Patents by Inventor Erwin Coester

Erwin Coester 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 forming an anticorrosive oxide layer on steels
    Patent number: 4153480
    Abstract: A method is provided for forming an anti-corrosive oxide layer on steel. The steel surface is subjected to superheated steam for a period of one to several hours. Before subjecting the steel to the superheated steam, the steel surface is initially subjected to a gaseous formic acid atmosphere at a raised temperature of up to 480.degree. C. The treatment with superheated steam takes place during a further heating period in which a temperature between 450.degree. C. and 520.degree. C. is maintained under steam flow-through conditions in which the steam flow has a Reynolds number greater than 900.
    Type: Grant
    Filed: November 17, 1977
    Date of Patent: May 8, 1979
    Assignee: Uranit Uran-Isotopentrennungs-Gesellschaft mbH
    Inventors: Erwin Coester, Heinz Krapf, Martin Pfistermeister, Bruno Sartor, Hans Mohrhauer
  • Process for the formation of an anticorrosive, oxide layer on maraging steels
    Patent number: 4141759
    Abstract: A method is provided for forming an anti-corrosive, oxide layer on steel. The steel surface is subjected to superheated steam for a period of one to several hours. Before subjecting the steel to the superheated steam, a clean steel surface is initially heated to at least 200.degree. C. in a nitrogen, air, or oxygen atmosphere. The treatment with superheated steam takes place during a further heating period in which a temperature between 450.degree. C. and 520.degree. C. is reached and maintained under steam flow through conditions in which the steam flow is turbulent or should have a Reynolds number greater than 900.
    Type: Grant
    Filed: January 20, 1976
    Date of Patent: February 27, 1979
    Assignee: URANIT Uran-Isotopentrennungs-Gesellschaft mbH
    Inventors: Martin Pfistermeister, Heinz Krapf, Erwin Coester