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US4309117A Expired / Lapsed US ⏱️ 0.0 years remaining

Ribbon configuration for resistive ribbon thermal transfer printing

Assignee: IBM Information Products Corp
•
Filing: 1979-12-26
•
Granted: 1982-01-05
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Expires: 1999-12-26
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Abstract

Abstract A resistive ribbon thermal transfer printing apparatus has an improved ribbon configuration. The ribbon contains a two-ply resistive element positioned on a conductive layer. The resistive element contains a top layer having a low resistance, for example 3x10-5 OMEGA for making contact with the writing head and a bottom layer having a higher resistance, for example 1x10-3 OMEGA in contact with the conductive layer for generating heat. The ratio of the resistance of the high resistance layer to the resistance of the low resistance layer, RH/RL, is 1.1 to 1000. An example of such a ribbon contains a top resistive layer of polyimide containing 35% conductive carbon, a bottom resistive layer of a SiO/Cr cermet (60%/40%), a stainless steel conductive layer and a Versamid ink layer.

Inventors

  • 👤 Leo S. Chang
  • 👤 Anthony DeMore

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 11:05
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/3825; B41J; B41J31/00; B41J31/05; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 66 words
A resistive ribbon for thermal transfer printing comprising a two layered resistive layer having a first layer and a second layer wherein the ratio of the resistance of the second layer to the resistance of the first layer, R second /R first , is 1.1 to 1000, a conducting layer positioned on said second resistive layer, and an ink transfer layer positioned on said conductive layer.
Claim 2
Dependent Claim 66 words
A resistive ribbon for thermal transfer printing comprising a two layered resistive layer having a first layer and a second layer wherein the ratio of the resistance of the second layer to the resistance of the first layer, R second /R first , is 1.1 to 1000, a conducting layer positioned on said second resistive layer, and an ink transfer layer positioned on said conductive layer.
Claim 3
Dependent Claim 22 words
A resistive ribbon as described in claim 1 wherein said first resistive layer contains a polymer and a conductive material dispersed therethrough.
Claim 4
Dependent Claim 16 words
A resistive ribbon as described in claim 1 wherein said second resistive layer is a cermet.
Claim 5
Dependent Claim 17 words
A resistive ribbon as described in claim 1 wherein said second resistive layer is a SiO/Cr cermet.
Claim 6
Dependent Claim 16 words
A resistive ribbon as described in claim 1 wherein said second resistive layer is silicon carbide.
Claim 7
Dependent Claim 15 words
A resistive ribbon as described in claim 1 wherein said conductive layer is stainless steel.
Claim 8
Dependent Claim 14 words
A resistive ribbon as described in claim 1 wherein said conductive layer is aluminum.
Claim 9
Dependent Claim 16 words
A resistive ribbon as described in claim 1 wherein said second resistive layer is aluminum oxide.
Claim 10
Dependent Claim 20 words
A resistive ribbon as described in claim 1 wherein said first resistive layer is in contact with a printing head.

References Cited (Backward Citations)

US3072543A Cited
US3377599A Cited
US3442699A Cited
US3744611A Cited
US4103066A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-01-04 1985-07-06 1986-01-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-01-04 1989-07-06 1990-01-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-01-04 1993-07-06 1994-01-05 $7700.00 Window Closed / Lapsed

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