Patents by Inventor Rene Alois Van Brandt

Rene Alois Van Brandt has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Fixer compositions used in planographic printing containing onium compounds
    Patent number: 4062682
    Abstract: A method for the preparation of a planographic printing plate wherein a sheet material comprising an outer hardenable hydrophilic colloid layer on whose surface is concentrated a visible silver image that has been formed thereon from silver halide complexes according to the silver complex diffusion transfer process, is treated with an aqueous lithographic fixer having a pH in the range of 1.0 to 6.5 and containing1. an iron(III) salt of a polyaminopolycarboxylic acid as oxidizing agent for the silver image,2. a compound yielding in dissolved state iodide ions as precipitating agent for silver ions, and3. an organic onium compound.
    Type: Grant
    Filed: July 29, 1975
    Date of Patent: December 13, 1977
    Assignee: AGFA-GEVAERT N.V.
    Inventors: Urbain Leopold Laridon, Rene Alois Van Brandt, Albert Lucien Poot