Patents by Inventor Wieland H. Sack

Wieland H. Sack 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 carrier material containing thermoplastic microspheres
    Patent number: 4133688
    Abstract: A photographic carrier material comprising a cellulose sheet which is coated on both surfaces with a polyolefin resin and in which hollow, thermoplastic microspheres are uniformly mixed therein in an amount of from 0.5 - 5.0 weight percent.
    Type: Grant
    Filed: July 8, 1977
    Date of Patent: January 9, 1979
    Assignee: Felix Schoeller, Jr.
    Inventor: Wieland H. Sack