Patents by Inventor Andreas Linhard

Andreas Linhard 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).

  • Process for the accelerated etching and refining of metals in ammoniacal etching systems
    Patent number: 5417818
    Abstract: Traditional recommendations consider the nitrate that occurs in the electrolysis cell as an interfering factor and attempt to remove the nitrate completely or largely from the etching solution. In accordance with the invention, it is recommended to operate the etching installations with a certain optimum nitrate content which brings about a considerable acceleration of etching speed and to realize an upper limit only by adding reducing agents whereby the reducing agents have the added advantage that for example in the electrolysis cell they favor the conversion from copper II to copper I.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: May 23, 1995
    Assignee: Elo-Chem Atztechnik GmbH
    Inventor: Andreas Linhard