Patents by Inventor Martin Knopfli

Martin Knopfli 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).

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    Patent number: D538979
    Type: Grant
    Filed: September 16, 2005
    Date of Patent: March 20, 2007
    Inventors: Theo Grepper, Martin Knopfli
  • Helmet
    Patent number: D538980
    Type: Grant
    Filed: September 16, 2005
    Date of Patent: March 20, 2007
    Inventors: Theo Grepper, Martin Knopfli
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    Patent number: D540490
    Type: Grant
    Filed: September 16, 2005
    Date of Patent: April 10, 2007
    Inventors: Theo Grepper, Martin Knopfli
  • Helmet
    Patent number: D550902
    Type: Grant
    Filed: September 16, 2005
    Date of Patent: September 11, 2007
    Inventors: Theo Grepper, Martin Knopfli
  • Helmet
    Patent number: D575006
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: August 12, 2008
    Assignee: Plim Cooperation AG
    Inventor: Martin Knopfli