Patent US5070046A successfully refreshed from Google Patents.
US5070046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric compositions
Assignee: EIDP Inc
•
Filing: 1989-10-19
•
Granted: 1991-12-03
•
Expires: 2009-10-19
Abstract
Abstract A composition for making dielectric layers having low dielectric constant, the composition comprising an admixture of finely divided solids comprising lead-free amorphous borosilicate glass and cordierite glass. The dielectric layers are useful in circuits, especially multilayers circuits for high density applications.
Inventors
- 👤 Yung-Haw Hu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:37
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; C; C03; C03C; C03C8/00; C03C8/22; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C8/14; H01B3/085; H01B3/087; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
131 words
A composition for making low K dielectric layers comprising a dispersion of finely divided solids comprising: (a) 20-50% by weight, basis total solids, lead-free amorphous borosilicate glass (1) in which the weight ratio of B 2 O 3 to SiO 2 is 0.22-0.55, and (2) containing, basis total borosilicate glass 94.5-98.3% by weight borosilicate, 0.5-1.5% by weight Al 2 O 3 , and 1.5-4.0% by weight, of alkali oxides of a mixture of alkali and alkaline earth oxides wherein the Li 2 O content of total solids is 0.3-1.0% by weight; (b) 30-80% by weight, basis total solids, cordierite glass; and (c) 0-40% by weight, basis total solids, of a ceramic filler selected from the group consisting of alumina, quartz, aluminum phosphate, aluminum nitride, boron nitride, fused silica, and mixtures thereof.
Claim 2
Dependent Claim
131 words
A composition for making low K dielectric layers comprising a dispersion of finely divided solids comprising: (a) 20-50% by weight, basis total solids, lead-free amorphous borosilicate glass (1) in which the weight ratio of B 2 O 3 to SiO 2 is 0.22-0.55, and (2) containing, basis total borosilicate glass 94.5-98.3% by weight borosilicate, 0.5-1.5% by weight Al 2 O 3 , and 1.5-4.0% by weight, of alkali oxides of a mixture of alkali and alkaline earth oxides wherein the Li 2 O content of total solids is 0.3-1.0% by weight; (b) 30-80% by weight, basis total solids, cordierite glass; and (c) 0-40% by weight, basis total solids, of a ceramic filler selected from the group consisting of alumina, quartz, aluminum phosphate, aluminum nitride, boron nitride, fused silica, and mixtures thereof.
Claim 3
Dependent Claim
25 words
The composition of claim 1 wherein the borosilicate glass (a) contains 0.9-3.0% by weight mixed Na 2 O and K 2 O, basis total glass.
Claim 4
Dependent Claim
38 words
The composition of claim 2 wherein the borosilicate glass (a) comprises on a weight basis, 72% SiO 2 , 25% B 2 O 3 , 1% K 2 O, 0.5% Li 2 O and 0.5% Na 2 O.
Claim 5
Dependent Claim
10 words
The composition of claim 1 wherein component (c) comprises quartz.
Claim 6
Dependent Claim
23 words
A tape casting composition comprising the composition of claim 1 dispersed in a solution of polymeric binder/plasticizer matrix in a volatile organic solvent.
Claim 7
Dependent Claim
23 words
A tape casting composition comprising the composition of claim 3 dispersed in a solution of polymeric binder/plasticizer matrix in a volatile organic solvent.
Claim 8
Dependent Claim
29 words
The tape casting composition of claim 5 wherein the binder component is selected from the group consisting of polymers of methyl methacrylate, ethyl methacrylate, methyl acrylate and mixtures thereof.
Claim 9
Dependent Claim
29 words
The tape casting composition of claim 6 wherein the binder component is selected from the group consisting of polymers of methyl methacrylate, ethyl methacrylate, methyl acrylate and mixtures thereof.
Claim 10
Dependent Claim
35 words
A tape prepared by casting a thin layer of the composition of claim 5 on a flexible substrate, heating the cast layer to remove volatile solvent therefrom and removing the solvent-free layer from the substrate.
Claim 11
Dependent Claim
35 words
A tape prepared by casting a thin layer of the composition of claim 7 on a flexible substrate, heating the cast layer to remove volatile solvent therefrom and removing the solvent-free layer from the substrate.
Claim 12
Dependent Claim
35 words
A tape prepared by casting a thin layer of the composition of claim 8 on a flexible substrate, heating the cast layer to remove volatile solvent therefrom and removing the solvent-free layer from the substrate.
Claim 13
Dependent Claim
13 words
A dielectric substrate comprising a fired layer of the tape of claim 9.
Claim 14
Dependent Claim
13 words
A dielectric substrate comprising a fired layer of the tape of claim 1.
Claim 15
Dependent Claim
13 words
A dielectric substrate comprising a fired layer of the tape of claim 4.
Claim 16
Dependent Claim
14 words
An assemblage comprising the dielectric substrate of claim 12 and an electrically functional layer.
Claim 17
Dependent Claim
14 words
An assemblage comprising the dielectric substrate of claim 13 and an electrically functional layer.
Claim 18
Dependent Claim
14 words
An assemblage comprising the dielectric substrate of claim 14 and an electrically functional layer.
Claim 19
Dependent Claim
20 words
A multilayer assemblage comprising a plurality of electrically functional layers separated by fired layers of the tape of claim 9.
Claim 20
Dependent Claim
20 words
A multilayer assemblage comprising a plurality of electrically functional layers separated by fired layers of the tape of claim 10.
Claim 21
Dependent Claim
20 words
A multilayer assemblage comprising a plurality of electrically functional layers separated by fired layers of the tape of claim 11.
References Cited (Backward Citations)
US4413061A
Cited
US4549621A
Cited
US4655864A
Cited
US4749665A
Cited
US4731347A
Cited
US4883705A
Cited
US4788046A
Cited
US4861646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-02 | 1995-06-03 | 1995-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-02 | 1999-06-03 | 1999-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-02 | 2003-06-03 | 2003-12-03 | $7700.00 | Window Closed / Lapsed |