Patents by Inventor F. B. Ruben

F. B. Ruben 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 the production of a support material for light-sensitive materials with an anti-curl layer
    Patent number: 4977065
    Abstract: There is described a waterproof support material for light-sensitive materials with an anti-curl layer applied in two successive coatings on the reverse side.With the first coating, gelatin is dried out from the sol form and hardened in such a manner that, after the drying of the first coating, the second coating, which contains additional hardening agent, can be applied immediately without difficulty. Chromium(III)-salts are contained in both coatings as hardening agents.Through the selected combination of 2 process steps, anti-curl layers of extremely low water absorption capacity are obtained.
    Type: Grant
    Filed: June 30, 1988
    Date of Patent: December 11, 1990
    Assignee: Felix Schoeller Jr. GmbH & Co. KG
    Inventors: Frits B. Ruben, F. B. Ruben