Patent US4239502A successfully refreshed from Google Patents.
US4239502A
Expired / Lapsed
US
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Diamond and cubic boron nitride grinding wheels with improved silver alloy bonds
Assignee: General Electric Co
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Filing: 1978-11-17
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Granted: 1980-12-16
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Expires: 1998-11-17
Abstract
Abstract A silver-manganese-zirconium brazing alloy with a high percentage of silver at least exceeding 80 percent is used in a process for fabricating strong, high thermal conductivity bonds between diamond or cubic boron nitride (CBN) and a molybdenum or tungsten support member. Typical diamond or CBN-alloy-metal products with the improved alloy bond are semiconductor device heat sinks, grinding wheels and tools.
Inventors
- 👤 Glen A. Slack
- 👤 Warren S. Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:38
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/50; B; B23; B23B; B23B27/00; B23B27/14; B23B27/148; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3006; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B24D3/06; C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; C09; C09K; C09K3/00; C09K3/14; C09K3/1436; C09K3/1445; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/125; C04B2237/126; C04B2237/127; C04B2237/30; C04B2237/32; C04B2237/36; C04B2237/363; C04B2237/40; C04B2237/403; C04B2237/50; C04B2237/76; C04B2237/86
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
97 words
A grinding wheel comprising a plurality of particles selected from the group consisting of diamond and CBN, a rim portion having coefficient of thermal expansion substantially matching the coefficient of thermal expansion of said body and being made of a metal selected from the group consisting of molybdenum and tungsten, said particles being distributed over the surface of said rim portion and bonded thereto with a silver-base alloy bonding layer consisting essentially in atom percent of 0.1 to 15 percent manganese, 0.1 to 5 percent zirconium, and the balance silver, said alloy bonded chemically to said body.
Claim 2
Dependent Claim
97 words
A grinding wheel comprising a plurality of particles selected from the group consisting of diamond and CBN, a rim portion having coefficient of thermal expansion substantially matching the coefficient of thermal expansion of said body and being made of a metal selected from the group consisting of molybdenum and tungsten, said particles being distributed over the surface of said rim portion and bonded thereto with a silver-base alloy bonding layer consisting essentially in atom percent of 0.1 to 15 percent manganese, 0.1 to 5 percent zirconium, and the balance silver, said alloy bonded chemically to said body.
Claim 3
Dependent Claim
37 words
A grinding wheel according to claim 1 wherein the rim portion is made of molybdenum and said silver-base alloy bonding layer consists essentially in atom percent of 3 percent manganese, 3 percent zirconium, and 94 percent silver.
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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) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |