Patent US4772574A successfully refreshed from Google Patents.
US4772574A
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Ceramic filled glass dielectrics
Assignee: General Electric Co
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Filing: 1987-11-12
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Granted: 1988-09-20
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Expires: 2007-11-12
Abstract
Abstract An improved dielectric ink for the fabrication of multilayer, copper-based integrated circuits is disclosed. The subject inks comprise a suitable ceramic filler material, an organic vehicle and a lead-zinc-aluminum-borosilicate glass frit. Dielectric layers formed from the subject inks are characterized by exceptional resistance to the penetration therein by flux materials such as PbO and Bi 2 O 3 from conventional copper conductors during repeated firings.
Inventors
- 👤 Kenneth W. Hang
- 👤 Ashok N. Prabhu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:55
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; C; C03; C03C; C03C8/00; C03C8/02; C03C8/10; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/085; H01B3/087; H01B3/12; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24926
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
132 words
A dielectric ink for multilayer integrated circuit fabrication on alumina substrates consisting essentially of, (a) from about 40 to about 65 percent by weight of a glass frit consisting of, on a weight basis: from about 7 to about 12 percent of lead oxide; from about 52 to about 53 percent of zinc oxide; from about 2 to about 5 percent of aluminum oxide; from about 25 to about 26 percent of boron trioxide; from about 6 to about 8 percent of silicon dioxide; from 0 to about 2 percent of antimony trioxide and from 0 to about 1 percent of cerium oxide; (b) from about 15 to about 40 percent by weight of a ceramic filler; and (c) from about 10 to about 30 percent by weight of an organic vehicle.
Claim 2
Dependent Claim
132 words
A dielectric ink for multilayer integrated circuit fabrication on alumina substrates consisting essentially of, (a) from about 40 to about 65 percent by weight of a glass frit consisting of, on a weight basis: from about 7 to about 12 percent of lead oxide; from about 52 to about 53 percent of zinc oxide; from about 2 to about 5 percent of aluminum oxide; from about 25 to about 26 percent of boron trioxide; from about 6 to about 8 percent of silicon dioxide; from 0 to about 2 percent of antimony trioxide and from 0 to about 1 percent of cerium oxide; (b) from about 15 to about 40 percent by weight of a ceramic filler; and (c) from about 10 to about 30 percent by weight of an organic vehicle.
Claim 3
Dependent Claim
36 words
A dielectric ink in accordance with claim 1, wherein the glass frit contains from about 0.1 to about 1.8 percent by weight antimony trioxide and from about 0.1 to about 0.6 percent by weight cerium oxide.
Claim 4
Dependent Claim
57 words
A dielectric ink in accordance with claim 1, wherein the glass frit consists essentially of about 9.7 weight percent lead oxide; about 52.5 weight percent zinc oxide; about 3.7 weight percent aluminum oxide; about 25.4 weight percent boron trioxide; about 7.3 weight percent silicon dioxide; about 1.1 percent antimony trioxide; and about 0.3 weight percent cerium oxide.
Claim 5
Dependent Claim
45 words
A dielectric ink in accordance with claim 1, the glass frit consisting essentially of about 10.9 weight percent lead oxide; about 52.6 weight percent zinc oxide; about 3.7 weight percent aluminum oxide; about 25.5 weight percent boron trioxide; and about 7.3 weight percent silicon dioxide.
Claim 6
Dependent Claim
34 words
A dielectric ink in accordance with claim 1, wherein the filler is selected from the group consisting of alumina, barium dimagnesium disilicate, dimagnesium borate, zirconium dilicate, dimagnesia silicate, dimagnesia dialumina pentasilicate and mixtures thereof.
Claim 7
Dependent Claim
29 words
A dielectric ink in accordance with claim 1, wherein the filler material is alumiina and barium dimagnesium disilicate in a weight ratio of from about 1:1 to about 1:5.
Claim 8
Dependent Claim
17 words
A dielectric ink in accordance with claim 1, wherein the organic vehicle is a solution of poly(isobutylmethacrylate).
Claim 9
Dependent Claim
75 words
A glass frit consisting essentially of from about 7 to about 10 weight percent lead oxide; from about 52 to about 53 weight percent zinc oxide; from about 2 to about 5 weight percent aluminum oxide; from about 25 to about 26 weight percent boron trioxide; from about 6 to about 8 weight percent silicon dioxide; from 0 to about 2 weight percent antimony trioxide and from 0 to about 1 weight percent cerium oxide.
Claim 10
Dependent Claim
75 words
A glass frit consisting essentially of from about 7 to about 10 weight percent lead oxide; from about 52 to about 53 weight percent zinc oxide; from about 2 to about 5 weight percent aluminum oxide; from about 25 to about 26 weight percent boron trioxide; from about 6 to about 8 weight percent silicon dioxide; from 0 to about 2 weight percent antimony trioxide and from 0 to about 1 weight percent cerium oxide.
Claim 11
Dependent Claim
54 words
A glass frit in accordance with claim 8, consisting essentially of about 9.7 weight percent lead oxide; about 52.5 weight percent zinc oxide; about 3.7 weight percent aluminum oxide; about 25.4 weight percent boron trioxide; about 7.3 weight percent silicon dioxide; about 1.1 weight percent antimony trioxide; and about 0.3 weight percent cerium oxide.
Claim 12
Dependent Claim
44 words
A glass frit in accordance with claim 8, comprising, on a weight basis: about 10.9 percent of lead oxide; about 52.6 percent of zinc oxide; about 3.7 percent of aluminum oxide; about 25.5 percent of boron trioxide; and about 7.3 percent of silicon dioxide.
References Cited (Backward Citations)
US3022179A
Cited
US3501322A
Cited
US4061584A
Cited
US4369254A
Cited
US4369220A
Cited
US4377642A
Cited
US4335216A
Cited
US4400214A
Cited
US4385127A
Cited
EP0084936A1
Cited
US4506026A
Cited
JPS59174544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |