Patents by Inventor La Dorna E. Eichenberg

La Dorna E. Eichenberg 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).

  • Letter stamping machine
    Patent number: D257777
    Type: Grant
    Filed: July 28, 1977
    Date of Patent: January 6, 1981
    Inventors: Robert J. Eichenberg, La Dorna E. Eichenberg
  • Letter stamping machine
    Patent number: D296565
    Type: Grant
    Filed: January 30, 1986
    Date of Patent: July 5, 1988
    Inventors: Robert J. Eichenberg, La Dorna E. Eichenberg