Patents by Inventor Raymond C. C. Ho

Raymond C. C. Ho 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).

  • Electronic compass apparatus and method
    Patent number: 6826843
    Abstract: An apparatus and method for determining the orientation of Earth's magnetic poles. A magnet is pivotally coupled to a support and is free to orient itself with Earth's magnetic pole. A detector is fixed relative to the support and outputs a signal indicative of the magnet orientation. A display displays an indication of the relative orientation of Earth's magnetic pole consistent with the output signal. Plural detectors can be employed to increase resolution of the apparatus. The detectors can be optical detectors. A shutter is fixed to the magnet and the detectors sense the shutter position. The shutter has a patterned formed thereon with transmissive portions and opaque portions. Shutter blinds are added to limit the dispersion of light.
    Type: Grant
    Filed: November 25, 2002
    Date of Patent: December 7, 2004
    Assignee: RadioShack, Corp.
    Inventors: Vincent M. T. Lam, Alan M. L. Lam, Raymond C. C. Ho