US4810420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thick film copper via-fill inks
Assignee: Lockheed Martin Corp
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Filing: 1986-10-02
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Granted: 1989-03-07
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Expires: 2006-10-02
Abstract
Abstract An improved copper via-fill ink for forming post-ups in a thick dielectric layer separating two patterned layers of copper conductor in a multilayer circuit assembly is provided. The via-fill ink comprises copper powder, a suitable organic vehicle and a glass frit consisting of a devitrifying glass and a vitreous glass. The devitrifying glass is a zinc-magnesium-barium-aluminum-zirconium-phosphosilicate glass and the vitreous glass is a barium-calcium-borosilicate glass.
Inventors
- 👤 Ashok N. Prabhu
- 👤 Kenneth W. Hang
- 👤 Simon M. Boardman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:34
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H01; H01B; H01B1/00; H01B1/14; H01B1/16; H05K1/03; H05K1/0306; H05K3/00; H05K3/46
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
181 words
A copper via-fill conductor ink comprising from about 55 to about 80 weight percent copper powder and from about 15 to about 30 weight percent glass frit which comprises (1) a major portion of devitrifying glass comprising, on a weight percent basis, (a) from about 15 to about 25 percent zinc oxide; (b) from about 10 to about 25 percent magnesium oxide; (c) from about 3 to about 12 percent barium oxide; (d) from about 5 to about 20 percent aluminum oxide; (e) from about 35 to about 50 percent silicon dioxide; (f) from about 0.5 to about 3 percent phosphorus pentoxide; and (g) from about 1 to about 5 percent zirconium silicate, and (2) a minor portion of vitreous glass comprising on a weight percent basis, (a) from about 40 to about 55 percent barium oxide; (b) from about 10 to about 15 percent calcium oxide; (c) from about 14 to about 25 percent boron trioxide; and (d) from about 13 to about 23 percent silicon dioxide; and from about 5 to about 25 weight percent of an organic vehicle.
Claim 2
Dependent Claim
181 words
A copper via-fill conductor ink comprising from about 55 to about 80 weight percent copper powder and from about 15 to about 30 weight percent glass frit which comprises (1) a major portion of devitrifying glass comprising, on a weight percent basis, (a) from about 15 to about 25 percent zinc oxide; (b) from about 10 to about 25 percent magnesium oxide; (c) from about 3 to about 12 percent barium oxide; (d) from about 5 to about 20 percent aluminum oxide; (e) from about 35 to about 50 percent silicon dioxide; (f) from about 0.5 to about 3 percent phosphorus pentoxide; and (g) from about 1 to about 5 percent zirconium silicate, and (2) a minor portion of vitreous glass comprising on a weight percent basis, (a) from about 40 to about 55 percent barium oxide; (b) from about 10 to about 15 percent calcium oxide; (c) from about 14 to about 25 percent boron trioxide; and (d) from about 13 to about 23 percent silicon dioxide; and from about 5 to about 25 weight percent of an organic vehicle.
Claim 3
Dependent Claim
92 words
The ink composition of claim 1 wherein the devitrifying glass comprises, on a weight basis, (a) from about 16 to about 22 percent of zinc oxide; (b) from about 16 to 22 percent of magnesium oxide; (c) from about 5 to about 10 percent of barium oxide; (d) from about 8 to about 11 percent of aluminum oxide; (e) from about 39 to about 43 percent of silicon dioxide; (f) from about 1 to about 2 percent of phosphorus pentoxide; and (g) from about 2 to about 3 percent of zirconium silicate.
Claim 4
Dependent Claim
59 words
The ink composition of claim 1 wherein the vitreous glass comprises, on weight basis, (a) from about 40 to about 55 percent of barium oxide; (b) from about 10 to about 15 percent of calcium oxide; (c) from about 14 to about 25 percent of boron trioxide; and (d) from about 13 to about 23 percent of silicon dioxide.
Claim 5
Dependent Claim
25 words
The ink composition of claim 1 wherein the weight to weight ratio of devitrifying glass to vitreious glass is from about 2:1 to about 20:1.
Claim 6
Dependent Claim
25 words
The ink composition of claim 1 wherein the weight to weight ratio of devitrifying glass to vitreous glass is from about 3:1 to about 5:1.
Claim 7
Dependent Claim
48 words
The ink composition of claim 1 wherein the amount of devitrifying glass is from about 70 to about 95 weight percent and the amount of vitreous glass is from about 5 to about 30 weight percent, based on the total weight of glass frit in the ink composition.
Claim 8
Dependent Claim
51 words
A copper via-fill conductor ink according to claim 1, wherein the ink comprises, on a weight basis: from about 60 to about 70 percent of copper powder; from about 18 to about 25 percent of the glass frit; and from about 15 to about 20 percent of the suitable organic vehicle.
Claim 9
Dependent Claim
24 words
A copper via-fill conductor ink according to claim 7, wherein the organic vehicle is a solution of an organic binder in a suitable solvent.
Claim 10
Dependent Claim
14 words
A copper via-fill conductor ink according to claim 8, wherein the binder is poly(isobutylmethacrylate).
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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) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |