Patents by Inventor Karl-Otto Prietzel

Karl-Otto Prietzel 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 electrolytic production of cyanide in nitrocarburizing melts
    Patent number: 6159355
    Abstract: In order to shorten the waiting times until the equilibrium between cyanate and cyanide is established and to limit the use of substances and products containing cyanide for nitrocarburizing in salt melts, melts containing only cyanate and optionally carbonate are electrolyzed at a current density of 4 to 100 A/dm.sup.2 of electrode area to form an advantageous cyanide content of 1 to 5 wt. %.
    Type: Grant
    Filed: July 16, 1999
    Date of Patent: December 12, 2000
    Assignee: Houghton Durferrit GmbH
    Inventors: Ulrich Baudis, Mandy Doose, Karl-Otto Prietzel