Radiation imagery chemistry: process – composition – or product th – Imaged product – Nonsilver image
Reexamination Certificate
2006-04-04
2006-04-04
Walke, Amanda (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Imaged product
Nonsilver image
C430S003000, C430S203000, C430S250000, C430S332000, C430S343000, C430S541000, C430S549000, C430S955000, C430S957000, C430S964000, C552S293000, C568S031000
Reexamination Certificate
active
07022441
ABSTRACT:
Silver-free, aqueous-based direct thermographic materials are designed to have image tone with near neutral density. Without the use of organic silver salts containing reducible silver ions, the image is formed using a color developing agent precursor that releases a color developing agent when heated to a temperature of at least 80° C., a combination of cyan, yellow and magenta dye-forming color couplers that provide cyan, yellow, and magenta dyes, and a substituted or unsubstituted benzoquinone as an oxidizing agent. No silver metal or silver ions are purposely added to these materials. This combination of components provides a means for controlling image tone without reliance upon conventional toning agents.
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U.S. Appl. No. 10/786,852, filed herewith, Maskasky et al., titled Black-And-White Thermographic Materials With Improved Image Tone.
U.S. Appl. No. 10/786,851, filed herewith, Maskasky et al., titled Silver-Free Black-And-White Thermographic Materials.
U.S. Appl. No. 10/786,827, filed herewith, Maskasky et al., titled Black-And-White Thermographic Material Containing Dye-Forming Chemistry.
Maskasky Joe E.
Scaccia Victor P.
Tucker J. Lanny
Walke Amanda
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