US4477198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified resistive layer in thermal transfer medium having lubricating contact graphite coating
Assignee: IBM Information Products Corp
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Filing: 1982-06-15
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Granted: 1984-10-16
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Expires: 2002-06-15
Abstract
Abstract A thermal ribbon having a minute coating of graphite powder on the outer side of the resistive layer. The improved electrical interface with print electrodes reduces ribbon and printhead damage. The graphite also reduces friction and loosens material which builds-up at the printhead.
Inventors
- 👤 Patsy A. Bowlds
- 👤 David P. Dunn
- 👤 Rex D. Fathergill
- 👤 Hugh T. Findlay
- 👤 Donald W. Stafford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:47
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/3825; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
83 words
A transfer medium having a resistive layer to receive electrical current for generation of heat, a layer of marking material meltable by said heat on one side of said resistive layer, and graphite powder in minute, normally unmeasurable amounts coating the surface of said resistive layer opposite said one side and adhering substantially only by inherent surface effects between said graphite and the surface of said resistive layer, said graphite coating giving a silver appearance and providing lubrication and enhanced electrical current-flow parameters.
Claim 2
Dependent Claim
83 words
A transfer medium having a resistive layer to receive electrical current for generation of heat, a layer of marking material meltable by said heat on one side of said resistive layer, and graphite powder in minute, normally unmeasurable amounts coating the surface of said resistive layer opposite said one side and adhering substantially only by inherent surface effects between said graphite and the surface of said resistive layer, said graphite coating giving a silver appearance and providing lubrication and enhanced electrical current-flow parameters.
Claim 3
Dependent Claim
39 words
The transfer medium as in claim 1 in which said graphite is that graphite which remains after applying graphite to said surface opposite said one side and thoroughly rubbing said applied graphite with a soft cloth to capture graphite.
Claim 4
Dependent Claim
22 words
The transfer medium as in claim 1 in which said resistive layer consists essentially of a polycarbonate resin binder and carbon black.
Claim 5
Dependent Claim
22 words
The transfer medium as in claim 2 in which said resistive layer consists essentially of a polycarbonate resin binder and carbon black.
Claim 6
Dependent Claim
22 words
The transfer medium as in claim 1 in which said resistive layer consists essentially of a polyurethane resin binder and carbon black.
Claim 7
Dependent Claim
22 words
The transfer medium as in claim 2 in which said resistive layer consists essentially of a polyurethane resin binder and carbon black.
Claim 8
Dependent Claim
98 words
A transfer medium having a resistive layer consisting essentially of a polymeric resin binder and a conductive, particulate filler; a layer of marking material on one side of said resistive layer meltable by heat generated by electrical current introduced into said resistive layer; and graphite powder in minute, normally unmeasurable amounts coating said resistive layer on the side opposite said one side, and graphite powder adhering substantially only by inherent surface effects between said graphite powder and the surface of said resistive layer, said graphite coating giving a silver appearance and providing lubrication and enhanced electrical current-flow parameters.
Claim 9
Dependent Claim
98 words
A transfer medium having a resistive layer consisting essentially of a polymeric resin binder and a conductive, particulate filler; a layer of marking material on one side of said resistive layer meltable by heat generated by electrical current introduced into said resistive layer; and graphite powder in minute, normally unmeasurable amounts coating said resistive layer on the side opposite said one side, and graphite powder adhering substantially only by inherent surface effects between said graphite powder and the surface of said resistive layer, said graphite coating giving a silver appearance and providing lubrication and enhanced electrical current-flow parameters.
Claim 10
Dependent Claim
44 words
The transfer medium as in claim 7 in which said graphite powder is that graphite powder which remains after applying graphite powder to said surface opposite said one side and thoroughly rubbing said applied graphite powder with a soft cloth to capture graphite powder.
Claim 11
Dependent Claim
19 words
The transfer medium as in claim 7 in which said resin is polycarbonate and said filler is carbon black.
Claim 12
Dependent Claim
19 words
The transfer medium as in claim 8 in which said resin is polycarbonate and said filler is carbon black.
Claim 13
Dependent Claim
19 words
The transfer medium as in claim 7 in which said resin is polyurethane and said filler is carbon black.
Claim 14
Dependent Claim
19 words
The transfer medium as in claim 8 in which said resin is polyurethane and said filler is carbon black.
Claim 15
Dependent Claim
36 words
The transfer medium as in claim 9 also comprising an aluminum layer of thickness in the order of magnitude of 1000 angstroms contacting said resistive layer between said resistive layer and said layer of marking material.
Claim 16
Dependent Claim
36 words
The transfer medium as in claim 10 also comprising an aluminum layer of thickness in the order of magnitude of 1000 angstroms contacting said resistive layer between said resistive layer and said layer of marking material.
Claim 17
Dependent Claim
36 words
The transfer medium as in claim 11 also comprising an aluminum layer of thickness in the order of magnitude of 1000 angstroms contacting said resistive layer between said resistive layer and said layer of marking material.
Claim 18
Dependent Claim
36 words
The transfer medium as in claim 12 also comprising an aluminum layer of thickness in the order of magnitude of 1000 angstroms contacting said resistive layer between said resistive layer and said layer of marking material.
References Cited (Backward Citations)
US3097561A
Cited
US3002850A
Cited
US3276946A
Cited
US3359128A
Cited
US4117190A
Cited
US4277540A
Cited
US4213870A
Cited
US4103066A
Cited
US4188434A
Cited
EP0016320A2
Cited
US4253775A
Cited
US4269892A
Cited
US4310258A
Cited
US4320170A
Cited
US4384797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |