Patents by Inventor Richard C. Li

Richard C. Li 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).

  • Sealed microphone assembly
    Patent number: 5365595
    Abstract: A sealed microphone assembly is disclosed including a microphone (120), a microphone housing (110) having a cavity (116) being resonant at an audio frequency range, and a sealing membrane (130). The sealing membrane 130 covers the cavity 116, thereby making the microphone assembly (100) fully sealed. The attenuation caused by sealing the microphone assembly (100) is compensated by the resonant characteristic of the cavity (116). The cavity (116) also includes one or more apertures (112) for creating a bandpass response.
    Type: Grant
    Filed: February 19, 1993
    Date of Patent: November 15, 1994
    Assignee: Motorola, Inc.
    Inventor: Richard C. Li