Patents by Inventor Harold P. Sorensen

Harold P. Sorensen 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).

  • Pneumatically operated reciprocating piston compressor
    Patent number: 5324175
    Abstract: A two stage free piston pneumatically operated air compressor having an integral and coaxial power piston, first stage piston and second stage piston. The discharge of the compressor first stage is the inlet for the compressor second stage. A piston-type throttling valve is used to control the speed of the reciprocating piston. The piston-type throttling valve is responsive to the pressure drop across a fixed orifice.
    Type: Grant
    Filed: May 3, 1993
    Date of Patent: June 28, 1994
    Assignee: Northern Research & Engineering Corporation
    Inventors: Harold P. Sorensen, Ward H. Robinson