Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B41
PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
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B41M
PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING,
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5/00
Duplicating or marking methods; Sheet materials for use therein
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B41M5/26
Thermography; ;; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
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B41M5/30
using chemical colour formers
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B41M5/333
Colour developing components therefor, e.g. acidic compounds
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B41M5/3333
Non-macromolecular compounds
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B41M5/3335
Compounds containing phenolic or carboxylic acid groups or metal salts thereof
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B41M5/3336
Sulfur compounds, e.g. sulfones, sulfides, sulfonamides
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