Patents by Inventor Francois Knaff

Francois Knaff 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: 4993691
    Abstract: A gas injection lance for use in metal refining is disclosed. The lance includes a tube having an inner diameter profile and a throttle member slidably received with the tube. The tube and throttle member define an annular gas flowpath. The throttle body may be moved axially within the tube to modify the characteristics of the flowpath.
    Type: Grant
    Filed: August 17, 1989
    Date of Patent: February 19, 1991
    Assignee: Arbed S.A.
    Inventors: Robert Mousel, Carlo Lux, Francois Knaff, Henri Klein, Romain Henrion, Carlo Heintz, Michel Decker, Andre Bock
  • Patent number: 4971297
    Abstract: Nozzles for a refining lance are presented which are spaced upwardly from the head of the lance and supply post-combustion oxygen to the space above a molten metal bath undergoing refining. Each of the nozzles has a mouthpiece with two parallel sharp edges which are arranged in planes passing substantially through the axis of the lance and which are connected by slightly rounded edges. Above the mouthpiece of each nozzle is a converging part.
    Type: Grant
    Filed: March 9, 1989
    Date of Patent: November 20, 1990
    Assignee: Arbed S.A.
    Inventors: Romain Henrion, Henri Klein, Francois Knaff, Robert Mousel, Michel Decker, Carlo Heintz, Carlo Lux, Patrick Derungs, Henri Hoerold, Andre Bock