Patents by Inventor Dietfried Gamsriegler

Dietfried Gamsriegler 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 pickling steel
    Patent number: 6398876
    Abstract: Stainless steel is pickled by a chemical and/or electrochemical pickling process using an acid liquid, containing substantially no nitric acid. The process uses a spent electrolyte solution from an electrochemical, neutral salt pickling tank, such as a sodium sulfate pickling tank. The spent electrolyte solution is added to an acid solution to form a pickling acid capable of pickling stainless steel, oxidizing Fe2+ to Fe3+ and reducing Cr6+ to Cr3+.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: June 4, 2002
    Assignee: Andritz—Patentverwaltungs-Gesellschaft m.b.H.
    Inventors: Jovan Starcevic, Dietfried Gamsriegler
  • Process for regenerating hydrochloric acid from pickling plants
    Patent number: 6210650
    Abstract: In order to reduce pollutants in the waste gas of regeneration plants for spent hydrochloric acid from pickling plants a process is provided, comprising the thermal decomposition of iron chloride in the spent pickling acid to iron oxide and gaseous hydrochloric acid, wherein to the spent pickling acid at least one compound is admixed which contains nitrogen having a low oxidation number, for example ammonium compounds, ammonia, urea or amides.
    Type: Grant
    Filed: July 27, 1994
    Date of Patent: April 3, 2001
    Assignee: Andritz-Patentverwaltungs-Gesellschaft m.b.H
    Inventors: Wilhelm Karner, Dietfried Gamsriegler