US4481016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making tool inserts and drill bits
Assignee: Individual
•
Filing: 1981-11-30
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Granted: 1984-11-06
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Expires: 2001-11-30
Abstract
Abstract A method of making inserts suitable for tool or drill bits which includes the step of fragmenting, e.g. by means of a laser beam, an abrasive compact in a plurality of discrete, non-segmental fragments. The inserts may have a variety of shapes, some of which are new, such as conical, truncated conical or truncated pyrimidal. The inserts are particularly useful for wire-drawing die blanks and core or oil-well drill bits.
Inventors
- 👤 Nicoll A. D. Campbell
- 👤 Henry B. Dyer
- 👤 Rainer Dietrich
- 👤 Cornelius Phaal
- 👤 Douglas J. Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:28
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/5673; B; B21; B21C; B21C3/00; B21C3/02; B21C3/025; B21C3/18; B23; B23P; B23P15/00; B23P15/28; B23P15/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
71 words
A wire-drawing die insert comprising an abrasive compact fragment selected from the group consisting of diamond and cubic boron nitride in the shape of a truncated pyramid or a truncated cone and having a centrally located hole extending from the base to the truncated apex and suitably embedded in a metal or cemented carbide support so that the direction of wire drawing will be from the base to the truncated apex.
Claim 2
Dependent Claim
71 words
A wire-drawing die insert comprising an abrasive compact fragment selected from the group consisting of diamond and cubic boron nitride in the shape of a truncated pyramid or a truncated cone and having a centrally located hole extending from the base to the truncated apex and suitably embedded in a metal or cemented carbide support so that the direction of wire drawing will be from the base to the truncated apex.
Claim 3
Dependent Claim
45 words
A drill bit comprising a plurality of fragments of abrasive compact selected from the group consisting of diamond and cubic boron nitride in the shape of a truncated pyramid or a truncated cone with the base of each fragment suitably mounted in a metal matrix.
Claim 4
Dependent Claim
45 words
A drill bit comprising a plurality of fragments of abrasive compact selected from the group consisting of diamond and cubic boron nitride in the shape of a truncated pyramid or a truncated cone with the base of each fragment suitably mounted in a metal matrix.
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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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |