Patents by Inventor Max Heilmann

Max Heilmann 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).

  • Photographic color developer mixture
    Patent number: 3994730
    Abstract: An aqueous alkaline developer mixture for preparing color photographic images containing a color developer of the p-phenylenediamine series a hydroxylamine compound and a hydroxyalkylidenediphosphonic acid or a water soluble salt of the said acid and at least a compound of the aminopolyphosphonic acid or of the aminopolycarboxylic acid series with improved resistance to oxidation and resistance to the formation of chalk deposits and high stability in storage.
    Type: Grant
    Filed: September 17, 1973
    Date of Patent: November 30, 1976
    Assignee: AGFA-Gevaert, A.G.
    Inventors: Karl Frank, Max Heilmann
  • Process for bleach-fixing chromogenically color photographic silver halide material
    Patent number: 3942984
    Abstract: Color film of the silver halide emulsion type is developed by a process which includes a bleach-fixing bath treatment to remove the silver image, followed by an oxidizing bath to restore to the dyes the color which they lost in the bleach-fixing bath. This oxidizing bath must contain an iron-III-complex of an amino polyacetic acid as the oxidizing agent, e.g. the sodium-salt of the iron-III-complex of ethylene diamine tetra-acetic acid.
    Type: Grant
    Filed: March 12, 1973
    Date of Patent: March 9, 1976
    Assignee: AGFA-Gevaert Aktiengesellschaft
    Inventor: Max Heilmann