Patent US5866240A successfully refreshed from Google Patents.
US5866240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thick ceramic on metal multilayer circuit board
Assignee: Sharp Corp
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Filing: 1997-03-06
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Granted: 1999-02-02
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Expires: 2017-03-06
Abstract
Abstract Multilayer green tape stacks having sufficient layers so that the fired stack is at least 2 millimeters in thickness on a metal support substrate are made by interleaving two types of green tapes comprising a low dielectric loss glass of a first type including at least 5% of an oxide filler and a green tape of a second type comprising a low dielectric loss glass and a higher amount of an oxide filler than the green tape of the first type, on a metal support substrate. These fired green tape stacks shrink on firing only in the thickness dimension.
Inventors
- 👤 Ashok Narayan Prabhu
- 👤 Ellen Schwartz Tormey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:22
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/16; H05K1/162; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/066; C03C3/07; C03C3/072; C03C3/074; C03C8/00; C03C8/02; C03C8/04; H01; H01C; H01C13/00; H01C13/02; H01C17/00; H01C17/30; H01C7/00; H01C7/003; H05K1/167; H10; H10W; H10W44/00; H05K1/02; H05K1/03; H05K1/0306; H05K1/09; H05K1/092; H05K3/00; H05K3/46; H05K3/4611; H05K3/4626; H05K3/4629; H05K3/4688; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24926; Y10T428/24942
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
79 words
A green tape stack comprising alternating layers of green tape of a first type comprising a mixture of crystallizing and non-crystallizing glasses together with 5 to 15% by weight of an oxide filler, with green tape layers of a second type containing a greater amount of oxide filler than the first type, said second type comprising a mixture of crystallizing and non-crystallizing glasses together with at least 25% by weight of an oxide filler onto a metal support surface.
Claim 2
Dependent Claim
79 words
A green tape stack comprising alternating layers of green tape of a first type comprising a mixture of crystallizing and non-crystallizing glasses together with 5 to 15% by weight of an oxide filler, with green tape layers of a second type containing a greater amount of oxide filler than the first type, said second type comprising a mixture of crystallizing and non-crystallizing glasses together with at least 25% by weight of an oxide filler onto a metal support surface.
Claim 3
Dependent Claim
41 words
A green tape stack according to claim 1 wherein said crystallizing glass includes 20-55% by weight of ZnO, from 10-30% by weight of MgO, from 10-35% by weight of B 2 O 3 and 10-40% by weight of SiO 2 .
Claim 4
Dependent Claim
22 words
A green tape stack according to claim 1 wherein said non-crystallizing glass includes PbO, Al 2 O 3 and SiO 2 .
Claim 5
Dependent Claim
55 words
A green tape stack according to claim 3 wherein said glass contains from 30-80% by weight of PbO, from 15-50% by weight of SiO 2 , up to 10% by weight of Al 2 O 3 , up to 15% by weight of B 2 O 3 and up to 10% by weight of ZnO.
Claim 6
Dependent Claim
26 words
A green tape stack according to claim 1 wherein said oxide filler is selected from the group consisting of alumina, cordierite, quartz, cristobalite, forsterite and willemite.
Claim 7
Dependent Claim
20 words
A green tape stack according to claim 1 wherein said metal support substrate is a copper clad Fe/Co/Ni alloy support.
Claim 8
Dependent Claim
26 words
A green tape stack according to claim 1 wherein a conductive layer is screen printed between one or more green tape layers of the first type.
Claim 9
Dependent Claim
16 words
A green tape stack according to claim 7 wherein said conductive layer is a silver-based layer.
Claim 10
Dependent Claim
22 words
A green tape stack according to claim 7 wherein a conductive layer is screen printed onto the top surface of the stack.
Claim 11
Dependent Claim
8 words
A fired green tape according to claim 1.
Claim 12
Dependent Claim
8 words
A fired green tape according to claim 6.
Claim 13
Dependent Claim
8 words
A fired green tape according to claim 7.
Claim 14
Dependent Claim
8 words
A fired green tape according to claim 8.
Claim 15
Dependent Claim
19 words
A fired green tape according to claim 1 wherein an RF component is embedded in the green tape stack.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-02-01 | 2002-08-03 | 2003-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-01 | 2006-08-03 | 2007-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-01 | 2010-08-03 | 2011-02-02 | $7700.00 | Window Closed / Lapsed |