Patents by Inventor Mark E Collins

Mark E Collins 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).

  • Digital noise reduction for motors
    Patent number: 7231139
    Abstract: A system and method for reducing fan noise by controlling the drive current to the fan motor. In one embodiment the system approximates a linear drive using a number of transistors in parallel and sequentially deploying the transistors. In another embodiment, a scheme is used to activate and deactivate transistors in discrete steps thereby achieving the benefits of the linear controller topology.
    Type: Grant
    Filed: September 29, 2005
    Date of Patent: June 12, 2007
    Assignee: Asahi Kasei Microsystems Co., Ltd.
    Inventors: Mark E Collins, Sumner B Marshall, III