Patents by Inventor Martin J. Stewart

Martin J. Stewart 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).

  • Plastic scrap recovery apparatus
    Patent number: 4162880
    Abstract: A scrap recovery system for recovering scrap material from plastic articles such as plastic bottles. The system comprises a hammer mill for breaking the articles into a heterogeneous mixture of chips, a combination separator and sorter for separating the plastic chips from foreign objects and sorting the plastic chips into batches of chips of discrete homogeneous plastic material, a novel melter for melting the batches of homogeneous chips, and a pelletizer for reforming the molten material into solid marketable pellets.
    Type: Grant
    Filed: December 27, 1976
    Date of Patent: July 31, 1979
    Assignee: Nordson Corporation
    Inventors: Walter H. Cobbs, Jr., Martin J. Stewart