Patent US5137848A successfully refreshed from Google Patents.
US5137848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric composition containing kerf additive
Assignee: EIDP Inc
•
Filing: 1990-12-13
•
Granted: 1992-08-11
•
Expires: 2010-12-13
Abstract
Abstract A dielectric composition comprising an admixture of finely divided particles of (a) 65-94 wt % of a non-reducing amorphous glass comprising of 15-27% ZnO, 8-30% alkaline earth metal oxides including 7-21% BaO, 40-60% SiO 2 , 3-14% Al 2 O 3 , 0-5% PbO and 0.5-5% of a metal oxide selected from ZrO 2 , up to 2.5% P 2 O 5 and mixtures thereof, the composition being crystallizable and non-reducing when fired at 850°-900° C. (b) 30-5 wt % of a metal oxide of Al 2 O 3 , ZrSiO 4 and mixtures thereof, (c) 1-5 wt % of a metal oxide kerf additive of CoAl 2 O 4 , Co/CrAl 2 O 4 , CoO, CoCr 2 O 4 , Cr 2 O 3 , TiO 2 , and mixtures thereof, where the sum of the components a and b does not exceed 35% by weight of the total particulate admixture, and (d) optionally, 1-10 wt % of either a TCE reducing additive of zircon, mullite, silica, and mixtures thereof or a TCE increasing additive of CaZrO 3 , quartz, α-cristobalite and mixtures thereof.
Inventors
- 👤 Michael F. Barker
- 👤 William A. Craig
- 👤 Paul C. Donohue
- 👤 Kenneth W. Hang
- 👤 Michael J. Haun
- 👤 Colin R. Pickering
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:08
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/14; C03C8/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
172 words
A dielectric composition comprising an admixture of finely divided particles of (a) 65-94% by weight of a non-reducing amorphous glass frit consisting essentially on a molar basis of 15-27% ZnO, 8-30% alkaline earth metal oxides selected from 7-21% BaO, 0-20% CaO, 0-12% SrO and mixtures thereof, 40-60% SiO 2 , 3-14% Al 2 O 3 , 0-5% PbO and 0.5-5% of a metal oxide selected from ZrO 2 , up to 2.5% P 2 O 5 and mixtures thereof, the composition being crystallizable and non-reducing when fired at 850°-900° C. (b) 30-5% by weight of a metal oxide selected from the group consisting of Al 2 O 3 , ZrSiO 4 and mixtures thereof, and (c) 1-5% by weight of a metal oxide kerf additive selected from the group consisting of CoAl 2 O 4 , Co/CrAl 2 O 4 , CoO, CoCr 2 O 4 , Cr 2 O 3 , TiO 2 and mixtures thereof, the sum of non-glass solids not exceeding 35% by weight of the total particulate admixture.
Claim 2
Dependent Claim
172 words
A dielectric composition comprising an admixture of finely divided particles of (a) 65-94% by weight of a non-reducing amorphous glass frit consisting essentially on a molar basis of 15-27% ZnO, 8-30% alkaline earth metal oxides selected from 7-21% BaO, 0-20% CaO, 0-12% SrO and mixtures thereof, 40-60% SiO 2 , 3-14% Al 2 O 3 , 0-5% PbO and 0.5-5% of a metal oxide selected from ZrO 2 , up to 2.5% P 2 O 5 and mixtures thereof, the composition being crystallizable and non-reducing when fired at 850°-900° C. (b) 30-5% by weight of a metal oxide selected from the group consisting of Al 2 O 3 , ZrSiO 4 and mixtures thereof, and (c) 1-5% by weight of a metal oxide kerf additive selected from the group consisting of CoAl 2 O 4 , Co/CrAl 2 O 4 , CoO, CoCr 2 O 4 , Cr 2 O 3 , TiO 2 and mixtures thereof, the sum of non-glass solids not exceeding 35% by weight of the total particulate admixture.
Claim 3
Dependent Claim
33 words
The composition of claim 1 which contains 1-10% by weight, basis total particulate admixture, of a TCE-reducing additive selected from the group consisting of ZrSiO 4 , mullite, SiO 2 and mixtures thereof.
Claim 4
Dependent Claim
33 words
The composition of claim 1 which contains 1-10% by weight, basis total particulate admixture, of a TCE-increasing additive selected from the group consisting of CaZrO 3 , quartz, alpha cristobalite and mixtures thereof.
Claim 5
Dependent Claim
12 words
The composition of any of claims 1-3 dispersed in an organic medium.
Claim 6
Dependent Claim
28 words
A screen-printable thick film dielectric composition comprising the composition of claim 4 in which the organic medium is comprised of a solution of organic polymer and non-volatile solvent.
Claim 7
Dependent Claim
22 words
A dielectric green tape comprising the composition of claim 4 in which the organic medium is a matrix of solid organic polymer.
References Cited (Backward Citations)
US3649353A
Cited
US3707499A
Cited
US3787219A
Cited
US4323652A
Cited
US4392180A
Cited
US4481261A
Cited
US4654095A
Cited
US4959330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |