Patents by Inventor Lee Hamstra

Lee Hamstra 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).

  • Acoustic compensation chamber for a remotely located audio device
    Patent number: 10148800
    Abstract: An electronic device includes an internal microphone that is located remotely from a microphone aperture formed in the enclosure of the electronic device. An acoustic chamber is formed within the electronic device to couple the microphone to the microphone aperture. The acoustic chamber is designed with a particular length to volume ratio that amplifies a particular range of frequencies such that the microphone maintains equal sensitivity to a desired frequency band.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: December 4, 2018
    Assignee: Apple Inc.
    Inventors: Austin Frederickson, Timothy E. Sandrik, Mitchell Heschke, Lee Hamstra