Patents by Inventor Kirk OFEI

Kirk OFEI 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).

  • Publication number: 20240141466
    Abstract: A corrosion resistant duplex stainless steel (ferritic austenitic alloy) is suitable for use in a plant for the production of urea. Uses of the corrosion resistant duplex stainless steel include in objects made of said duplex stainless steel, in methods for the production of urea, in a plant for the production of urea comprising one or more parts made from said duplex stainless steel, and in methods of modifying an existing plant for the production of urea. In one aspect, the composition consists of in weight % (wt %): C 0.010 to 0.015; S 0.08 to 0.23; Mn 1.0 to 1.05; Cr 29.07 to 29.92; Ni 5.76 to 7.17; Mo 3.0 to 4.0; W max 2.55; N 0.3 to 0.35; Cu max 0.01; S max 0.008; P max 0.008; at least one of Ti, Nb, Hf, Ca, Ba, V, and B max 0.5 total; balance Fe and unavoidable occurring impurities.
    Type: Application
    Filed: January 9, 2024
    Publication date: May 2, 2024
    Applicant: Sandvik Intellectual Property AB
    Inventors: Daniel GULLBERG, Christina HARALDSSON, Anders WILSON, Alexander SCHEERDER, Kirk OFEI
  • Publication number: 20220112585
    Abstract: The present disclosure relates to a corrosion resistant duplex stainless steel (ferritic austenitic alloy) which is suitable for use in a plant for the production of urea and uses thereof. The disclosure also relates to objects made of said duplex stainless steel. Furthermore, the present disclosure relates to a method for the production of urea and to a plant for the production of urea having one or more parts made from the duplex stainless steel, and to a method of modifying an existing plant for the production of urea.
    Type: Application
    Filed: December 20, 2021
    Publication date: April 14, 2022
    Applicant: Sandvik Intellectual Property AB
    Inventors: Daniel GULLBERG, Christina HARALDSSON, Anders WILSON, Alexander SCHEERDER, Kirk OFEI
  • Patent number: 11242584
    Abstract: The present disclosure relates to a corrosion resistant duplex stainless steel (ferritic austenitic alloy), which is suitable for use in a plant for the production of urea and uses thereof. The disclosure also relates to objects made of the duplex stainless steel. Furthermore, the present disclosure relates to a method for the production of urea and to a plant for the production of urea having one or more parts made from the duplex stainless steel, and to a method of modifying an existing plant for the production of urea.
    Type: Grant
    Filed: July 20, 2016
    Date of Patent: February 8, 2022
    Assignee: Sandvik Intellectual Property AB
    Inventors: Daniel Gullberg, Christina Haraldsson, Anders Wilson, Alexander Scheerder, Kirk Ofei
  • Publication number: 20180209022
    Abstract: The present disclosure relates to a corrosion resistant duplex stainless steel (ferritic austenitic alloy), which is suitable for use in a plant for the production of urea and uses thereof. The disclosure also relates to objects made of the duplex stainless steel Furthermore, the present disclosure relates to a method for the production of urea and to a plant for the production of urea having one or more parts made from the duplex stainless steel, and to a method of modifying an existing plant for the production of urea.
    Type: Application
    Filed: July 20, 2016
    Publication date: July 26, 2018
    Inventors: Daniel GULLBERG, Christina HARALDSSON, Anders WILSSON, Alexander SCHEERDER, Kirk OFEI