Patents by Inventor Willem J. Hagendoorn

Willem J. Hagendoorn 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 of treating dross materials in metallurgical melting processes
    Patent number: 5259867
    Abstract: In a metallurgical process, a unique materials conservation and environmental process for treating cross materials at the site of a melting chamber by applying a preselected fines suppressing agent to stages of the dross materials promptly after removal from the melting chamber.
    Type: Grant
    Filed: June 1, 1992
    Date of Patent: November 9, 1993
    Inventor: Willem J. Hagendoorn
  • Method and structure for maintaining effluent pressure range within an electric arc melting furnace
    Patent number: 4450569
    Abstract: A method is provided for maintaining a predetermined effluent gas pressure within an electric arc melting furnace of the type having an off-gas duct system. The method involves establishing, by simulation, correlations between specific measurable physical characteristics within the furnace and in the off-gas duct system and then utilizing these correlations to establish a program for automatically varying the volume of off-gas flow through the duct to maintain effluent gas pressure within a desired range within the furnace. Sensors are provided in the duct system to monitor the physical characteristics in the off-gas flow and for transmitting data to a microprocessor adapted to operate flow-regulating apparatus in the duct system to thereby maintain the pressure within the furnace within a predetermined range.
    Type: Grant
    Filed: September 1, 1982
    Date of Patent: May 22, 1984
    Inventor: Willem J. Hagendoorn