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Production of azo dyestuff images from n-acyl-n-aryl hydrazine developers

  • US 2,498,418 A
  • Filed: 05/18/1948
  • Issued: 02/21/1950
  • Est. Priority Date: 05/18/1948
  • Status: Expired due to Term
First Claim
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1. THE PROCESS OF PRODUCING AZO DYESTUFF IMAGES IN A PHOTOGRAPHIC ELEMENT WHICH COMPRISES DEVELOPING A REDUCIBLE SILVER SALT IMAGE SELECTED FROM THE CLASS CONSISTING OF REDUCIBLE SILVER HALIDE AND SILVER FERROCYANIDE WITH AN ASYMMETRICAL NACYL-N-ARYL HYDRAZINE IN WHICH A TERMINAL GROUP IS PRIMARY AMINO WHILE REACTING THE OXIDATION PRODUCTS PRODUCED FROM SAID N-ACYL-ARYL-HYDRAZINE BY SUCH DEVELOPMENT WITH A NON-QUINONE-FORMING PHENOL AS AN AZO DYE COUPLING COMPONENT TO PRODUCE AN AZO DYESTUFF IN SITU WITH THE RESULTING METAL IMAGE.

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