Patents by Inventor Charles R. Schraeder

Charles R. Schraeder 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).

  • Piranha etch preparation having long shelf life and method of making same
    Patent number: 6294145
    Abstract: A method of formulating a strong oxidizing solution comprising formulating a strong oxidizing solution having from about 2 to about 5 percent PDSA with concentrated sulfuric acid in the ratio of from about 1:8 to about 1:20 parts by volume and storing the strong oxidizing solution in a container having a space over the solution containing one of a vacuum or a non-oxidizing atmosphere inert to the oxidizing solution. The amount of PDSA is preferably about 4 percent by volume and the ratio is preferably about 1:10 parts by volume. The space over the strong oxidizing solution is preferably a vacuum or substantially all nitrogen.
    Type: Grant
    Filed: November 8, 1994
    Date of Patent: September 25, 2001
    Assignee: Texas Instruments Incorporated
    Inventors: Lindsey H. Hall, Charles R. Schraeder, Jennifer A. Sees