Patent US4079156A successfully refreshed from Google Patents.
US4079156A
Expired / Lapsed
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Conductive metal pigments
Assignee: Honeywell UOP LLC
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Filing: 1976-07-19
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Granted: 1978-03-14
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Expires: 1996-07-19
Abstract
Abstract Conductive metal pigments which may be used in electrical devices are prepared by forming an alloy of a non-noble conductive metal and at least one oxidizable material, mixing the resulting alloy with a vitreous frit and an organic vehicle to form an ink, screening said ink onto a substrate, firing the alloy in an air atmosphere at a temperature in excess of about 500° C. and cooling the ink to produce a conductive pigment. The oxidizable material is preferentially oxidized during the firing with a concomitant non-oxidation of the non-noble conductive metal.
Inventors
- 👤 Karl J. Youtsey
- 👤 Steven A. Bradley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:23
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/81; C04B41/85; C04B41/88; C04B41/009; C04B41/45; C04B41/50; C04B41/51; H; H01; H01B; H01B1/00; H01B1/14; H01B1/16; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06526; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
112 words
A process for the preparation of a conductive pigment coated surface which comprises alloying a non-noble conductive metal with at least one oxidizable material selected from the group consisting of carbon, boron, silicon, carbon-silicon, and boron-silicon, mixing the resulting alloy with a vitreous frit and an organic vehicle to form an ink, screening said ink onto a substrate, thereafter firing said ink in an oxidizing atmosphere containing at least 20% by volume of oxygen at a temperature in excess of about 500° C. for a period of time sufficient to oxidize said oxidizable material without oxidation of said non-noble metal, cooling the thus fired product to produce a conductive pigment coated surface.
Claim 2
Dependent Claim
112 words
A process for the preparation of a conductive pigment coated surface which comprises alloying a non-noble conductive metal with at least one oxidizable material selected from the group consisting of carbon, boron, silicon, carbon-silicon, and boron-silicon, mixing the resulting alloy with a vitreous frit and an organic vehicle to form an ink, screening said ink onto a substrate, thereafter firing said ink in an oxidizing atmosphere containing at least 20% by volume of oxygen at a temperature in excess of about 500° C. for a period of time sufficient to oxidize said oxidizable material without oxidation of said non-noble metal, cooling the thus fired product to produce a conductive pigment coated surface.
Claim 3
Dependent Claim
28 words
The process as set forth in claim 1 in which said alloy is fired at a temperature in the range of from about 700° to about 900° C.
Claim 4
Dependent Claim
16 words
The process as set forth in claim 1 in which said non-noble conductive metal is nickel.
Claim 5
Dependent Claim
16 words
The process as set forth in claim 1 in which said non-noble conductive metal is copper.
Claim 6
Dependent Claim
15 words
The process as set forth in claim 1 in which said oxidizable material is carbon.
Claim 7
Dependent Claim
15 words
The process as set forth in claim 1 in which said oxidizable material is silicon.
Claim 8
Dependent Claim
15 words
The process as set forth in claim 1 in which said oxidizable material is boron.
Claim 9
Dependent Claim
20 words
The process as set forth in claim 1 in which said oxidizable material is a combination of boron and silicon.
Claim 10
Dependent Claim
20 words
The process as set forth in claim 1 in which said oxidizable material is a combination of carbon and silicon.
Claim 11
Dependent Claim
15 words
The process as set forth in claim 1 in which said substrate is a ceramic.
Claim 12
Dependent Claim
17 words
The process as set forth in claim 1 in which the oxidizing atmosphere is an air atmosphere.
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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) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |