Patents by Inventor Stephen A. Frerichs

Stephen A. Frerichs 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).

  • Switchable diesel fuel filter assembly
    Patent number: 6991725
    Abstract: A switchable fuel filter assembly with alternate fuel paths which carry fuel, respectively, through alternate fuel filters depending on the position of a valve member.
    Type: Grant
    Filed: October 25, 2002
    Date of Patent: January 31, 2006
    Inventors: Stephen A. Frerichs, George H. Frerichs
  • Switchable diesel fuel filter assembly
    Publication number: 20040079695
    Abstract: A switchable fuel filter assembly with alternate fuel paths which carry fuel, respectively, through alternate fuel filters depending on the position of a valve member.
    Type: Application
    Filed: October 25, 2002
    Publication date: April 29, 2004
    Inventors: Stephen A. Frerichs, George H. Frerichs
  • Truck bed pull out step system
    Patent number: 5716064
    Abstract: A truck bed pull out step system installed under the front of a passenger pickup truck bed on one or both sides gives the user the ability to enter the pickup bed area or retrieve items with ease. When not in use is concealed under pickup bed.
    Type: Grant
    Filed: December 19, 1996
    Date of Patent: February 10, 1998
    Inventor: Stephen A. Frerichs