Patents by Inventor Gregory Ryan Lehnhoff

Gregory Ryan Lehnhoff 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 for joining steel rails with controlled weld heat input
    Patent number: 10851436
    Abstract: A method for creating a welded joint between ends of two steel rails, wherein the two steel rails have a substantially pearlitic microstructure. The method includes a first heating step, an upsetting step, a first cooling step, and a second heating step and provides a means to influence a microstructure and hardness of an austenitic region of a heat affected zone (HAZ) and/or an extent of softening in a softened region of a HAZ.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: December 1, 2020
    Assignee: CF&I STEEL L.P.
    Inventors: Gregory Ryan Lehnhoff, Joseph Victor Kristan, Mark David Richards
  • METHOD FOR JOINING STEEL RAILS WITH CONTROLLED WELD HEAT INPUT
    Publication number: 20190100822
    Abstract: A method for creating a welded joint between ends of two steel rails, wherein the two steel rails have a substantially pearlitic microstructure. The method includes a first heating step, an upsetting step, a first cooling step, and a second heating step and provides a means to influence a microstructure and hardness of an austenitic region of a heat affected zone (HAZ) and/or an extent of softening in a softened region of a HAZ.
    Type: Application
    Filed: September 28, 2018
    Publication date: April 4, 2019
    Inventors: Gregory Ryan Lehnhoff, Joseph Victor Kristan, Mark David Richards
  • High carbon steel rail with enhanced ductility
    Patent number: 9670570
    Abstract: This invention relates to a high carbon steel rail with enhanced ductility comprising 0.65-1.4 mass % of carbon, 0.1-1.5 mass % of silicon, 0.01-0.4 mass % of manganese, 0.1-1.5 mass % of chromium, and 0.005-0.05 mass % of titanium, with additional allowances for Mo, Nb, V, Cu, M, Co, B, N, Ca, Mg, Zr, Al, and W, with the remainder comprising iron and the inevitable impurities, that displays a head surface hardness of at least 325 HB and a microstructure comprising at least 90% pearlite at a depth of between 2-20 mm below the rail head surface. The invention also relates to the process for manufacturing the high carbon steel rail with enhanced ductility.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: June 6, 2017
    Assignee: EVRAZ INC. NA CANADA
    Inventors: Joseph Victor Kristan, Gregory Ryan Lehnhoff, Mark David Richards
  • HIGH CARBON STEEL RAIL WITH ENHANCED DUCTILITY
    Publication number: 20150299832
    Abstract: This invention relates to a high carbon steel rail with enhanced ductility comprising 0.65-1.4 mass % of carbon, 0.1-1.5 mass % of silicon, 0.01-0.4 mass % of manganese, 0.1-1.5 mass % of chromium, and 0.005-0.05 mass % of titanium, with additional allowances for Mo, Nb, V, Cu, M, Co, B, N, Ca, Mg, Zr, Al, and W, with the remainder comprising iron and the inevitable impurities that displays a head surface hardness of at least 325 HB and a microstructure comprising at least 90% pearlite at a depth of between 2-20 mm below the rail head surface. The invention also relates to the process for manufacturing the high carbon steel rail with enhanced ductility.
    Type: Application
    Filed: April 17, 2014
    Publication date: October 22, 2015
    Applicant: EVRAZ Inc. NA Canada
    Inventors: Joseph Victor Kristan, Gregory Ryan Lehnhoff, Mark David Richards