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US4755490A
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Low firing temperature ceramic materials
Assignee: Kyocera America Inc
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Filing: 1987-10-19
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Granted: 1988-07-05
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Expires: 2007-10-19
Abstract
Abstract A dense, sintered ceramic material having a low dielectric constant and a low coefficient of thermal expansion is provided from a mixture of 10-50 wt. % alumina, 0-30 wt. % fused silica, and 50-60 wt. % of a frit comprised of CaO, MgO, Al 2 O 3 , B 2 O 3 , and SiO 2 . The mixture has a minimum sintering temperature in the range of 850°-1000° C., and can be formed by conventional manufacturing techniques. It is particularly useful for the fabrication of single or multilayer electronic circuit substrates.
Inventors
- 👤 John F. DiLazzaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:08
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045; C03C14/00; C03C14/004; H; H10; H10W; H10W99/00; C03C2214/00; C03C2214/04; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K1/09; H05K1/092
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
78 words
A method of making low firing temperature sintered ceramic materials, comprising the steps of: providing a mixture consisting essentially of 10-50 wt.% alumina, 0-30 wt.% fused silica, and 50-60 wt.% of a frit composed of about 4 wt.% CaO, about 12 wt.% MgO, about 13 wt.% Al 2 O 3 , about 29 wt.% B 2 O 3 , and about 42 wt.% SiO 2 , and sintering the mixture at a temperature not greater than 1000° C.
Claim 2
Independent Claim
78 words
A method of making low firing temperature sintered ceramic materials, comprising the steps of: providing a mixture consisting essentially of 10-50 wt.% alumina, 0-30 wt.% fused silica, and 50-60 wt.% of a frit composed of about 4 wt.% CaO, about 12 wt.% MgO, about 13 wt.% Al 2 O 3 , about 29 wt.% B 2 O 3 , and about 42 wt.% SiO 2 , and sintering the mixture at a temperature not greater than 1000° C.
Claim 3
Dependent Claim
23 words
The method of claim 1, wherein the mixture is sintered in an oxidizing atmosphere at a temperature in the range of 850°-1000° C.
Claim 4
Dependent Claim
15 words
The method of claim 2, wherein the mixture comprises a nonzero percentage of fused silica.
Claim 5
Dependent Claim
28 words
The method of claim 1, wherein prior to sintering the mixture is formed into an object and a metallic composition is deposited on the object in a pattern.
Claim 6
Dependent Claim
25 words
The method of claim 4, wherein the metal is selected from the group consisting of gold, silver, platinum, palladium, alloys of the foregoing, and copper.
Claim 7
Dependent Claim
26 words
The method of claim 1 in which the alumina, fused silica and frit are reduced to a particle size of about 1-2 microns prior to sintering.
Claim 8
Independent Claim
68 words
A method of making low firing temperature ceramic materials, comprising the steps of: providing a mixture consisting essentially of 10-50 wt.% alumina, 0-30 wt.% fused silica, and 50-60 wt.% of a frit comprising about 4 wt.% CaO, about 12 wt.% MgO, about 13 wt.% Al 2 O 3 , about 29 wt.% B 2 O 3 , and about 42 wt.% SiO 2 ; and sintering the mixture.
Claim 9
Independent Claim
68 words
A method of making low firing temperature ceramic materials, comprising the steps of: providing a mixture consisting essentially of 10-50 wt.% alumina, 0-30 wt.% fused silica, and 50-60 wt.% of a frit comprising about 4 wt.% CaO, about 12 wt.% MgO, about 13 wt.% Al 2 O 3 , about 29 wt.% B 2 O 3 , and about 42 wt.% SiO 2 ; and sintering the mixture.
Claim 10
Dependent Claim
14 words
The method of claim 7, wherein the mixture is sintered in an oxidizing atmosphere.
Claim 11
Dependent Claim
26 words
The method of claim 7 in which the alumina, fused silica and frit are reduced to a particle size of about 1-2 microns prior to sintering.
Claim 12
Dependent Claim
68 words
A ceramic material produced by a method comprising the steps of: providing a mixture consisting essentially of 10-50 wt.% of alumina, 0-30 wt.% fused silica, and 50-60 wt.% of a frit composed of about 4 wt.% CaO, about 12 wt.% MgO, about 13 wt.% Al 2 O 3 , about 29 wt.% B 2 O 3 , and about 42 wt.% SiO 2 ; and sintering the mixture.
Claim 13
Dependent Claim
68 words
A ceramic material produced by a method comprising the steps of: providing a mixture consisting essentially of 10-50 wt.% of alumina, 0-30 wt.% fused silica, and 50-60 wt.% of a frit composed of about 4 wt.% CaO, about 12 wt.% MgO, about 13 wt.% Al 2 O 3 , about 29 wt.% B 2 O 3 , and about 42 wt.% SiO 2 ; and sintering the mixture.
Claim 14
Dependent Claim
20 words
The ceramic material of claim 10, wherein the mixture is sintered at a temperature in the range of 850°-1000° C.
Claim 15
Dependent Claim
16 words
The ceramic material of claim 11, wherein the mixture contains a nonzero percentage of fused silica.
Claim 16
Dependent Claim
24 words
The ceramic material of claim 10 wherein the alumina, fused silica and frit have a particle size of about 1-2 microns prior to sintering.
Claim 17
Dependent Claim
65 words
A batch for making a low firing temperature ceramic material, the batch comprising a mixture consisting essentially of 10-50 wt.% of alumina, 0-30 wt.% fused silica, and 50-60 wt.% of a frit composed of about 4 wt.% CaO, about 12 wt.% MgO, about 13 wt.% Al 2 O 3 , about 29 wt.% B 2 O 3 , and about 42 wt.% SiO 2 .
Claim 18
Dependent Claim
65 words
A batch for making a low firing temperature ceramic material, the batch comprising a mixture consisting essentially of 10-50 wt.% of alumina, 0-30 wt.% fused silica, and 50-60 wt.% of a frit composed of about 4 wt.% CaO, about 12 wt.% MgO, about 13 wt.% Al 2 O 3 , about 29 wt.% B 2 O 3 , and about 42 wt.% SiO 2 .
Claim 19
Dependent Claim
15 words
The batch of claim 14, wherein the batch contains a nonzero percentage of fused silica.
Claim 20
Dependent Claim
23 words
The batch of claim 14 herein the alumina, fused silica and frit have a particle size of about 1-2 microns prior to sintering.
References Cited (Backward Citations)
US3019116A
Cited
US3457091A
Cited
US4481261A
Cited
JPS60103075A
Cited
US4536329A
Cited
US4537703A
Cited
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) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |