Patents by Inventor Bruce A. Bohnen

Bruce A. Bohnen 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).

  • Stabilized hydrogen peroxide compositions
    Patent number: 4915781
    Abstract: The present invention is directed to a hydrogen peroxide solution stabilized by ##STR1## wherein X is a linking group and Y is a metal cation or H which compound is soluble in hydrogen peroxide. In the second aspect of of the invention, a stabilized hydrogen peroxide solution contains a mineral acid which is suitable for etching a metal surface of a metal substrate such as a printed wiring board.
    Type: Grant
    Filed: July 27, 1988
    Date of Patent: April 10, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Bruce A. Bohnen, Kurt E. Heikkila, Rodney K. Williams
  • Hydrogen peroxide compositions containing a substituted oxybenzene compound
    Patent number: 4875972
    Abstract: The present invention is directed to a hydrogen peroxide solution stabilized by a substituted oxybenzene compound which is soluble in hydrogen peroxide. In a second aspect of the invention, a stabilized hydrogen peroxide solution contains a mineral acid which is suitable for etching a metal surface of a metal substrate such as a printed wiring board.
    Type: Grant
    Filed: July 27, 1988
    Date of Patent: October 24, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Rodney K. Williams, Bruce A. Bohnen, Kurt E. Heikkila
  • Hydrogen peroxide compositions containing a substituted aminobenzaldehyde
    Patent number: 4875973
    Abstract: The invention is directed to a hydrogen peroxide solution stabilized by a substituted aminobenzaldehyde compound which is soluble in hydrogen peroxide. The stabilized hydrogen peroxide solution contains a mineral acid which is especially useful for etching a surface of a substrate such as a printed wiring board.
    Type: Grant
    Filed: July 27, 1988
    Date of Patent: October 24, 1989
    Assignee: E. I. Du Pont De Nemours and Company
    Inventors: Kurt E. Heikkila, Rodney K. Williams, Bruce A. Bohnen
  • Method of making dialkylamino-thioxomethyl-thioalkanesulfonic acid compounds
    Patent number: 4667049
    Abstract: A method for the preparation of an alkali metal dialkylaminothioxomethyl-thioalkanesulfonate composition comprising reacting a monoamine with carbon disulfide to form a dithiocarbamic acid monoamine salt, reacting the salt with an alkyl sultone to form an amino thioxo methyl thioalkane sulfonate monoamine salt, and sulfonate salt with an alkali metal base to form an alkali metal salt of the amino thioxo methyl thioalkane sulfonate composition.
    Type: Grant
    Filed: February 27, 1986
    Date of Patent: May 19, 1987
    Assignee: ETD Technology Inc.
    Inventors: Kurt E. Heikkila, Rodney K. Williams, Bruce A. Bohnen, Russell J. Pylkki