Patent US3002608A successfully refreshed from Google Patents.
US5118643A
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Low dielectric inorganic composition for multilayer ceramic package containing titanium silicate glass
Assignee: Alcoa Corp
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Filing: 1990-10-25
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Granted: 1992-06-02
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Expires: 2010-10-25
Abstract
Abstract A ceramic composition for forming a ceramic dielectric body having a dielectric constant of less than about 4.2 at 1 MHz and a linear thermal expansion coefficient of 2.5-3.0 ppm/ DEG C. from room temperature to 200 DEG C. The composition comprises a mixture of finely divided particles of 25-50 vol. % borosilicate glass and 50-75 vol. % titanium silicate glass. The composition can be used with a polymeric binder to produce an unfired green tape which is co-fireable with high conductivity metallurgies such as gold, silver and silver/palladium.
Inventors
- 👤 Jau-Ho Jean
- 👤 Tapan K. Gupta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:04
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02; C03C10/00; C03C10/0009; H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/087; H01B3/12; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/10; H01G4/105; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/69; H10W70/692; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24926
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
42 words
A ceramic composition for forming a ceramic dielectric body having a dielectric constant of less than about 4.2, said composition comprising a mixture of finely divided particles of: (a) 25-50 vol. % borosilicate glass; and (b) 50-75 vol. % titanium silicate glass.
Claim 2
Dependent Claim
42 words
A ceramic composition for forming a ceramic dielectric body having a dielectric constant of less than about 4.2, said composition comprising a mixture of finely divided particles of: (a) 25-50 vol. % borosilicate glass; and (b) 50-75 vol. % titanium silicate glass.
Claim 3
Dependent Claim
59 words
The ceramic composition of claim 1 in which the borosilicate glass has the composition: 0-3 wt. % Al 2 O 3 , 20-30 wt. %, B 2 O 3 , 0-3 wt. % CaO, 0-3 wt. % K 2 O, 0-3 wt. % Li 2 O, 0-3 wt. % Na 2 O, and 60-80 wt. % SiO 2 .
Claim 4
Dependent Claim
30 words
The ceramic composition of claim 1 in which the titanium silicate glass has the composition: 1-20 wt. % titania, 80-99 wt. % SiO 2 , and the remainder incidental impurities.
Claim 5
Dependent Claim
25 words
The ceramic composition of claim 1 wherein the formed ceramic dielectric body has a thermal expansion coefficient in the range of about 2.5-3.0 ppm/° C.
Claim 6
Dependent Claim
20 words
The ceramic composition of claim 1 in which the mixture of finely divided particles is dispersed in an organic medium.
Claim 7
Dependent Claim
22 words
The ceramic composition of claim 5 in which the organic medium is comprised of a polymeric binder dissolved in an organic solvent.
Claim 8
Dependent Claim
22 words
The ceramic composition of claim 6 in which the organic solvent is a volatile solvent and the dispersion is of castable consistency.
Claim 9
Dependent Claim
38 words
A castable ceramic composition comprising: (a) mixture of 25-50 vol. % borosilicate glass and 50-75 vol. % titanium silicate glass; (b) 15-30 wt. % of an organic medium comprised of a polymeric binder dissolved in, an organic solvent.
Claim 10
Dependent Claim
38 words
A castable ceramic composition comprising: (a) mixture of 25-50 vol. % borosilicate glass and 50-75 vol. % titanium silicate glass; (b) 15-30 wt. % of an organic medium comprised of a polymeric binder dissolved in, an organic solvent.
Claim 11
Independent Claim
61 words
A method of making a ceramic dielectric body having a dielectric constant of less than about 4.2, comprising the steps of; (a) providing a mixture consisting essentially of finely divided particles of comprising 25-50 vol. % borosilicate glass and 50-75 vol. % titanium silicate glass; and (b) sintering the mixture in air to a temperature not greater than about 1000° C.
Claim 12
Independent Claim
61 words
A method of making a ceramic dielectric body having a dielectric constant of less than about 4.2, comprising the steps of; (a) providing a mixture consisting essentially of finely divided particles of comprising 25-50 vol. % borosilicate glass and 50-75 vol. % titanium silicate glass; and (b) sintering the mixture in air to a temperature not greater than about 1000° C.
Claim 13
Dependent Claim
58 words
The method of claim 9 in which the borosilicate glass has the composition: 0-3 wt. % Al 2 O 3 , 20-30 wt. %, B 2 O 3 , 0-3 wt. % CaO, 0-3 wt. % K 2 O, 0-3 wt. % Li 2 O, 0-3 wt. % Na 2 O, and 60-80 wt. % SiO 2 .
Claim 14
Dependent Claim
29 words
The method of claim 9 in which the titanium silicate glass has the composition: 1-20 wt. % titania, 80-99 wt. % SiO 2 , and the remainder incidental impurities.
Claim 15
Dependent Claim
121 words
A multilayer ceramic circuit board formed of a plurality of laminated ceramic circuit board units, each unit including a ceramic insulating layer, a patterned electrical conductor layer supported on said ceramic insulating layer and through hole electrical conductors for connecting said patterned electrical conductor layers of said respective ceramic circuit board units to form a wiring circuit, said electrical conductor layers and said through hole electrical conductors selected from the group of gold, silver and palladium said ceramic insulating layer comprising: a sintered mixture of 25-50 vol. % borosilicate glass and 50-75 vol. % titanium silicate glass, said ceramic insulating layer sintered at a temperature below the melting temperature of said patterned electrical conductor layers and said through hole electrical conductors.
Claim 16
Dependent Claim
121 words
A multilayer ceramic circuit board formed of a plurality of laminated ceramic circuit board units, each unit including a ceramic insulating layer, a patterned electrical conductor layer supported on said ceramic insulating layer and through hole electrical conductors for connecting said patterned electrical conductor layers of said respective ceramic circuit board units to form a wiring circuit, said electrical conductor layers and said through hole electrical conductors selected from the group of gold, silver and palladium said ceramic insulating layer comprising: a sintered mixture of 25-50 vol. % borosilicate glass and 50-75 vol. % titanium silicate glass, said ceramic insulating layer sintered at a temperature below the melting temperature of said patterned electrical conductor layers and said through hole electrical conductors.
Claim 17
Dependent Claim
59 words
The ceramic composition of claim 12 in which the borosilicate glass has the composition: 0-3 wt. % Al 2 O 3 , 20-30 wt. %, B 2 O 3 , 0-3 wt. % CaO, 0-3 wt. % K 2 O, 0-3 wt. % Li 2 O, 0-3 wt. % Na 2 O, and 60-80 wt. % SiO 2 .
Claim 18
Dependent Claim
31 words
The ceramic circuit board of claim 12 in which the titanium silicate glass has the composition: 1-20 wt. % titania, 80-99 wt. % SiO 2 , and the remainder incidental impurities.
References Cited (Backward Citations)
US3926648A
Cited
US4169001A
Cited
US4547625A
Cited
US4567542A
Cited
US4642148A
Cited
US4672152A
Cited
US4755490A
Cited
US4724021A
Cited
US4879261A
Cited
US4788046A
Cited
US4849379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |