Patents by Inventor Lawrence D. Wren

Lawrence D. Wren 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).

  • Side delivery attachment for spreader truck
    Patent number: 4311408
    Abstract: A side delivery attachment for a spreader truck which converts it from a spreader to an apparatus for applying crushed rock in measured amounts accurately to a desired strip of the shoulder of a road.
    Type: Grant
    Filed: June 7, 1979
    Date of Patent: January 19, 1982
    Inventor: Lawrence D. Wren