Patents by Inventor Helmuth Kirschner

Helmuth Kirschner 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 evening out the amount of material removed from discs in polishing
    Patent number: 4270316
    Abstract: In conventional polishing machines, uneven transmission of pressure causes ifferent degrees of abrasion of the polished discs which results in different thicknesses over one disc and also with respect to other discs in one polishing batch. This problem is solved according to the invention by the provision of soft elastic inserts between the pressure piston and the back of the carrier plate on which the discs to be polished are cemented.
    Type: Grant
    Filed: February 23, 1979
    Date of Patent: June 2, 1981
    Assignee: Wacker-Chemitronic Gesellschaft fur Elektronik-Grundstoffe mbH
    Inventors: Hans Kramer, Helmuth Kirschner