Patents by Inventor Ludwig Rebenfeld

Ludwig Rebenfeld 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).

  • Method of recovering constituents from polyester and cellulosic textile waste
    Patent number: 3937671
    Abstract: Textile wastes composed of blended polyester and cellulose fibers are subjected to the action of glacial acetic acid and acetic anhydride in the presence of a catalyst under conditions which serve to convert the cellulose component of the waste to cellulose acetate which is separated from the unreacted polyester component in the form of a solution adapted to be used in the manufacture of cellulose derivatives whereas the polyester is recovered in a form which may be garnetted to obtain a staple fiber for reuse.
    Type: Grant
    Filed: November 18, 1974
    Date of Patent: February 10, 1976
    Assignee: Textile Research Institute
    Inventors: Irving Gruntfest, Rudolph Turner, Ludwig Rebenfeld