Patents by Inventor Janusz Butkiewicz

Janusz Butkiewicz 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 and apparatus for simulating a surface photo-voltage in a substrate
    Patent number: 6388455
    Abstract: This invention relates to a method and apparatus for simulating a surface photo-voltage, more particularly with a photodiode on a process sized disk for calibrating surface photo-voltage measurement devices. The device for simulating a surface photo-voltage includes the photodiode, the disk, a resistor, and may further include an operational amplifier. The apparatus for simulating a surface photo-voltage of the current invention facilitates calibration of surface photo-voltage measurement devices by using a process sized disk to fit directly on a surface photo-voltage measurement chuck.
    Type: Grant
    Filed: January 13, 2000
    Date of Patent: May 14, 2002
    Assignee: QC Solutions, Inc.
    Inventors: Emil Kamieniecki, Krzysztof E. Kamieniecki, Jeffrey L. Sauer, Janusz Butkiewicz