Patents by Inventor Jan Gronborg

Jan Gronborg 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).

  • Visor
    Patent number: D266795
    Type: Grant
    Filed: November 21, 1979
    Date of Patent: November 9, 1982
    Inventor: Jan Gronborg
  • Face protecting mask
    Patent number: D280460
    Type: Grant
    Filed: December 14, 1982
    Date of Patent: September 10, 1985
    Assignee: Svensk Sportutveckling AB
    Inventors: Jan Gronborg, Lars Persson
  • Face protecting mask
    Patent number: D282117
    Type: Grant
    Filed: July 26, 1983
    Date of Patent: January 14, 1986
    Assignee: Svensk Sportutveckling AB
    Inventors: Jan Gronborg, Lars Persson