Patents by Inventor Richard Schellinger, Jr.

Richard Schellinger, Jr. 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).

  • Composition and process for printed circuit etching using a sulfuric acid solution containing hydrogen peroxide
    Patent number: 4401509
    Abstract: Compositions are provided suitable for the etching of printed circuits from a laminate of copper metal and an etch resistant backing at a low hydrogen peroxide concentration and at a low temperature. The etching composition contains sulfuric acid, hydrogen peroxide as the oxidant, thiosulfate ion to counteract the depressing effect of chloride ion on the etch rate, an unsaturated organic hydroxy compound to stabilize the hydrogen peroxide in the presence of copper, and an aminomethylenephosphonic acid.
    Type: Grant
    Filed: September 7, 1982
    Date of Patent: August 30, 1983
    Assignee: FMC Corporation
    Inventor: Richard Schellinger, Jr.