Patents by Inventor Willi Freppon

Willi Freppon 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).

  • Thermoelement for measurement of temperature in vacuum furnaces
    Patent number: 4717787
    Abstract: A thermoelement which rapidly determines temperature and which is protected from disturbing signals during the measurement of temperature in a vacuum furnace composed of a thermocouple which is protectively sheathed by a transparent quartz glass portective tubing pipe which has wrapped around it a continuous conductive metal element which is grounded.
    Type: Grant
    Filed: August 4, 1986
    Date of Patent: January 5, 1988
    Assignee: Degussa Aktiengesellschaft
    Inventors: Willi Freppon, Paul Heilmann, Theo van Heijst