Patent US527508A successfully refreshed from Google Patents.
Patent US4425263A successfully refreshed from Google Patents.
US4425263A
Expired / Lapsed
US
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Flexible screen-printable conductive composition
Assignee: EIDP Inc
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Filing: 1981-11-02
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Granted: 1984-01-10
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Expires: 2001-11-02
Abstract
Abstract A screen-printable thick film conductor composition for membrane switches consisting of an active phase of conductive metal powder dispersed in an organic medium consisting essentially of a linear aromatic polyester resin dissolved in volatile solvent.
Inventors
- 👤 Nicholas Nazarenko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:41
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/78; H01H13/785; C; C09; C09D; C09D11/00; C09D11/02; C09D11/10; C09D11/102; C09D11/104; H01B; H01B1/00; H01B1/20; H01B1/22; H01B1/24; H01H13/702; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H05K1/095; H01H2201/00; H01H2201/022; H01H2201/026; H01H2209/00; H01H2209/024; H01H2209/03; H01H2209/068; H01H2209/074; H01H2229/00; H01H2229/002; H01H2229/004; H01H2229/018
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
A screen-printable composition consisting essentially of (a) 30-80% by weight finely divided particles of conductive material selected from the group consisting of silver, nickel, copper, carbon, iron, gold, platinum, palladium and mixtures and alloys thereof dispersed in (b) 70-20% by weight organic medium which is a solution of linear aromatic polyester resin having an intrinsic viscosity of 0.5 to 1 completely dissolved in a volatile nonhydrocarbon solvent having a boiling point of 150°-220° C., the weight ratio of resin to solvent being from 0.15 to 0.5.
Claim 2
Dependent Claim
86 words
A screen-printable composition consisting essentially of (a) 30-80% by weight finely divided particles of conductive material selected from the group consisting of silver, nickel, copper, carbon, iron, gold, platinum, palladium and mixtures and alloys thereof dispersed in (b) 70-20% by weight organic medium which is a solution of linear aromatic polyester resin having an intrinsic viscosity of 0.5 to 1 completely dissolved in a volatile nonhydrocarbon solvent having a boiling point of 150°-220° C., the weight ratio of resin to solvent being from 0.15 to 0.5.
Claim 3
Dependent Claim
12 words
The composition of claim 1 in which the conductive material is silver.
Claim 4
Dependent Claim
30 words
The composition of claim 1 in which the conductive material is a glass or organic polymer coated with a material selected from the group consisting of silver, copper and nickel.
Claim 5
Dependent Claim
18 words
The composition of claim 1 in which the intrinsic viscosity of the polyester resin is 0.6 to 0.85.
Claim 6
Dependent Claim
26 words
The composition of claim 1 in which the polyester resin is the polycondensation product of a C 2-4 alkylene glycol with either isopthalic or terephthalic acid.
Claim 7
Dependent Claim
13 words
The composition of claim 5 in which the polyester resin is poly(ethylene terephthalate).
Claim 8
Dependent Claim
18 words
The composition of claim 1 in which the solvent has a boiling range of 150° to 220° C.
Claim 9
Dependent Claim
12 words
The composition of claim 7 in which the solvent is carbitol acetate.
Claim 10
Dependent Claim
16 words
The composition of claim 8 in which the solvent is admixed with 1-methyl ethylene glycol butylether.
References Cited (Backward Citations)
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Cited
US3719610A
Cited
US3992212A
Cited
US3957694A
Cited
US3968056A
Cited
US4219448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |