Patents by Inventor Erwin Schon

Erwin Schon 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 composition
    Patent number: 4155764
    Abstract: A photographic color developer composition containing a color developer compound and an antioxidant wherein it contains a water-soluble enolizable .alpha.-aminocarbonyl compound as antioxidant is provided. Resistance to atmospheric oxygen of photographic color developer baths is improved.
    Type: Grant
    Filed: May 17, 1977
    Date of Patent: May 22, 1979
    Assignee: AGFA-Gevaert, A.G.
    Inventors: Arnfried Melzer, Erwin Schon