US3127945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drag bit
Assignee: Jersey Production Research Co
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Filing: 1960-03-02
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Granted: 1964-04-07
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Expires: 1980-03-02
Abstract
No abstract record available.
Inventors
- 👤 Harold C Bridwell
- 👤 David S Rowley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:36
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A ROTARY DRAG BIT COMPRISING A BIT BODY AND A PLURALITY OF BLADES DEPENDING FROM SAID BODY, EACH OF SAID BLADES HAVING A FACE AND GAGE EDGE FORMED FROM A MATRIX WITHIN WHICH ARE BONDED CUTTING PARTICLES BETWEEN ABOUT 0.045 AND ABOUT 0.250 INCH IN SIZE HAVING A ROCKWELL A HARDNESS IN EXCESS OF ABOUT 85, SAID MATRIX COMPRISING HARD ABRASION-RESISTANT POWDER GRANULES BETWEEN ABOUT 150 AND ABOUT 400 MESH IN SIZE INTERSPERSED WITHIN A BONDING METAL HAVING A MELTING POINT BELOW ABOUT 2400* F. AND IN THE MOLTEN STATE HAVING THE ABILITY TO WET SAID CUTTING PARTICLES AND POWDER GRANULES, THE THICKNESS OF SAID MATRIX DECREASING ACROSS THE FACE OF EACH BLADE FROM THE GAGE EDGE TO THE INNER EDGE, AND THE TOTAL MATRIX CROSS-SECTIONAL AREA ON THE BOTTOMS OF SAID BLADES RANGING BETWEEN ABOUT 1/14 AND ABOUT 1/36 OF THE AREA SWEPT BY SAID BLADES AS SAID BIT IS ROTATED.
Claim 2
Dependent Claim
152 words
A ROTARY DRAG BIT COMPRISING A BIT BODY AND A PLURALITY OF BLADES DEPENDING FROM SAID BODY, EACH OF SAID BLADES HAVING A FACE AND GAGE EDGE FORMED FROM A MATRIX WITHIN WHICH ARE BONDED CUTTING PARTICLES BETWEEN ABOUT 0.045 AND ABOUT 0.250 INCH IN SIZE HAVING A ROCKWELL A HARDNESS IN EXCESS OF ABOUT 85, SAID MATRIX COMPRISING HARD ABRASION-RESISTANT POWDER GRANULES BETWEEN ABOUT 150 AND ABOUT 400 MESH IN SIZE INTERSPERSED WITHIN A BONDING METAL HAVING A MELTING POINT BELOW ABOUT 2400* F. AND IN THE MOLTEN STATE HAVING THE ABILITY TO WET SAID CUTTING PARTICLES AND POWDER GRANULES, THE THICKNESS OF SAID MATRIX DECREASING ACROSS THE FACE OF EACH BLADE FROM THE GAGE EDGE TO THE INNER EDGE, AND THE TOTAL MATRIX CROSS-SECTIONAL AREA ON THE BOTTOMS OF SAID BLADES RANGING BETWEEN ABOUT 1/14 AND ABOUT 1/36 OF THE AREA SWEPT BY SAID BLADES AS SAID BIT IS ROTATED.
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) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |