Patent US4291994A successfully refreshed from Google Patents.
US4291994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tear resistant ribbon for non-impact printing
Assignee: IBM Information Products Corp
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Filing: 1980-03-27
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Granted: 1981-09-29
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Expires: 2000-03-27
Abstract
Abstract The present invention is concerned with a ribbon for non-impact printing. The ribbon comprises a transfer coating and a substrate containing resin which is a mixture of from 50% to 90% by weight polycarbonate and from 50% to 10% by weight of a block copolymer of bis-phenol A Carbonate and dimethyl siloxane, and containing from about 15% to about 40% by weight of the resin of electrically conductive carbon black.
Inventors
- 👤 Thor L. Smith
- 👤 William J. Weiche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:26
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/3825; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/325; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
71 words
A ribbon for non-impact printing comprising a transfer layer and a substrate which is a mixture of resin comprising from about 90% to about 50% by weight of polycarbonate and from about 10% to about 50% by weight of a block copolymer of bis-phenol A and dimethyl siloxane and based upon the total weight of the resin mixture from about 15% to about 40% by weight of electrically conductive carbon black.
Claim 2
Dependent Claim
71 words
A ribbon for non-impact printing comprising a transfer layer and a substrate which is a mixture of resin comprising from about 90% to about 50% by weight of polycarbonate and from about 10% to about 50% by weight of a block copolymer of bis-phenol A and dimethyl siloxane and based upon the total weight of the resin mixture from about 15% to about 40% by weight of electrically conductive carbon black.
Claim 3
Dependent Claim
32 words
A ribbon as claimed in claim 1 wherein the mixture of resin comprises about 75% by weight polycarbonate and about 25% by weight block copolymer of bis-phenol A carbonate and dimethyl siloxane.
Claim 4
Dependent Claim
21 words
A ribbon as claimed in claim 1 wherein carbon black is present at about 30% by weight of the resin mixture.
Claim 5
Dependent Claim
18 words
A ribbon as claimed in claim 1 wherein the substrate is from about 10 to 20 microns thick.
Claim 6
Dependent Claim
19 words
A ribbon as claimed in claim 1 wherein the transfer coating comprises wax or a resin and coloring matter.
Claim 7
Dependent Claim
54 words
A ribbon for non-impact thermal transfer printing comprising a transfer layer and a substrate of about 15 microns thickness which comprises a mixture of 75% by weight polycarbonate resin and 25% by weight block copolymer of bis-phenol A and dimethyl siloxane with about 30% by weight of the resin of electrically conductive carbon black.
Claim 8
Dependent Claim
54 words
A ribbon for non-impact thermal transfer printing comprising a transfer layer and a substrate of about 15 microns thickness which comprises a mixture of 75% by weight polycarbonate resin and 25% by weight block copolymer of bis-phenol A and dimethyl siloxane with about 30% by weight of the resin of electrically conductive carbon black.
References Cited (Backward Citations)
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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) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |