Patents by Inventor Karl Marbach

Karl Marbach 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).

  • Strip-shaped knife for use in punching machines and the like
    Patent number: 4729274
    Abstract: A punching tool wherein the knife is a strip of steel and has a cutting edge flanked by two mutually inclined concave facets. The facets are disposed between the cutting edge and two lateral surfaces which have concave portions adjacent the respective facets. Those portions of the knife which are disposed between the facets and the concave portions of the respective lateral surfaces are rounded.
    Type: Grant
    Filed: August 12, 1986
    Date of Patent: March 8, 1988
    Inventor: Karl Marbach
  • Machine tool for stamping and grooving
    Patent number: 4256026
    Abstract: A machine tool for stamping and grooving paperboard for forming folding blanks which includes a die plate of fiber-reinforced, hard paper provided with marginal edges, ribs and grooves formed by means of program-controlled tools and having alignment openings for receiving alignment pins, the die plate being adhesively secured to one of the machine stamping plates.
    Type: Grant
    Filed: April 30, 1979
    Date of Patent: March 17, 1981
    Assignee: Firma Karl Marbach GmbH
    Inventor: Karl Marbach