US5021287A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic green sheets
Assignee: NGK Insulators Ltd
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Filing: 1988-12-16
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Granted: 1991-06-04
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Expires: 2008-12-16
Abstract
Abstract A ceramic green sheet comprises a green sheet as a core and a surface layer formed thereon. Such ceramic green sheets are laminated for use in IC package, printed circuit board or the like.
Inventors
- 👤 Tadashi Otagiri
- 👤 Masahiro Shirai
- 👤 Minoru Ohara
- 👤 Go Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:56
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/5194; C04B41/80; C04B41/81; C04B41/85; C04B41/88; H; H05; H05K; H05K3/00; H05K3/46; H05K3/4611; H05K3/4626; H05K3/4629; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/69; H10W70/692; C04B2111/00; C04B2111/00474; C04B2111/00844; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K1/09; H05K1/092; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/24942; Y10T428/26; Y10T428/266; Y10T428/31504; Y10T428/31551; Y10T428/31645; Y10T428/31649
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
77 words
A ceramic green sheet for use in laminating a metallized pattern between respective ceramic green sheets, wherein no gaps exist between portions of said metallized pattern, said ceramic green sheet comprising a green sheet as a core for maintaining a shape thereof and a green surface layer formed on at least one surface of said green sheet as a lamination assisting layer, wherein said green surface layer is more flexible than said green sheet as a core.
Claim 2
Dependent Claim
77 words
A ceramic green sheet for use in laminating a metallized pattern between respective ceramic green sheets, wherein no gaps exist between portions of said metallized pattern, said ceramic green sheet comprising a green sheet as a core for maintaining a shape thereof and a green surface layer formed on at least one surface of said green sheet as a lamination assisting layer, wherein said green surface layer is more flexible than said green sheet as a core.
Claim 3
Dependent Claim
34 words
The ceramic green sheet according to claim 1, wherein said green sheet as a core is formed by a doctor blade process and said surface layer is applied by means of a roll coater.
Claim 4
Dependent Claim
34 words
The ceramic green sheet according to claim 1, wherein a ceramic component of said green sheet as a core has substantially the same composition as that of a ceramic component of said surface layer.
Claim 5
Dependent Claim
23 words
The ceramic green sheet according to claim 1, wherein said green sheet as a core includes an acrylic resin as an organic binder.
Claim 6
Dependent Claim
20 words
The ceramic green sheet, according to claim 1, wherein said surface layer includes an acrylic resin as an organic binder.
Claim 7
Dependent Claim
33 words
The ceramic green sheet according to claim 1, wherein an amount of resin included in said surface layer is greater than an amount of resin included in said green sheet as a core.
Claim 8
Dependent Claim
33 words
The ceramic green sheet according to claim 1, wherein a resin included in said surface layer has a lower glass transition point than a resin included in said green sheet as a core.
Claim 9
Dependent Claim
25 words
The ceramic green sheet according to claim 1, wherein said surface layer is formed on both side surfaces of said green sheet as a core.
Claim 10
Dependent Claim
31 words
The ceramic green sheet according to claim 1, wherein said green sheet as a core has a thickness of 100-1200 μm and said surface layer has a thickness of 5-80 μm.
References Cited (Backward Citations)
US3575746A
Cited
US3725186A
Cited
US3998917A
Cited
US4046612A
Cited
US4207371A
Cited
US4110487A
Cited
US4401709A
Cited
US4396682A
Cited
US4536435A
Cited
US4624896A
Cited
US4582745A
Cited
US4632846A
Cited
US4767672A
Cited
US4806334A
Cited
US4656071A
Cited
US4677009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-03 | 1994-12-03 | 1995-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-03 | 1998-12-03 | 1999-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-03 | 2002-12-03 | 2003-06-04 | $7700.00 | Window Closed / Lapsed |