Patents by Inventor Matthew J. Rollberg

Matthew J. Rollberg 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).

  • Rake classifier
    Patent number: 4853115
    Abstract: A rake classifier provides reciprocating movement using crank-mounted drive shafts to establish translatory forward movement as well as lifting and rearward movement of the rake structure.
    Type: Grant
    Filed: July 20, 1988
    Date of Patent: August 1, 1989
    Assignee: Dorr-Oliver Incorporated
    Inventors: George W. Kennel, Matthew J. Rollberg