Patents by Inventor Ioannis Demertzis

Ioannis Demertzis 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).

  • Use of nitrogen compounds in the pickling of stainless steel
    Patent number: 9487741
    Abstract: The present invention relates to an acidic aqueous solution suitable for the pickling of stainless steel grades that comprises accelerators based on water soluble inorganic compounds comprising at least one nitrogen atom in an oxidation state in the range of ?2 to ??. The present invention further encompasses a process for the pickling of stainless steel that makes use of a pickling solution comprising the above-mentioned accelerators.
    Type: Grant
    Filed: July 29, 2014
    Date of Patent: November 8, 2016
    Inventors: Ioannis Demertzis, Mauro Rigamonti, Paolo Giordani, Paolo Gamboggi
  • USE OF NITROGEN COMPOUNDS IN THE PICKLING OF STAINLESS STEEL
    Publication number: 20140334965
    Abstract: The present invention relates to an acidic aqueous solution suitable for the pickling of stainless steel grades that comprises accelerators based on water soluble inorganic compounds comprising at least one nitrogen atom in an oxidation state in the range of ?2 to ??. The present invention further encompasses a process for the pickling of stainless steel that makes use of a pickling solution comprising the above-mentioned accelerators.
    Type: Application
    Filed: July 29, 2014
    Publication date: November 13, 2014
    Inventors: Ioannis DEMERTZIS, Mauro RIGAMONTI, Paolo GIORDANI
  • Steel pickling process in which the oxidation of the ferrous ion formed is carried out electrolytically
    Patent number: 6210558
    Abstract: Stainless steel pickling process in which a pickling solution containing HF and Fe3+ ions as essential components is used, and wherein the oxidation to Fe3+ of the Fe2+ formed during the process in order to maintain the Fe3+ concentration to the predetermined value, is electrolytically carried out by submitting the pickling solution as it is to an oxidation process in an electrolytic cell equipped with anode made of inalterable materials chosen among graphite, granular coal, lead and with cathodes made of stainless steel, graphite or other unalterable materials, said cell working with an applied tension between 1 and 8 V and with an anodic current density between 0.4 and 15 A/dm2.
    Type: Grant
    Filed: January 11, 1999
    Date of Patent: April 3, 2001
    Assignees: Henkel Kommanditgesellschaft auf Aktien, Acciai Speciali Terni S.p.A.
    Inventors: Ioannis Demertzis, Paolo Giordani, Cesare Pedrazzini, Maurizio Busnelli