Patents by Inventor Gerrit Hein Nijhof

Gerrit Hein Nijhof 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).

  • Patent number: 5741348
    Abstract: A method of refining a melt of aluminum scrap material which comprises metallic aluminum and impurities including iron, in order to obtain a target iron level. The method includes the steps of determining the initial amounts in the melt of Mn, Fe and Si, adding a quantity of Mn to the melt so as to obtain in the melt, after refining of the melt a ratio of Mn in the melt to a desired target level of Fe. Thereafter, the method includes the steps of homogenizing the melt by heating, cooling the melt and maintaining it at a super-eutectic holding temperature so that solid intermetallic compounds form and finally separating the solid intermetallic compounds from the melt.
    Type: Grant
    Filed: May 28, 1996
    Date of Patent: April 21, 1998
    Assignee: Hoogovens Aluminium BV
    Inventors: Henricus Matheus Van Der Donk, Gerrit Hein Nijhof