Patents by Inventor Villi Johansen

Villi Johansen 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).

  • Soil humidity meter
    Patent number: D250882
    Type: Grant
    Filed: November 15, 1976
    Date of Patent: January 23, 1979
    Assignee: Substral International, Pernille S.A.
    Inventor: Villi Johansen