Patents by Inventor Fred Napetschnig

Fred Napetschnig 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).

  • Portable material hardness tester
    Patent number: 4245496
    Abstract: A portable hardness tester including a surface sensing member yieldably mounted for engagement with the surface of material to be tested and a penetrator yieldably mounted adjacent the sensing member for joint contact with the surface; manually applied means for applying minor and major penetrating forces on the penetrator; and electronic means for sensing the differential movement between the penetrator and surface sensing member and translating such differential movement into a hardness indication.
    Type: Grant
    Filed: July 13, 1979
    Date of Patent: January 20, 1981
    Inventor: Fred Napetschnig