Patents by Inventor Garland E. Lee

Garland E. Lee 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).

  • System, method, and computer-readable medium for reduction of commutation-related acoustic noise in a fan system
    Patent number: 7279857
    Abstract: A method for reducing commutation-related acoustic noise in a fan system is provided. A constant frequency periodic signal is generated and a fan commutation event is synchronized with a zero level value of the constant frequency periodic signal. A system for controlling a direct current fan is provided. The system comprises a signal generator adapted to produce a periodic signal of a constant frequency and a phase-locked loop. A zero level value of the periodic signal is synchronized with a commutation event of the fan.
    Type: Grant
    Filed: August 27, 2003
    Date of Patent: October 9, 2007
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Samuel M. Babb, Jeffrey S. Weaver, James L. Yost, Garland E. Lee, Peter M. Piotrowski