Patent US4808372A successfully refreshed from Google Patents.
Patent US5110384A successfully refreshed from Google Patents.
US5110384A
Expired / Lapsed
US
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Process for making electrically conductive patterns
Assignee: EIDP Inc
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Filing: 1990-04-17
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Granted: 1992-05-05
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Expires: 2010-04-17
Abstract
Abstract A process for making an electrically conductive pattern on a substrate including forming a patterned adhesive layer on the substrate, applying a conductive metal powder to the adhesive layer, and in a second coating pass, applying a powder containing supplementary elements to the pattern. The patterned substrate is fired to volatilize theadhesive layer and sinter the powders. This process can be used to make printed circuits on ceramic substrates which are useful in hybrid circuits, for example.
Inventors
- 👤 Dietmar Dudek
- 👤 Thomas Pfeiffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:28
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/05; H05K3/00; H05K3/10; H05K3/102; G; G03; G03F; G03F7/00; G03F7/26; G03F7/28; H05K1/0306; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0347; H05K2203/00; H05K2203/05; H05K2203/0502; H05K2203/0525; H05K2203/11; H05K2203/1131; H05K3/38
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
A process for making an electrically conductive pattern on a substrate comprising: (a) forming on the substrate a patterned adhesive layer that is at least temporarily tacky; (b) applying a powder comprising metal to the patterned adhesive layer; (c) applying to the metal-containing powder pattern a second powder comprising a supplementary element or a mixture of supplementary elements wherein the supplementary elements are selected from the group consisting of bismuth, cadmium, lead, copper, boron, rhodium, nickel, indium, aluminum, and silicon; and (d) firing the patterned substrate at a temperature and time sufficient to remove the adhesive layer and sinter the powders.
Claim 2
Dependent Claim
101 words
A process for making an electrically conductive pattern on a substrate comprising: (a) forming on the substrate a patterned adhesive layer that is at least temporarily tacky; (b) applying a powder comprising metal to the patterned adhesive layer; (c) applying to the metal-containing powder pattern a second powder comprising a supplementary element or a mixture of supplementary elements wherein the supplementary elements are selected from the group consisting of bismuth, cadmium, lead, copper, boron, rhodium, nickel, indium, aluminum, and silicon; and (d) firing the patterned substrate at a temperature and time sufficient to remove the adhesive layer and sinter the powders.
Claim 3
Dependent Claim
28 words
The process of claim 1, characterized in that the layer that is at least temporarily tacky is a light-sensitive layer that changes in tackiness on exposure to light.
Claim 4
Dependent Claim
14 words
The process of claim 2, characterized in that the light-sensitive layer contains 1,4-dihydropyridine compounds.
Claim 5
Dependent Claim
15 words
The process of claim 1, characterized in that the metal-containing powder contains no supplementary elements.
Claim 6
Dependent Claim
32 words
The process of claim 4, characterized in that the metal is a conductive metal selected from the group consisting of pure gold, silver, platinum, palladium, and copper and mixtures and alloys thereof.
Claim 7
Dependent Claim
32 words
The process of claim 5, characterized in that the supplementary element(s) in the second powder is/are selected from the group consisting of bismuth, cadmium, lead, rhodium, copper, nickel, boron, aluminum, and silicon.
Claim 8
Dependent Claim
20 words
The process of claim 6, characterized in that the second powder consists of metallic bismuth, cadmium, lead, boron, and/or rhodium.
Claim 9
Dependent Claim
22 words
The process of claim 6, characterized in that the second powder contains oxides or salts of bismuth, cadmium, lead, boron, and/or rhodium.
Claim 10
Dependent Claim
23 words
Process as in claim 6, characterized in that the second powder is a glass powder containing oxides of silicon, lead, aluminum, and/or boron.
References Cited (Backward Citations)
US3935366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-05 | 1995-11-04 | 1996-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-05 | 1999-11-04 | 2000-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-05 | 2003-11-04 | 2004-05-05 | $7700.00 | Window Closed / Lapsed |