Patents by Inventor John A. Payak

John A. Payak 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 of etching polyimide
    Patent number: 5350487
    Abstract: The present invention relates to methods of etching polyimide from a substrate and to the etched substrates prepared according to such methods. In one embodiment, the present invention provides a method of etching polyimide from a substrate, comprising the steps of: providing a basic bath; ultrasonically agitating said basic bath; exposing said substrate containing polyimide to said basic bath; rinsing said substrate with hot water; optionally repeating the aforementioned steps at least once; and recovering an etched substrate.
    Type: Grant
    Filed: May 3, 1993
    Date of Patent: September 27, 1994
    Inventors: Thomas J. Ameen, John A. Payak, Jerome M. Cangelosi