Patents by Inventor Mans K. O. Johnsson

Mans K. O. Johnsson 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).

  • Metallurgical process
    Patent number: 4188206
    Abstract: The carbon content in iron, cobalt, or nickel based alloys containing at least about 16% chromium is substantially eliminated without significant loss of chromium by blowing the alloy with oxygen to oxidize the carbon and simultaneously introducing steam or ammonia in amounts such that the partial pressure of carbon monoxide (formed by oxidation of carbon) is lower than that which corresponds to the equilibrium pressure for the carbon/chromium oxidation e.g. below 0.95 and preferably below 0.5 atmospheres.
    Type: Grant
    Filed: May 2, 1977
    Date of Patent: February 12, 1980
    Assignee: Uddeholms Aktiebolag
    Inventors: Mans K. O. Johnsson, Lars A. Eriksson