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US 5,210,065 AGranted
Color-forming recording material
AssigneeMitsui Petrochemical Industries, Ltd.
InventorsMichio Tanaka, Koji Kawai, Hiroyoshi Tarumoto, Hisaya Miki, Keiki Kishikawa, Masato Kawamura, Masatoshi Nitabaru, Terunori Fujita
Life of this patent
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Abstract
A color-forming recording material containing: (a) an aromatic diamine, (b) an oxidizing agent such as a quinoid type electron-accepting compound, and (c) an acidic substance such as an aromatic carboxylic acid.
Claims13
A color-forming recording material having a substrate and containing:
- (a) an aromatic diamine,
- (b) an oxidizing agent, and
- (c) an acidic substance.
Dependencies are inferred from the claim text.