Patents by Inventor Leif Markegaard

Leif Markegaard 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).

  • Inductor for induction hardening of metal, rod-shaped toothed racks
    Patent number: 8338760
    Abstract: An inductor for induction hardening of a metallic rod-shaped toothed rack, wherein a first outer surface of the toothed rack provided with the teeth is substantially planar and a remaining second outer surface of the toothed rack in cross-section is profiled, wherein the inductor has a substantially rod-shaped first inductor element that extends parallel to a longitudinal axis of the toothed rack. The first inductor element extends across an entire length of the toothed rack to be hardened along the first outer surface provided with the teeth and hardens the first outer surface of the toothed rack. The toothed rack and the inductor during the hardening process are arranged stationarily.
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: December 25, 2012
    Assignee: EFD Induction GmbH
    Inventor: Leif Markegaard
  • Inductor for Inductor Hardening of Metal, Rod-Shaped Toothed Racks
    Publication number: 20100059506
    Abstract: An inductor for induction hardening of a metallic rod-shaped toothed rack, wherein a first outer surface of the toothed rack provided with the teeth is substantially planar and a remaining second outer surface of the toothed rack in cross-section is profiled, wherein the inductor has a substantially rod-shaped first inductor element that extends parallel to a longitudinal axis of the toothed rack. The first inductor element extends across an entire length of the toothed rack to be hardened along the first outer surface provided with the teeth and hardens the first outer surface of the toothed rack. The the toothed rack and the inductor during the hardening process are arranged stationarily.
    Type: Application
    Filed: March 27, 2008
    Publication date: March 11, 2010
    Applicant: EFD INDUCTION GMBH
    Inventor: Leif Markegaard
  • Cooled induction heating coil
    Patent number: 6900420
    Abstract: The present invention relates to an induction heating coil comprising a litz cable which is wound into a spiral to form a bobbin, and means for cooling said cable indirectly. The litz cable is arranged to be cooled by means of an indirect cooling system that comprises a tube which is wound in an intermeshed fashion with the windings of the litz cable. The present invention relates also to a method on a paper or board machine or on a paper finishing machine, in which method at least one induction heating coil comprising a wound litz cable is used for heating a component, and said coil is cooled indirectly by a cooling medium.
    Type: Grant
    Filed: December 17, 2001
    Date of Patent: May 31, 2005
    Assignees: Metso Automation Oy, EFD Induction a.s.
    Inventors: Leif Markegård, Lars Andersson, Risto Säynäväjärvi, Pekka Höyssä