Patents by Inventor Wolgang Himmelmann

Wolgang Himmelmann 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).

  • Process for hardening photographic gelatin with vinyl sulfones containing sulfonyl ethyl sulfate groups
    Patent number: 4543324
    Abstract: The difficulties in the casting process of photographic gelatin containing layers caused by increases in the viscosity of the casting solution due to the premature cross-linking of gelatin can be prevented if a compound containing at least one vinyl sulfone group and at least one sulfonyl ethyl sulfate group in the form of their salts is incorporated in the casting composition of the gelatin-containing layer(s) or in the gelatin-containing layer(s) applied to the layer support.
    Type: Grant
    Filed: September 26, 1984
    Date of Patent: September 24, 1985
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventor: Wolgang Himmelmann