Patents by Inventor Heinrich Wischemann

Heinrich Wischemann 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).

  • Process for vacuum forming a stud plate from a plastic sheet
    Patent number: 5707582
    Abstract: A process for producing a stud plate from plastic by vacuum forming uses a positive mold (21) in which these is held on the end face (32) of each stud (28), a flexible elastic disc which protrudes with a part (45) of its flexible length over the edge. A projection (22, 24) of a hollow stud is formed thereon. During demolding a part (44) of the disc lying radially further inwards bends upwards from the end face, so that the protruding part (45) yields and readily slides along the inner wall (49) of the previously molded hollow stud (11).
    Type: Grant
    Filed: July 6, 1995
    Date of Patent: January 13, 1998
    Inventor: Heinrich Wischemann