Patents by Inventor Frits Rooij

Frits Rooij 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).

  • High voltage generator arrangement
    Patent number: 4011495
    Abstract: High voltage arrangement for an image intensifier with automatic brightness control, comprising a transistor oscillator including a transformer having a feedback winding, a voltage multiplier connected to the transformer and a control circuit, the control circuit including an auxiliary winding of said transformer connected in series with said feedback winding, and a control transistor connected as current source, the control transistor having its collector-emitter circuit connected through one or more diodes to said auxiliary winding.
    Type: Grant
    Filed: July 2, 1975
    Date of Patent: March 8, 1977
    Assignee: N. V Optische Industrie "De Oude Delft"
    Inventor: Frits Rooij