Patents by Inventor Adolf Kuster

Adolf Kuster 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 opener
    Patent number: 4069585
    Abstract: A letter opener with a grip-type handle, a blade and a guide slot, wherein a lamellar blade pivots about its inner end and faces downward relative to the guide slot through which it penetrate into a slit aperture along one edge. The blade runs between the legs of a lamellar spring which is bent into a U-configuration and counters the pivot motion of the blade which has at both frontal corners a cutting face with ground edge facing downward relative to the base of the guide slot.
    Type: Grant
    Filed: October 5, 1976
    Date of Patent: January 24, 1978
    Inventor: Adolf Kuster