Patents by Inventor Harvey D. Keith

Harvey D. Keith 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).

  • Method for producing electret-containing devices
    Patent number: 4612145
    Abstract: A new method for fabricating electret-containing devices is disclosed. The inventive method includes a new technique for fabricating electrets, which involves applying a voltage across an electrically polarizable body. Large-scale breakdown effects in the body are avoided by reducing the voltage across at least a portion of the body undergoing polarization in response to a current indicating the onset of a breakdown in the body.
    Type: Grant
    Filed: March 26, 1984
    Date of Patent: September 16, 1986
    Assignee: AT&T Bell Laboratories
    Inventors: Harvey D. Keith, Heinz von Seggern, Tsuey T. Wang, James E. West