Patent US4211294A successfully refreshed from Google Patents.
US4211294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impregnated diamond drill bit
Assignee: Acker Drill Co Inc
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Filing: 1978-04-21
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Granted: 1980-07-08
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Expires: 1998-04-21
Abstract
Abstract An impregnated diamond drill bit having a crown containing a plurality of diamond particles. The crown is formed from a fused powdered metallic matrix that includes titanium carbide and a nickel-manganese alloy. The diamond particles are dispersed within the metallic matrix which is then fused so as to hold the diamond particles in place. Although the mixture including the nickel-manganese solid solutions has a lower degree of hardness than that of prior impregnated diamond drill bits, the use of the nickel-manganese alloy improves the retention ability of the metallic matrix for securing the diamonds within the crown. A steel shank is attached to the crown.
Inventors
- 👤 Leonid Multakh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:35
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/48; B; B23; B23P; B23P15/00; B23P15/28; B23P5/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
An impregnated diamond drill bit comprising: a crown containing diamond particles dispersed within a fused metallic matrix having a hardness of no greater than 10 Rockwell C and containing a metal alloy having a relatively low melting temperature and capable of preparing the surfaces of the diamond particles so that said surfaces have a greater affinity for the metallic matrix and a metal shank attached to said crown, said metal alloy being formed essentially of nickel and manganese so as to give a nickel-manganese alloy.
Claim 2
Dependent Claim
85 words
An impregnated diamond drill bit comprising: a crown containing diamond particles dispersed within a fused metallic matrix having a hardness of no greater than 10 Rockwell C and containing a metal alloy having a relatively low melting temperature and capable of preparing the surfaces of the diamond particles so that said surfaces have a greater affinity for the metallic matrix and a metal shank attached to said crown, said metal alloy being formed essentially of nickel and manganese so as to give a nickel-manganese alloy.
Claim 3
Dependent Claim
99 words
An impregnated diamond drill bit comprising: a crown formed of a fused metallic matrix having a hardness of less than approximately 20 Rockwell C, said metal matrix containing between 15% and 50% of a metal alloy, said alloy being formed essentially of nickel and manganese so as to give a nickel-manganese alloy, said metal alloy being capable of preparing the surfaces of the diamond particles so that said surfaces have a greater affinity for the metallic matrix, said crown having a plurality of diamond particles dispersed within said fused metallic matrix and a shank member attached to said crown.
Claim 4
Dependent Claim
99 words
An impregnated diamond drill bit comprising: a crown formed of a fused metallic matrix having a hardness of less than approximately 20 Rockwell C, said metal matrix containing between 15% and 50% of a metal alloy, said alloy being formed essentially of nickel and manganese so as to give a nickel-manganese alloy, said metal alloy being capable of preparing the surfaces of the diamond particles so that said surfaces have a greater affinity for the metallic matrix, said crown having a plurality of diamond particles dispersed within said fused metallic matrix and a shank member attached to said crown.
Claim 5
Dependent Claim
18 words
An impregnated diamond drill bit as defined in claim 1 wherein said metal alloy is a nickel-manganese alloy.
Claim 6
Dependent Claim
26 words
An impregnated diamond drill bit as defined in claim 1 wherein said metal alloy acts to securely retain said diamond particles within said fused metallic matrix.
Claim 7
Dependent Claim
27 words
An impregnated diamond drill bit as defined in claim 1 or 2 wherein said metallic matrix includes a mixture of titanium carbide, iron and said metal alloy.
Claim 8
Dependent Claim
23 words
An impregnated diamond drill bit as defined in claim 5 wherein said fused metallic matrix has a hardness of approximately 10 Rockwell C.
Claim 9
Dependent Claim
39 words
An impregnated diamond drill bit as defined in claim 5 wherein said fused metallic matrix is formed from a mixture including 15% to 50% by weight of nickel-manganese alloy, 10% to 50% titanium carbide and 20% to 50% iron.
Claim 10
Dependent Claim
29 words
An impregnated diamond drill bit as defined in claim 7 wherein said nickel-manganese alloy is formed from a mixture of 50% to 60% nickel and 40% to 50% manganese.
Claim 11
Dependent Claim
26 words
An impregnated diamond drill bit as defined in claim 8 wherein a majority of said diamond particles are approximately between 40 to 50 mesh in size.
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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) | 1983-07-08 | 1984-01-07 | 1984-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-08 | 1988-01-07 | 1988-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-08 | 1992-01-07 | 1992-07-08 | $7700.00 | Window Closed / Lapsed |