Patent US5250229A successfully refreshed from Google Patents.
US5250229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver-rich conductor compositions for high thermal cycled and aged adhesion
Assignee: EIDP Inc
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Filing: 1991-10-10
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Granted: 1993-10-05
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Expires: 2011-10-10
Abstract
Abstract The invention is directed to a thermal cycle adhesion additive composition consisting essentially of an admixture of finely divided particles of oxides of bismuth, copper, lead, zinc, and transition metal and to conductive thick film compositions made therefrom.
Inventors
- 👤 Hiroyuki Hara
- 👤 Marc H. La Branche
- 👤 Barry E. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:44
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/81; C04B41/85; C04B41/88; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/5183; H; H01; H01B; H01B1/00; H01B1/14; H01B1/16; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H10; H10W; H10W70/00; H10W70/01; H10W70/05; H10W70/098; H10W70/60; H10W70/62; H10W70/66; H10W70/666; C04B2111/00; C04B2111/00474; C04B2111/00844
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
119 words
A composition for making solderable electrically conductive layers comprising an admixture of finely divided particles containing by weight % (1) 85-99.9% of at least one solderable electrically conductive metal and (2) 15-0.1% of a additive composition consisting essentially of an admixture of finely divided particles of oxides or precursors of oxides of bismuth, copper, lead, zinc and a transition metal selected from iron, cobalt, nickel and mixtures thereof in which the weight ratio of (a) copper oxide to bismuth oxide and lead oxide is 0.01-2, (b) lead oxide to bismuth oxide and lead oxide is 0-1, (c) zinc oxide to bismuth oxide and lead oxide is 0.01-2, (d) transition metal oxide to bismuth oxide and lead oxide is 0.01-2.
Claim 2
Dependent Claim
119 words
A composition for making solderable electrically conductive layers comprising an admixture of finely divided particles containing by weight % (1) 85-99.9% of at least one solderable electrically conductive metal and (2) 15-0.1% of a additive composition consisting essentially of an admixture of finely divided particles of oxides or precursors of oxides of bismuth, copper, lead, zinc and a transition metal selected from iron, cobalt, nickel and mixtures thereof in which the weight ratio of (a) copper oxide to bismuth oxide and lead oxide is 0.01-2, (b) lead oxide to bismuth oxide and lead oxide is 0-1, (c) zinc oxide to bismuth oxide and lead oxide is 0.01-2, (d) transition metal oxide to bismuth oxide and lead oxide is 0.01-2.
Claim 3
Dependent Claim
21 words
The composition of claim 1 in which the weight ratio of copper oxide to bismuth oxide and lead oxide is 0.05-1.
Claim 4
Dependent Claim
21 words
The composition of claim 1 in which the weight ratio of zinc oxide to bismuth oxide and lead oxide is 0.05-1.
Claim 5
Dependent Claim
22 words
The composition of claim 1 in which the weight ratio of transition metal oxide to bismuth oxide and lead oxide is 0.05-1.
Claim 6
Dependent Claim
22 words
The composition of claim 1 in which a plurality of the oxides have been melted together prior to forming the particulate admixture.
Claim 7
Dependent Claim
14 words
The composition of claim 1 in which a plurality of the oxides are coprecipitated.
Claim 8
Dependent Claim
20 words
The composition of claim 1 in which the admixture is formed by spray drying an aqueous dispersion of the oxides.
Claim 9
Dependent Claim
31 words
The composition of claim 1 in which the admixture has been calcined at a temperature of at least 600° C., but below the temperature at which the oxides are completely molten.
Claim 10
Dependent Claim
14 words
The composition of claim 1 in which the transition metal oxide is iron oxide.
Claim 11
Dependent Claim
16 words
The composition of claim 1 in which the conductive metal is a single metal or alloy.
Claim 12
Dependent Claim
43 words
The composition of claim 1 in which the conductive metal is a plurality of metals or metal alloys of which at least one has a melting point at least 50° C. higher than the melting point(s) of the other metals or metal alloys.
Claim 13
Dependent Claim
25 words
The composition of claim 1 in which the metals or metal alloys are in the form of an admixture of metal or metal alloy particles.
Claim 14
Dependent Claim
20 words
The composition of claim 1 in which the metals or metal alloys are in the form of solid solution particles.
Claim 15
Dependent Claim
40 words
The composition of claim 1 in which the conductive metal is silver combined with up to 10% weight of at least one noble metal selected from the group consisting of Rh, Ru, Ir, Pt, Os, Re, Pd and mixtures thereof.
Claim 16
Dependent Claim
12 words
The composition of claim 14 in which the noble metal is Pt.
Claim 17
Dependent Claim
16 words
The composition of claim 1 in which the particulate admixture is dispersed in an organic medium.
Claim 18
Dependent Claim
18 words
The composition of claim 16 in which the organic medium is a matrix of volatilizable solid organic polymer.
Claim 19
Dependent Claim
27 words
The composition of claim 16 in which the organic medium is a liquid solution of organic polymer and nonvolatile solvent and the composition is of paste consistency.
Claim 20
Dependent Claim
83 words
A method for joining solder with electrically conductive metal or metal alloy layers comprising the sequential steps of: (1) applying a layer of the composition of claim 16 to the surface of an inorganic oxide-based substrate; (2) firing the applied layer to effect volatilization of the dispersion medium therefrom and sintering of the electrically conductive metal or metal alloy; (3) applying molten solder to the surface of the fired layer from step (2); and (4) cooling the applied solder to effect its solidification.
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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) | 1996-10-04 | 1997-04-05 | 1997-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-04 | 2001-04-05 | 2001-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-04 | 2005-04-05 | 2005-10-05 | $7700.00 | Window Closed / Lapsed |