Patents by Inventor Leon Dewallens

Leon Dewallens 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).

  • Method for manufacturing substantially flat dies
    Patent number: 4187154
    Abstract: There is described a method for manufacturing by electroplating substantially flat dies or similar, which comprises adjusting the electric current strength by varying the sparing between the cathode and the anode inside the electrolyte proper.
    Type: Grant
    Filed: August 2, 1978
    Date of Patent: February 5, 1980
    Assignee: Fabrication Belge de Disques "Fabeldis"
    Inventor: Leon Dewallens
  • Device for manufacturing substantially flat dies
    Patent number: 4120771
    Abstract: There is described a method for manufacturing by electroplating substantially flat dies or similar, which comprises adjusting the electric current strength by varying the sparing between the cathode and the anode inside the electrolyte proper.
    Type: Grant
    Filed: September 7, 1977
    Date of Patent: October 17, 1978
    Assignee: Fabrication Belge de Disques "Fabeldis"
    Inventor: Leon Dewallens
  • Method for making a metal master for producing a gramophone record
    Patent number: 4118287
    Abstract: There is described a method for making a metal master for producing a gramophone record provided with writing in the center thereof, particularly inside a pressure press, and according to which the engraving of the sound-grooves is obtained from a mold element which is prepared by galvanically plating metal on a non-conductive support which has been engraved previously, in which means are provided to prepare an etching on the center part of the non-conductive support, on which support is then performed the galvanic metal plating to form the one mold element for producing one record side.
    Type: Grant
    Filed: May 2, 1977
    Date of Patent: October 3, 1978
    Assignee: Fabrication Belge de Disques "Fabeldis"
    Inventor: Leon Dewallens