Patents by Inventor Gerhard Hoffacker

Gerhard Hoffacker 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 a cyanide-free solution of a gold compound that is suitable for galvanic gold baths
    Patent number: 6733651
    Abstract: A method for producing a cyanide-free solution of a gold compound that is suitable for gold electrodeposition baths. The method includes the steps of reacting at least one of a cysteine and a cysteinate with at least one of tetrachloroauric acid and a tetrachloroaurate in a first aqueous medium, separating a resulting precipitate from the first aqueous medium, and dissolving the precipitate in a second aqueous medium with elevation of the pH to 12.0-14.0.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: May 11, 2004
    Assignee: W. C. Heraeus GmbH & Co. KG
    Inventors: Gerhard Hoffacker, Renate Franz, Ramona Reitz, Richard Walter
  • Bath system for galvanic deposition of metals
    Patent number: 6620304
    Abstract: A bath system for galvanic deposition of metals includes a solution containing at least one metal, especially a precious metal and/or precious metal alloy in the form of a water-soluble salt, at least one water-soluble protein material or amino acid and/or at least one water-soluble sulfonic acid, at least one water-soluble nitro-containing substance, at least one water-soluble surface-active agent and at least one vitamin. The bath system galvanostatically applies high quality layers with uniform quality. The bath system can be kept free of harmful substances such as cyanides, sulfites and hard complexing agents.
    Type: Grant
    Filed: December 4, 2001
    Date of Patent: September 16, 2003
    Inventor: Gerhard Hoffacker