US5275889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layer wiring board
Assignee: Fujitsu Ltd
•
Filing: 1991-09-20
•
Granted: 1994-01-04
•
Expires: 2011-09-20
Abstract
Abstract A laminated multi-layer wiring board comprising alternate layers of a glass ceramic material and conductor pattern. The glass ceramic layers are made of a glass ceramic comprising glass and dispersed ceramic particles. The glass ceramic layers further contain hollow or porous silica glass spheres dispersed in the glass ceramic. The hollow or porous silica glass spheres are covered with a ceramic coating layer containing aluminum as a constituent element. Such a structure prevents crystallization of the silica spheres and the resultant rapid increase in the thermal expansion coefficient of the glass ceramic layer. The structure also procludes the formation of pores in the surfaces of the spheres.
Inventors
- 👤 Kishio Yokouchi
- 👤 Hiroshi Kamezaki
- 👤 Masato Wakamura
- 👤 Nobuo Kamehara
- 👤 Koichi Niwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:50
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/69; H10W70/692; H05K1/0306; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; H05K3/00; H05K3/46; H05K3/4611; H05K3/4626; H05K3/4629; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/24926; Y10T428/25; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
74 words
A multi-layer wiring board comprising alternate layers o a glass ceramic material and conductor patterns, said glass ceramic layers being image up of a fired admixture comprising a glass ceramic matrix and a multitude of ceramic particles which are dispersed in the glass ceramic matrix, said ceramic particles comprising hollow or porous silica glass spheres having an average diameter of not more than 20 μm are covered with an aluminum containing ceramic coating layer.
Claim 2
Dependent Claim
74 words
A multi-layer wiring board comprising alternate layers o a glass ceramic material and conductor patterns, said glass ceramic layers being image up of a fired admixture comprising a glass ceramic matrix and a multitude of ceramic particles which are dispersed in the glass ceramic matrix, said ceramic particles comprising hollow or porous silica glass spheres having an average diameter of not more than 20 μm are covered with an aluminum containing ceramic coating layer.
Claim 3
Dependent Claim
20 words
A multi-layer wiring board according to claim 1, wherein said ceramic coating layer comprises alumina, mullite, spinel or aluminum nitride.
Claim 4
Dependent Claim
24 words
A multi-layer wiring board according to claim 1, wherein said hollow or porous silica glass spheres comprise more then 90% by weight of silica.
Claim 5
Dependent Claim
33 words
A multi-layer wiring board according to claim 1, wherein said hollow or porous silica glass spheres are contained in the glass ceramic layers in an amount of not more than 50% by volume.
Claim 6
Dependent Claim
56 words
A multi-layer wiring board according to claim 1, wherein said glass ceramic has a softening temperature of 700° to 900 ° C., and said dispersed ceramic particles have an average particle size of not more than 10 μm and are contained in the glass ceramic layers in an amount of not less than 10% by volume.
Claim 7
Dependent Claim
16 words
A multi-layer wiring board according to claim 1, wherein said conductor patterns are formed from copper.
Claim 8
Dependent Claim
53 words
A multi-layer wiring board according to claim 1, wherein said multi-layer board further includes additional glass ceramic layers formed of the top and bottom surfaces of said glass ceramic layers, said additional glass ceramic layers containing glass and ceramic particles dispersed in the glass, but not containing hollow or porous silica glass spheres.
Claim 9
Dependent Claim
30 words
A multi-layer wiring board according to claim 7, wherein said additional glass ceramic layers are polished and circuit patterns are formed on polished surfaces of said additional glass ceramic layers.
Claim 10
Dependent Claim
80 words
A green sheet for use in preparing a glass ceramic material or a multi-layer wiring board comprising alternate layers of a glass ceramic material and conductor patterns, said green sheet comprising an unfired admixture of a glass powder, a ceramics powder and a multitude of ceramic particles dispersed in the admixture, said ceramic particles comprising hollow or porous silica glass spheres having an average diameter of not more than 20 μm are covered with an aluminum containing ceramic coating layer.
Claim 11
Dependent Claim
80 words
A green sheet for use in preparing a glass ceramic material or a multi-layer wiring board comprising alternate layers of a glass ceramic material and conductor patterns, said green sheet comprising an unfired admixture of a glass powder, a ceramics powder and a multitude of ceramic particles dispersed in the admixture, said ceramic particles comprising hollow or porous silica glass spheres having an average diameter of not more than 20 μm are covered with an aluminum containing ceramic coating layer.
References Cited (Backward Citations)
US3838998A
Cited
US3816107A
Cited
US4059423A
Cited
US4063916A
Cited
US4141055A
Cited
JPS5789212A
Cited
US4450184A
Cited
JPS5911345A
Cited
JPS59111345A
Cited
US4620264A
Cited
US4744831A
Cited
JPS6183674A
Cited
JPS61151063A
Cited
US4618525A
Cited
JPS6240791A
Cited
US4781968A
Cited
JPS63358A
Cited
JPS62206861A
Cited
JPS62287658A
Cited
US4821142A
Cited
JPS63107095A
Cited
JPS63151645A
Cited
US4917857A
Cited
US5021287A
Cited
JPH01179740A
Cited
US4983550A
Cited
JPH0283995A
Cited
US4906514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-03 | 1997-07-05 | 1998-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-03 | 2001-07-05 | 2002-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-03 | 2005-07-05 | 2006-01-04 | $7700.00 | Window Closed / Lapsed |