Patents by Inventor Robert Laurencelle

Robert Laurencelle 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).

  • Directory device and method of operation
    Patent number: 5035073
    Abstract: A secure directory device for displaying information on removable plates. The device includes a special key for removing and replacing plates, thereby precluding unauthorized tampering.
    Type: Grant
    Filed: January 2, 1990
    Date of Patent: July 30, 1991
    Inventor: Robert Laurencelle