Patents by Inventor Eckhard Siefert

Eckhard Siefert 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).

  • Apparatus for the inductive heating of workpieces especially for the heating of cam shafts
    Patent number: 4100387
    Abstract: An apparatus for surface hardening an irregularly shaped workpiece made of hardenable material by inductive heating whereby a clamped workpiece is rotated past a linear conductor disposed along the envelope circle formed by the cam of the workpiece which extends farthest from the workpiece axis. The conductor has a plurality of yoke sheets to heat the workpiece surface uniformly.
    Type: Grant
    Filed: August 10, 1976
    Date of Patent: July 11, 1978
    Assignee: AEG-Elotherm, G.m.b.H.
    Inventors: Friedhelm Reinke, Ludwig Mackenberger, Eckhard Siefert