Patents by Inventor Johan Helder

Johan Helder 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).

  • Two-beam colorimeter
    Patent number: 4108555
    Abstract: A two-beam colorimeter comprising an incandescent lamp, a resistor connected electrically in series with the incandescent lamp, a condenser and an interference filter disposed in side by side relation adjacent said incandescent lamp, a two-hole diaphragm for developing a comparison light beam and a measuring light beam, a reference filter disposed in the path of the comparison light beam, and an adjusting filter movable into and out of the path of the measuring light beam.
    Type: Grant
    Filed: April 5, 1976
    Date of Patent: August 22, 1978
    Assignee: Siemens Aktiengesellschaft
    Inventors: Johan Helder, Hubert De Steur, Wolfgang Pernegger
  • Electroplating device for partially plating items in transit
    Patent number: 4070265
    Abstract: This invention relates to an electroplating device for partially plating a series of items moving along a path at a constant level, the device including at least one electroplating bath positioned along the path having end walls with slots therein through which the items to be plated may pass, and an end wall configuration adjacent the slot which combines with a circulation pump to maintain a constant liquid level in the bath above the bottom of the slot.
    Type: Grant
    Filed: December 1, 1975
    Date of Patent: January 24, 1978
    Assignee: Siemens Aktiengesellschaft
    Inventors: Laurent Danneels, Johan Helder, Jan Kuypers, James Piolon, Wolfgang Pernegger
  • Electroplating device and method for the partial metalizing of elements in continuous transit
    Patent number: 4035245
    Abstract: An electroplating device for partial plating of items in continuous transit through a plating bath. The bath includes an enclosure having slots for movement of the articles to be plated lengthwise of the bath. A cross flow of treatment liquid is maintained in the constant level bath through the provision of flow directing vanes, the flow being provided by a treatment liquid circulation pump.
    Type: Grant
    Filed: December 1, 1975
    Date of Patent: July 12, 1977
    Assignee: Siemens Aktiengesellschaft
    Inventors: Laurent Danneels, Johan Helder, Jan Kuypers, James Piolon, Wolfgang Pernegger
  • Electroplating device and method for the partial plating of two-row pin strips
    Patent number: 4032414
    Abstract: A device for the partial electro plating of two-row pin strips utilizing an endless chain of pin strip carrying transfer carriages to move the pin strips through a succession of treatment areas, the pin strips being automatically fed onto the carriages in electrical conductive contact therewith and being automatically stripped from the carriages upon termination of processing.
    Type: Grant
    Filed: December 1, 1975
    Date of Patent: June 28, 1977
    Assignee: Siemens Aktiengesellschaft
    Inventors: Johan Helder, Karl Holzinger, Gerd Guegel, Heinz Liebler, Wolfgang Pernegger