Patents by Inventor Josef Prasek

Josef Prasek 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).

  • Arrangement for electrospark working of internal conical surfaces of metal parts
    Patent number: 4363950
    Abstract: Arrangement for the electrospark working of internal conical surfaces of metal parts having a hollow space with a high slenderness ratio, terminating in a conical surface. The working electrode is guided in the hollow space of the workpiece and is provided with a simple and effective system of advance of the electrode, with the possibility of stoppage of the operation of the apparatus if due to some non-conductive dirt between the electrode and the worked surface correct operation is impossible, and with the provision of effective rinsing of the burning products.
    Type: Grant
    Filed: December 4, 1980
    Date of Patent: December 14, 1982
    Assignee: Motor Jihlava narodni podnik
    Inventors: Ludvik Mateja, Josef Prasek