Patents by Inventor Hirofumi Imanaka

Hirofumi Imanaka 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).

  • Publication number: 20080155801
    Abstract: An electret condenser microphone includes a first electrode provided with an electret and a second electrode opposed to the first electrode with an air gap interposed. In manufacture of the electret condenser microphone, after degasification is performed on the inside of the air gap, water repellent finishing is performed on at least the inside of the air gap.
    Type: Application
    Filed: October 23, 2007
    Publication date: July 3, 2008
    Inventor: Hirofumi Imanaka