Patent US4595603A successfully refreshed from Google Patents.
US4595603A
Expired / Lapsed
US
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Method of making diamond heatsink assemblies
Assignee: PLESSY SEMICONDUCTORS Ltd
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Filing: 1984-10-24
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Granted: 1986-06-17
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Expires: 2004-10-24
Abstract
Abstract A method of making a diamond heatsink includes securing a number of spaced diamonds to a sacrificial plate and then metallizing them with, for example, a thin layer of gold, silver, copper or aluminium. The plate and the diamonds are subsequently metal plated with a similar metal to the metallization until the diamonds are completely covered. The sacrificial plate is removed and the exposed surface cleaned and polished. Finally the assembly is diced to produce a number of individual heatsink assemblies.
Inventors
- 👤 Ian Davies
- 👤 Anthony M. Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:31
CPC Classifications
H; H10; H10W; H10W99/00; H10W40/00; H10W40/20; H10W40/25; H10W40/254; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49799; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
A method of making a diamond heatsink assembly, said method comprising the steps of: securing a plurality of diamonds to a sacrificial plate, metallising the exposed portions of the diamonds with a relatively thin layer of metal, each diamond remaining substantially unmetallised where the diamond abuts the sacrificial plate, plating the sacrificial plate and the exposed portions of the diamond with a relatively thick layer of metal, removing the sacrificial plate to expose only a portion of each diamond, and dividing the layer of metal substantially enclosing the plurality of diamonds and said relatively thin layer of metal plating into a plurality of parts, each part including at least one diamond to produce a plurality of individual diamond heatsink assemblies.
Claim 2
Independent Claim
120 words
A method of making a diamond heatsink assembly, said method comprising the steps of: securing a plurality of diamonds to a sacrificial plate, metallising the exposed portions of the diamonds with a relatively thin layer of metal, each diamond remaining substantially unmetallised where the diamond abuts the sacrificial plate, plating the sacrificial plate and the exposed portions of the diamond with a relatively thick layer of metal, removing the sacrificial plate to expose only a portion of each diamond, and dividing the layer of metal substantially enclosing the plurality of diamonds and said relatively thin layer of metal plating into a plurality of parts, each part including at least one diamond to produce a plurality of individual diamond heatsink assemblies.
Claim 3
Dependent Claim
17 words
A method as claimed in claim 1 in which the sacrificial plate comprises any relatively cheap metal.
Claim 4
Dependent Claim
36 words
A method as claimed in claim 1 in which the relatively thin layer of metallisation on the exposed portions of the diamonds comprises a metal selected from the group comprising gold, silver, copper, aluminium and chromium.
Claim 5
Dependent Claim
30 words
A method as claimed in claim 1 in which the relatively thick layer of metal plating comprises a metal selected from the group comprising platinum, gold, silver, copper and aluminium.
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) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |