Patent US3978744A successfully refreshed from Google Patents.
US3978744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamond wire drawing die blanks and methods of making the same
Assignee: Stoody Co
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Filing: 1975-03-17
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Granted: 1976-09-07
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Expires: 1995-03-17
Abstract
Abstract A diamond wire drawing die blank and method for making the same are provided in which a diamond die blank is formed by metering about one half of a metal powder required to form a shroud around a diamond into a die cavity, partially compressing said one half while forming a central conical depression in said powder, placing a diamond in the formed conical cavity, adding the remaining metal powder to the mold over the die and first compressed half, compressing the metal powder around the diamond and sintering said powder compact.
Inventors
- 👤 Neil J. Zachman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:39
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; B22F7/08; B21; B21C; B21C3/00; B21C3/02; B21C3/025; B21C3/18; B21K; B21K5/00; B21K5/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
161 words
The method of forming diamond wire drawing die blanks comprising the steps of a. metering substantially one half of a metal powder required to form a shroud around a diamond into a die cavity for receiving powder metal; b. partially compressing said substantially one half of the metal powder into a flat member of substantially uniform thickness in said die cavity; c. simultaneous with step (b) forming a central conical shaped depression in the top surface of said compacted powder metal; d. placing a diamond in said conical depression without removing the compacted powder metal from said die cavity; e. adding the remaining metal powder required to form a shroud into said die cavity over the diamond and said partially compressed one half without removing the compacted powder metal from said die cavity; f. compressing said remaining metal powder and said substantially one half of metal powder around said diamond in said die cavity; and g. sintering said metal powder compact.
Claim 2
Independent Claim
161 words
The method of forming diamond wire drawing die blanks comprising the steps of a. metering substantially one half of a metal powder required to form a shroud around a diamond into a die cavity for receiving powder metal; b. partially compressing said substantially one half of the metal powder into a flat member of substantially uniform thickness in said die cavity; c. simultaneous with step (b) forming a central conical shaped depression in the top surface of said compacted powder metal; d. placing a diamond in said conical depression without removing the compacted powder metal from said die cavity; e. adding the remaining metal powder required to form a shroud into said die cavity over the diamond and said partially compressed one half without removing the compacted powder metal from said die cavity; f. compressing said remaining metal powder and said substantially one half of metal powder around said diamond in said die cavity; and g. sintering said metal powder compact.
Claim 3
Dependent Claim
22 words
A method as claimed in claim 1 wherein at least one external axial conical depression is formed in the final compressed powder.
Claim 4
Dependent Claim
30 words
A method as claimed in claim 1 wherein the metal powder is compressed in step (b) under about 30% to 50% of the pressure needed to form the final die.
Claim 5
Dependent Claim
24 words
A method as claimed in claim 1 wherein an external conical axial depression is formed at each end of said blank during final compression.
Claim 6
Dependent Claim
33 words
A method as claimed in claim 1 wherein the metal powder is an alloy selected from the group consisting of Stellite alloys No. 6, No. 3, No. 589, No. 208 and No. 19.
Claim 7
Dependent Claim
16 words
A method as claimed in claim 1 wherein the metal powder is Stellite alloy No. 6.
Claim 8
Dependent Claim
28 words
A method as claimed in claim 1 wherein the final compressed blank is pressure sintered to substantially the full density in the sintering range of the alloy used.
Claim 9
Dependent Claim
19 words
A method as claimed in claim 1 wherein the metal powder is compressed between punches having axial conical projections.
References Cited (Backward Citations)
US2171323A
Cited
GB667809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |