Patents by Inventor Harald Ottertun

Harald Ottertun 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 etching copper and recovery of the spent etching solution
    Patent number: 8236189
    Abstract: An etching and recovery method is described, wherein articles made of copper are etched with an acid aqueous solution of etching chemicals containing Cu2+ for oxidizing Cu0 to Cu+, chloride ions, oxidizing agent which oxidizes Cu+ to Cu2+, and pH-adjusting hydrochloric acid. The technical problem to be solved is to make it possible to circulate the etching solution between the etching process and the recovery process during the recovery of used etching solution in such a manner that a closed circuit can be maintained between the processes.
    Type: Grant
    Filed: July 7, 2008
    Date of Patent: August 7, 2012
    Assignee: Sigma Engineering AB
    Inventor: Harald Ottertun
  • Method for Etching Copper and Recovery of the Spent Etching Solution
    Publication number: 20110000884
    Abstract: An etching and recovery method is described, wherein articles made of copper are etched with an acid aqueous solution of etching chemicals containing Cu2+ for oxidising Cu0 to Cu+, chloride ions, oxidising agent which oxidises Cu+ to Cu2+, and pH-adjusting hydrochloric acid. The technical problem to be solved is to make it possible to circulate the etching solution between the etching process and the recovery process during the recovery of used etching solution in such a manner that a closed circuit can be maintained between the processes.
    Type: Application
    Filed: July 7, 2008
    Publication date: January 6, 2011
    Inventor: Harald Ottertun