Patents by Inventor Louis R. Schaefer

Louis R. Schaefer 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).

  • Manually operated spreader
    Patent number: 4773568
    Abstract: A material spreader carried by the operator in one hand and operated by the same hand for oscillatory movement includes a hollow hopper, a spring-like carrying and operating handle attached to the hopper wall, and a material distributor mounted on the hopper exterior wall to receive material inertially ejected from the hopper through a gated aperture.
    Type: Grant
    Filed: November 27, 1987
    Date of Patent: September 27, 1988
    Inventor: Louis R. Schaefer