Patents by Inventor Bradley M. Robbins

Bradley M. Robbins 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: 7421946
    Abstract: A two stage oil filter press having a housing with a precompression chamber and a main compression chamber together with a vertically reciprocating precompression ram and a horizontally reciprocating main compression ram powered by individual fluid cylinders. A feed chute with a scoop is raised through a void in the hopper created by a baffle which insures feeding a measured quantity of spent oil filters to the precompression chamber through a feed window. A main compression chamber is defined at the lower end of the precompression chamber by the lower horizontal end surface of the precompression ram, the floor, a pair of side walls of the precompression chamber, the thrust end of the main compression ram and a discharge door.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: September 9, 2008
    Inventors: John J. Pontus, Bradley M. Robbins