Patents by Inventor Lawrence N. Tangeman

Lawrence N. Tangeman 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).

  • Patent number: 4019685
    Abstract: A mechanical cam-type apparatus is provided for ensuring even application of agricultural products or the like onto a field or the like from a moving vehicle notwithstanding variations from time to time in the ground speed of the vehicle. The apparatus includes a pair of opposed, yieldably biased-together cam members respectively coupled to the vehicle and spreading apparatus and separably rotatable in accordance with vehicle speed and the operational speed of the spreader; the cams are cooperatively configured and mounted for relative shifting movement caused by differences in the respective rotational speeds thereof, and means coupled between the cams and spreader motor is provided for variably operating the latter in response to the extent of cam shifting in order to automatically regulate spreader output in accordance with vehicle speed.
    Type: Grant
    Filed: October 31, 1975
    Date of Patent: April 26, 1977
    Assignee: Dempster Industries, Inc.
    Inventors: Lawrence N. Tangeman, Arthur Linsenmeyer
  • Patent number: D245331
    Type: Grant
    Filed: October 31, 1975
    Date of Patent: August 9, 1977
    Assignee: Dempster Industries, Inc.
    Inventor: Lawrence N. Tangeman