US4880567A
Expired / Lapsed
US
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Thick film copper conductor inks
Assignee: Lockheed Martin Corp
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Filing: 1988-12-09
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Granted: 1989-11-14
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Expires: 2008-12-09
Abstract
Abstract Improved copper conductor inks useful in the fabrication of multilevel circuits are disclosed. The inks comprise copper powder, a devitrifying glass frit selected from a zinc-calcium-aluminum-silicate glass frit, a zinc-magnesium-barium-aluminum-silicate glass frit and mixtures thereof, an adhesion promoting oxide, and a suitable organic vehicle. These inks are particularly adapted for applications where superior adhesion between the copper conductor ink and the underlying substrate or dielectric film is required.
Inventors
- 👤 Ashok N. Prabhu
- 👤 Kenneth W. Hang
- 👤 Edward J. Conlon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:57
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/076; C03C3/097; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/5127; C04B41/80; C04B41/81; C04B41/85; C04B41/88; H01; H01B; H01B1/00; H01B1/14; H01B1/16; C04B2111/00; C04B2111/00474; C04B2111/00844
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
96 words
A copper conductor ink comprising, on a weight basis: (a) from about 65 to about 85 percent of copper powder; (b) from about 2 to about 10 percent of a devitrifying glass frit selected from the group consisting of a zinc-calcium-aluminum-silicate glass frit, a zinc-magnesium-barium-aluminum-silicate glass frit and mixtures thereof; (c) from about 1 to about 8 percent of an adhesion promoting oxide selected from the group consisting of bismuth oxide, cadmium oxide, cuprous oxide, thallium oxide, lead oxide and mixtures thereof; and (d) from about 5 to about 25 percent of a suitable organic vehicle.
Claim 2
Dependent Claim
96 words
A copper conductor ink comprising, on a weight basis: (a) from about 65 to about 85 percent of copper powder; (b) from about 2 to about 10 percent of a devitrifying glass frit selected from the group consisting of a zinc-calcium-aluminum-silicate glass frit, a zinc-magnesium-barium-aluminum-silicate glass frit and mixtures thereof; (c) from about 1 to about 8 percent of an adhesion promoting oxide selected from the group consisting of bismuth oxide, cadmium oxide, cuprous oxide, thallium oxide, lead oxide and mixtures thereof; and (d) from about 5 to about 25 percent of a suitable organic vehicle.
Claim 3
Dependent Claim
73 words
A copper ink in accordance with claim 1, wherein the ink comprises, on a weight basis: (a) from about 75 to about 80 percent of the copper powder; (b) from about 2.5 to about 5 percent of the glass frit; (c) from about 0.5 to about 5 percent bismuth oxide; (d) from about 0.5 to about 3 percent cuprous oxide; and (e) from about I2 to about 16 percent of the organic vehicle.
Claim 4
Dependent Claim
83 words
A copper ink in accordance with claim 2, wherein said zinc-calcium-aluminum-silicate glass frit comprises, on a weight basis: a) from about 7 to about 12 percent of zinc oxide; b) from about 25 to about 45 percent of calcium oxide; c) from about 10 to about 20 percent of aluminum oxide; d) from about 35 to about 50 percent of silicon dioxide; e) from 0 to about 2 percent of phosphorus pentoxide; and f) from 0 to about 5 percent of zirconium silicate.
Claim 5
Dependent Claim
83 words
A copper ink in accordance with claim 3, wherein said glass frit comprises, on a weight basis: a) from about 8 to about 10 percent of zinc oxide; b) from about 29 to about 38 percent of calcium oxide; c) from about 11 to about 18.5 percent of aluminum oxide; d) from about 37 to about 44 percent of silicon dioxide; e) from about 0.5 to about 1 percent of phosphorus pentoxide; and f) from about 2 to 3 percent of zirconium silicate.
Claim 6
Dependent Claim
93 words
A copper ink in accordance with claim 2, wherein said zinc-magnesium-barium-aluminum-silicate glass frit comprises, on a weight basis: a) from about 15 to about 25 percent of zinc oxide; b) fromabout 10 to about 25 percent of magnesium oxide; c) from about 3 to about 12 percent of barium oxide; d) from about 5 to about 20 percent of aluminum oxide; e) from about 35 to about 50 percent of silicon dioxide; f) from 0 to about 3 percent of phosphorus pentoxide; and g) from 0 to about 5 percent of zirconium silicate.
Claim 7
Dependent Claim
91 words
A copper ink in accordance with claim 5, wherein said glass frit comprises: a) from about 16 to about 22 percent of zinc oxide; b) from about 16 to about 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.
References Cited (Backward Citations)
US4376725A
Cited
US4415624A
Cited
US4385127A
Cited
US4574321A
Cited
US4521329A
Cited
US4623482A
Cited
US4816615A
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) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |