Patent US3100543A successfully refreshed from Google Patents.
US3100543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit for cutting cores
Assignee: TRI DIA Inc
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Filing: 1960-10-31
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Granted: 1963-08-13
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Expires: 1980-10-31
Abstract
No abstract record available.
Inventors
- 👤 Short Lot William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:02
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A CORE BIT ADAPTED TO BE ATTACHED TO A DRILL STEM FOR THE CUTTING OF CORES IN EARTH FORMATIONS, SAID CORE BIT COMPRISING A HOLLOW SHANK, AN ANNULAR BODY CARRIED BY SAID SHANK AND HAVING IN BOTTOM PLAN VIEW A GENERALLY TRIANGULAR OUTER CONFIGURATION DEFINED BY THREE COAXIAL SEGMENTAL SUBSTANTIALLY CYLINDRICAL LATERAL REAMING FACES AND BY THREE NON-REAMING FACETS, EACH OF SAID FACETS BEING OF GREATER CIRCUMFERENTIAL EXTENT THAN ANY OF SAID FACES WITH ONE SUCH FACET BETWEEN AND JOINING SUCCESSIVE ONES OF SAID REAMING FACES AND LYING WHOLLY WITHIN THE CYLINDRICAL SURFACE GENERATED BY SAID REAMING FACES, SAID BODY HAVING A COAXIAL CORE-RECEIVING OPENING IN COMMUNICATION WITH THE HOLLOW OF SAID SHANK, AND ABRADING ELEMENTS SET IN SAID REAMING FACES AND IN THE INNER, LOWER AND OUTER SURFACES OF SAID ANNULAR BODY.
Claim 2
Dependent Claim
133 words
A CORE BIT ADAPTED TO BE ATTACHED TO A DRILL STEM FOR THE CUTTING OF CORES IN EARTH FORMATIONS, SAID CORE BIT COMPRISING A HOLLOW SHANK, AN ANNULAR BODY CARRIED BY SAID SHANK AND HAVING IN BOTTOM PLAN VIEW A GENERALLY TRIANGULAR OUTER CONFIGURATION DEFINED BY THREE COAXIAL SEGMENTAL SUBSTANTIALLY CYLINDRICAL LATERAL REAMING FACES AND BY THREE NON-REAMING FACETS, EACH OF SAID FACETS BEING OF GREATER CIRCUMFERENTIAL EXTENT THAN ANY OF SAID FACES WITH ONE SUCH FACET BETWEEN AND JOINING SUCCESSIVE ONES OF SAID REAMING FACES AND LYING WHOLLY WITHIN THE CYLINDRICAL SURFACE GENERATED BY SAID REAMING FACES, SAID BODY HAVING A COAXIAL CORE-RECEIVING OPENING IN COMMUNICATION WITH THE HOLLOW OF SAID SHANK, AND ABRADING ELEMENTS SET IN SAID REAMING FACES AND IN THE INNER, LOWER AND OUTER SURFACES OF SAID ANNULAR BODY.
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) | 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 |