Patents by Inventor Andre de Keyser

Andre de Keyser 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).

  • Patent number: 4806159
    Abstract: A plating activator composition that is largely silver is applied in a thin film to two surface areas of a ceramic chip capacitor. Subsequently, many such chip capacitors are electrolytically nickel plated, e.g. are electro-nickel barrel plated to provide two strongly adhered nickel terminals to the component. This activator composition consists essentially of at elast 85% Ag, from 0.1 to 7% Pd, from 1% to 10% of an element selected from Cu, Si, Bi, Zn, Fe, Ni, Sn, Zr, Nb, Sb, Mn and combinations thereof. These terminals are strong, truly conformal and are highly manufacturable.
    Type: Grant
    Filed: July 16, 1987
    Date of Patent: February 21, 1989
    Assignee: Sprague Electric Company
    Inventors: Andre De Keyser, Luc Naessens, Eddy Vincent
  • Patent number: 4160962
    Abstract: A delay-line has two essentially identical distributed parameter delay-line sections that have series connected solenoidal coils and mutually parallel axes. The winding directions of the two coils are such that an external observer traveling along the series connected coils from one free coil-end to the other will observe a winding direction reversal in going from one section to the other. Thus a uniform unidirectional magnetic field having a component parallel to the section axes will produce induced voltages in the two coils that are of opposite polarity and no net induced voltage will appear between the free ends of the series connected coils.
    Type: Grant
    Filed: November 4, 1977
    Date of Patent: July 10, 1979
    Assignee: Sprague Electric Company
    Inventors: Andre de Keyser, Laurent Seynaeve