Patents by Inventor John W. Christensen

John W. 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).

  • Hair dryer
    Patent number: D255722
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: July 1, 1980
    Inventors: Sung Jae Shin, John W. Christensen, Paul S. Han