Patents by Inventor John Ulrick

John Ulrick 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).

  • Output stage for high power class D amplifiers
    Patent number: 6304137
    Abstract: An output stage for a class D amplifier reduces distortion and EMI, and greatly improves the efficiency. The output stage employs a combination of techniques including a soft switching network, multiple output inductors and beads to achieve, a high power full range class D amplifier that is complies with all FCC and CE specifications with greater than 90% efficiency at ⅓ power.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: October 16, 2001
    Assignee: Red Chip Company Limited
    Inventors: Stuart W. Pullen, John Ulrick, Michael M. Walters