Patents by Inventor Dennis E. Francoeur

Dennis E. Francoeur 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).

  • High temperature hermetic switch
    Patent number: 4742195
    Abstract: A process instrument enclosed in a hermetically sealed housing for indicating and controlling a measured variable, such as the level in a tank. The instrument includes magnetically operated electrical switches actuable between open and closed positions in response to the measured variable. The electrical switches used are capable of switching current levels on the order of 10 Amps.
    Type: Grant
    Filed: December 2, 1985
    Date of Patent: May 3, 1988
    Assignee: Magnetrol International Incorporated
    Inventors: Cal L. Bryant, David W. Vrona, Dennis E. Francoeur, Paul G. Janitch