/02; B23B31/10; B23B31/12; B23B2231/00; B23B2231/02; B23B2231/0216; B23B2231/0228; B23B2231/0232; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17863; Y10T408/00; Y10T408/89; Y10T408/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A DRILL BIT SHANK ADAPTED TO BE RECEIVED AND GRIPPED IN DRILL CHUCKS HAVING TWO, THREE, OR FOUR JAWS, SAID SHANK INCLUDING, IN COMBINATION, A FIRST PORTION OF SQUARE CROSSSECTION AND HAVING OPPOSED PARALLEL FACES ADAPTED TO BE GRIPPED BY A FOUR-JAW CHUCK, SAID FIRST PORTION BEING ADJACENT BUT SPACED FROM ONE END OF SAID SHANK, AND A SECOND PORTION AT SAID ONE END BEING OF REGULAR HEXAGONAL CROSS-SECTION AND REDUCED CROSS-SECTIONAL AREA ADAPTED TO BE GRIPPED IN A THREE-JAW CHUCK, SAID SECOND PORTION HAVING TWO PARALLEL FACES DISPOSED IN PLANES PARALLELING THE PLANES OF TWO OPPOSED FACES OF SAID FIRST PORTION WHEREBY BOTH PORTIONS OF THE SHANK MAY BE GRIPPED BETWEEN THE JAWS OF A TWO-JAW CHUCK TO INSURE SECURE DRIVING ENGAGEMENT AND PROPER ALINEMENT OF THE SHANK WITH THE CHUCK.
Claim 2
Dependent Claim
132 words
A DRILL BIT SHANK ADAPTED TO BE RECEIVED AND GRIPPED IN DRILL CHUCKS HAVING TWO, THREE, OR FOUR JAWS, SAID SHANK INCLUDING, IN COMBINATION, A FIRST PORTION OF SQUARE CROSSSECTION AND HAVING OPPOSED PARALLEL FACES ADAPTED TO BE GRIPPED BY A FOUR-JAW CHUCK, SAID FIRST PORTION BEING ADJACENT BUT SPACED FROM ONE END OF SAID SHANK, AND A SECOND PORTION AT SAID ONE END BEING OF REGULAR HEXAGONAL CROSS-SECTION AND REDUCED CROSS-SECTIONAL AREA ADAPTED TO BE GRIPPED IN A THREE-JAW CHUCK, SAID SECOND PORTION HAVING TWO PARALLEL FACES DISPOSED IN PLANES PARALLELING THE PLANES OF TWO OPPOSED FACES OF SAID FIRST PORTION WHEREBY BOTH PORTIONS OF THE SHANK MAY BE GRIPPED BETWEEN THE JAWS OF A TWO-JAW CHUCK TO INSURE SECURE DRIVING ENGAGEMENT AND PROPER ALINEMENT OF THE SHANK WITH THE CHUCK.
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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |