Patents by Inventor Louis S. Christensen

Louis S. Christensen 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).

  • Load carrying and lifting apparatus
    Publication number: 20040195789
    Abstract: A load carrying apparatus is supported on wheels and has a load-bearing member which is raised or lowered by a gear system operating a lead screw to raise and lower a load. Ground wheels are disposed on retractable arms to enable passage through restricted spaces and doorways.
    Type: Application
    Filed: April 2, 2004
    Publication date: October 7, 2004
    Inventor: Louis S. Christensen
  • Lighting crank stand
    Patent number: D475498
    Type: Grant
    Filed: April 5, 2002
    Date of Patent: June 3, 2003
    Inventor: Louis S. Christensen