Patent US2874810A successfully refreshed from Google Patents.
Patent US3022685A successfully refreshed from Google Patents.
US3022685A
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Ceramic drill bushing
Assignee: American Drill Bushing Co
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Filing: 1958-04-23
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Granted: 1962-02-27
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Expires: 1978-04-23
Abstract
No abstract record available.
Inventors
- 👤 Robert H Armacost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:10
CPC Classifications
B; B23; B23B; B23B49/00; B23B49/02; B23B49/023; Y; Y10; Y10S; Y10S417/00; Y10S417/01; Y10T; Y10T408/00; Y10T408/96
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A NON-METALLIC DRILL BUSHING COMPRISING A BODY HAVING A SUBSTANTIALLY CYLINDRICAL FORM A CONCENTRIC DRILL PASSAGE OF CIRCULAR CROSS-SECTION EXTENDING THERETHROUGH, THE BODY HAVING A BEVELLED EDGE FORMED THEREIN AT AN INLET END OF SAID PASSAGE, THE WALLS RESPECTIVELY OF SAID BODY AND SAID DRILL PASSAGE HAVING SURFACES REDUCED TO SIZE BY MECHANICAL WORKING, SAID BODY COMPRISING A COMPACTED DOUBLE FIRED CERAMIC MATERIAL CONSISTING OF ABOUT 95% BY WEIGHT OF ALUMIMUM OXIDE AND ABOUT 5% BY WEIGHT OF A PLURALITY OF OTHER METAL OXIDES.
Claim 2
Dependent Claim
84 words
A NON-METALLIC DRILL BUSHING COMPRISING A BODY HAVING A SUBSTANTIALLY CYLINDRICAL FORM A CONCENTRIC DRILL PASSAGE OF CIRCULAR CROSS-SECTION EXTENDING THERETHROUGH, THE BODY HAVING A BEVELLED EDGE FORMED THEREIN AT AN INLET END OF SAID PASSAGE, THE WALLS RESPECTIVELY OF SAID BODY AND SAID DRILL PASSAGE HAVING SURFACES REDUCED TO SIZE BY MECHANICAL WORKING, SAID BODY COMPRISING A COMPACTED DOUBLE FIRED CERAMIC MATERIAL CONSISTING OF ABOUT 95% BY WEIGHT OF ALUMIMUM OXIDE AND ABOUT 5% BY WEIGHT OF A PLURALITY OF OTHER METAL OXIDES.
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) | 1965-02-26 | 1965-08-28 | 1966-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-26 | 1969-08-28 | 1970-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-26 | 1973-08-28 | 1974-02-27 | $7700.00 | Window Closed / Lapsed |