Patent US4756756A successfully refreshed from Google Patents.
US4756756A
Expired / Lapsed
US
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Forming of thick-layer, hybrid electronic printed circuits
Assignee: Huntsman Advanced Materials Americas LLC
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Filing: 1985-02-26
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Granted: 1988-07-12
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Expires: 2005-02-26
Abstract
Abstract Thick-layer hybrid electronic printed circuits are formed by printing predetermined circuit pattern onto an insulating substrate by deposition of predetermined ink pattern thereupon, advantageously by silk-screening or masking, and thence baking said ink circuit pattern, and repeating the deposition/baking steps as required, the subject forming process featuring use of an insulating ink comprising a non-conductive metallic oxide extender, desirably cuprous oxide, which ink is thus either potentially conductive or potentially resistive, and the development of such conductivity or resistivity, after baking, by treating the ink pattern with a reducing agent, desirably a borohydride, as to readily and quantitatively convert said metal oxide into a conducting metal.
Inventors
- 👤 Robert Cassat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:25
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/105; H01; H01B; H01B1/00; H01B1/14; H01B1/16; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H05K1/097; H10; H10D; H10D84/00; H10D84/01; H05K2203/00; H05K2203/11; H05K2203/1157; H05K2203/12; H05K2203/125
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
72 words
An electrically insulating, potentially conductive ink composition adapted for deposition fabrication of thick-layer hybrid electronic printed circuits, comprising from about 40% to about 70% of a particulate cuprous oxide extender, from about 4% to about 10% of a particulate binder, and a diluent therefor, which binder is curable in a temperature range of from approximately 100° to 300° C., wherein the ink composition is insulating when baked and conductive when suitably reduced.
Claim 2
Dependent Claim
72 words
An electrically insulating, potentially conductive ink composition adapted for deposition fabrication of thick-layer hybrid electronic printed circuits, comprising from about 40% to about 70% of a particulate cuprous oxide extender, from about 4% to about 10% of a particulate binder, and a diluent therefor, which binder is curable in a temperature range of from approximately 100° to 300° C., wherein the ink composition is insulating when baked and conductive when suitably reduced.
Claim 3
Dependent Claim
92 words
An electrically insulating, potentially resistant ink composition adapted for deposition fabrication of thick-layer hybrid electronic printed circuits, comprising from about 30% to about 60% of a particulate extender admixture of from about 40% to about 60% particulate cuprous oxide and about 60% to about 40% particulate inert insulating extender, from about 10% to about 30% of a particulate binder, and a diluent therefor, which binder is curable in a temperature range of from approximately 100° to 300° C., wherein the ink composition is insulating when baked and is resistant if suitably reduced.
Claim 4
Dependent Claim
92 words
An electrically insulating, potentially resistant ink composition adapted for deposition fabrication of thick-layer hybrid electronic printed circuits, comprising from about 30% to about 60% of a particulate extender admixture of from about 40% to about 60% particulate cuprous oxide and about 60% to about 40% particulate inert insulating extender, from about 10% to about 30% of a particulate binder, and a diluent therefor, which binder is curable in a temperature range of from approximately 100° to 300° C., wherein the ink composition is insulating when baked and is resistant if suitably reduced.
Claim 5
Dependent Claim
26 words
The ink composition of claim 2, wherein said insulating extender is comprised of powdered glass, an alkali metal silicate, an alumina, a carbonate or a sulfate.
Claim 6
Dependent Claim
17 words
The ink composition of claims 1 or 2, wherein said binder is comprised of a thermosetting prepolymer.
Claim 7
Dependent Claim
44 words
The ink composition of claim 4, wherein the particle size of said extender(s) is in the range of from about 0.1 to about 5.0 microns and the particle size of said binder is in the range of from about 5 to about 40 microns.
Claim 8
Dependent Claim
27 words
The ink composition of claim 4, wherein said prepolymer is comprised of a polyimide resin reaction product of an unsaturated dicarboxylic acid N,N'-bis-imide with a primary polyamine.
Claim 9
Dependent Claim
28 words
The ink composition of claim 6, further comprising an adjuvant of one of a mono-imide, an ethylenically unsaturated polymerizable comonomer, an unsaturated polyester or an hydroxylated organosilicon compound.
Claim 10
Dependent Claim
23 words
The ink composition of claim 4, wherein said diluent is comprised of an ether of an alkanol or glycol, or a terpene alcohol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |