Patents by Inventor Harold E. Barnes

Harold E. Barnes 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).

  • Electroacoustic calling device with universal bearing supporting a sound aperture closure member
    Patent number: 4701749
    Abstract: An electroacoustic calling device comprising a piezoelectric transducer contained in a housing with an aperture therein through which sound is emitted. A closure member for controlling the size of the aperture, and hence the volume of emitted sound, is located in a recess in an arm pivotally mounted on the housing and is urged against the exterior surface of the housing by a projection at the bottom of the recess. The resulting essentially point contact between the closure member and the recess allows the surface of the closure member to align accurately with the surface of the housing, thereby minimizing leakage of sound between such surfaces.
    Type: Grant
    Filed: December 9, 1985
    Date of Patent: October 20, 1987
    Assignee: U.S. Philips Corporation
    Inventor: Harold E. Barnes