US4659404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making low thermal expansivity and high thermal conductivity substrate
Assignee: Olin Corp
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Filing: 1985-06-24
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Granted: 1987-04-21
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Expires: 2005-06-24
Abstract
Abstract A composite is provided which is adaptable to be a substrate for an electronic application. The composite comprises first material particles having a coefficient of thermal expansion in the range of about -20×10 -7 to about 50×10 -7 in/in/° C. Second material particles having a coefficient of thermal expansion in the range of about 100×10 -7 to about 200×10 -7 in/in/° C. are mixed with the first material particles. A bonding agent adheres the first and second material particles into a coherent composite having a coefficient of thermal expansion in the range of about 1×10 -7 to about 50×10 -7 in/in/° C.
Inventors
- 👤 Sheldon H. Butt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:09
CPC Classifications
C; C04; C04B; C04B26/00; C04B26/02; B; B22; B22F; B22F1/00; B22F1/09; B32; B32B; B32B15/00; B32B15/01; B32B15/16; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K1/0313; H05K1/0353; H05K1/0373; H05K1/05; H10; H10W; H10W40/00; H10W40/20; H10W40/25; H10W40/257; H10W40/258; H10W70/00; H10W70/60; H10W70/67; H10W70/69; H10W70/692; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; H05K2201/0215; H05K2201/06; H05K2201/068; Y; Y10; Y10S; Y10S29/00; Y10S29/031
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
133 words
The process of forming a substrate for an electronic application, comprising the steps of: providing first material particles having a coefficient of thermal expansion in the range of about -20×10 -7 to about 50×10 -7 in/in°C.; providing second material particles having a coefficient of thermal expansion in the range of about 100×10 -7 to about 239×10 -7 in/in/°C.; mixing said first material particles with said second material particles; and bonding the mixture of said first and second material particles together with a bonding agent to form a coherent composite being a strong, resistant to thermal shock substrate having a coefficient of thermal expansion substantially less than about 100×10 -7 in/in/°C., said bonding agent adhering to said first and second material particles while maintaining the individual characteristics of the first and second material particles.
Claim 2
Dependent Claim
133 words
The process of forming a substrate for an electronic application, comprising the steps of: providing first material particles having a coefficient of thermal expansion in the range of about -20×10 -7 to about 50×10 -7 in/in°C.; providing second material particles having a coefficient of thermal expansion in the range of about 100×10 -7 to about 239×10 -7 in/in/°C.; mixing said first material particles with said second material particles; and bonding the mixture of said first and second material particles together with a bonding agent to form a coherent composite being a strong, resistant to thermal shock substrate having a coefficient of thermal expansion substantially less than about 100×10 -7 in/in/°C., said bonding agent adhering to said first and second material particles while maintaining the individual characteristics of the first and second material particles.
Claim 3
Dependent Claim
35 words
The process of claim 1 including the step of selecting said first and second materials so that said composite has a thermal conductivity in the range of about 65 to about 230 BTU/ft/ft 2 /hr/°F.
Claim 4
Dependent Claim
27 words
The process of claim 2 including the step of selecting said first material of particles from the group consisting of silica, ceramics, glass, metals and metal alloys.
Claim 5
Dependent Claim
14 words
The process of claim 3 further including said first material being particles of silica.
Claim 6
Dependent Claim
14 words
The process of claim 3 further including said first material being particles of glass.
Claim 7
Dependent Claim
14 words
The process of claim 3 further including said first material being particles of metal.
Claim 8
Dependent Claim
15 words
The process of claim 3 further including said first material being particles of metal alloys.
Claim 9
Dependent Claim
14 words
The process of claim 3 further including said first material being particles of ceramics.
Claim 10
Dependent Claim
22 words
The process of claim 3 including the step of selecting said second material from the group consisting of metal and metal alloys.
Claim 11
Dependent Claim
15 words
The process of claim 9 including the step of forming said composite into a strip.
Claim 12
Dependent Claim
23 words
The process of claim 10 further including the step of bonding a metallic foil to at least one surface of the composite strip.
Claim 13
Dependent Claim
27 words
The process of claim 10 including the step of coating a continuous layer of low melting temperature glass onto at least one surface of the composite strip.
Claim 14
Dependent Claim
37 words
The process of claim 12 further including the step of partially removing said second material from at least one surface of said composite strip to enhance the adherence of the glass coating to the first material particles.
Claim 15
Dependent Claim
33 words
The process of claim 1 including the steps of: compacting the first and second material particles and the bonding agent into a mixture of a desired shape; and consolidating the mixture with heat.
Claim 16
Dependent Claim
22 words
The process of claim 14 further including the step of heating said mixture in a reducing atmosphere to substantially eliminate metal oxides.
Claim 17
Dependent Claim
29 words
The process of claim 15 further including the step of coating the first material particles with the bonding agent prior to mixing the first and second material particles together.
Claim 18
Dependent Claim
29 words
The process of claim 15 including the step of coating the first material particles with the second material particles prior to mixing the first and second material particles together.
Claim 19
Dependent Claim
23 words
The process of claim 2 including the step of filling the interstices between the first and second material particles with a bonding agent.
Claim 20
Dependent Claim
24 words
The process of claim 9 including the step of selecting said bonding agent from the group consisting of glasses, organic adhesives, ceramics and metals.
Claim 21
Dependent Claim
12 words
The process of claim 19 further including said bonding agent being glass.
Claim 22
Dependent Claim
14 words
The process of claim 19 further including said bonding agent being an organic adhesive.
Claim 23
Dependent Claim
13 words
The process of claim 19 further including said bonding agent being a ceramic.
Claim 24
Dependent Claim
13 words
The process of claim 19 further including said bonding agent being a metal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-04-20 | 1990-10-20 | 1991-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-20 | 1994-10-20 | 1995-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-20 | 1998-10-20 | 1999-04-21 | $7700.00 | Window Closed / Lapsed |