Patents by Inventor Leslie Wilfred Benum

Leslie Wilfred Benum 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).

  • Thermal cracking process using tubes, pipes, and coils made of novel stainless steel matrix
    Patent number: 7156979
    Abstract: A thermal cracking process using tubes, pipes, and coils made of. An outermost surface covering not less than 55% of stainless steel, said surface having a thickness from 0.1 to 15 microns and being a spinel of the formula MnxCr3-xO4 wherein x is from 0.5 to 2 is not prone to coking and is suitable for hydrocarbyl reactions such as furnace tubes for cracking.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: January 2, 2007
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Leslie Wilfred Benum, Michael C. Oballa, Sabino Steven Anthony Petrone, Weixing Chen
  • External ribbed furnace tubes
    Patent number: 7128139
    Abstract: In a radiant heating box there is a convection current which flows over the surface of tubes in the box. Adding ribs to the external surface of vertical tubes provides an enhancement to the heat transfer by convection and increases the heat transfer to the tubes.
    Type: Grant
    Filed: October 14, 2004
    Date of Patent: October 31, 2006
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Michael C. Oballa, Leslie Wilfred Benum, Marvin Harvey Weiss
  • Passivation of steel surface to reduce coke formation
    Patent number: 7056399
    Abstract: The present invention provides a process to treat steels, preferably carbon steel to reduce the tendency of the steel to form coke when in contact with hydrocarbons at elevated temperatures. The steel may be first reduced then treated with a mixture of compounds which further modify the reduced surface and finally the treated steel surface is cured. The treated steel has a reduced propensity to form coke when in contact with hydrocarbons particularly at higher temperatures.
    Type: Grant
    Filed: April 29, 2003
    Date of Patent: June 6, 2006
    Assignee: NOVA Chemicals (International) S.A.
    Inventors: Haiyong Cai, Michael C. Oballa, Andrzej Krzywicki, Leslie Wilfred Benum
  • Composite surface on a stainless steel matrix
    Patent number: 6899966
    Abstract: A composite surface having a thickness from 10 to 5,000 microns comprising a spinel of the formula MnxCr3?xO4 wherein x is from 0.5 to 2 and oxides of Mn, Si selected from the group consisting of MnO, MnSiO3, Mn2SiO4 and mixtures thereof which are not prone to coking and are suitable for hydrocarbyl reactions such as furnace tubes for cracking.
    Type: Grant
    Filed: June 24, 2003
    Date of Patent: May 31, 2005
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Leslie Wilfred Benum, Michael C. Oballa, Sabino Steven Anthony Petrone
  • COMPOSITE SURFACE ON A STAINLESS STEEL MATRIX
    Publication number: 20040265604
    Abstract: A composite surface having a thickness from 10 to 5,000 microns comprising a spinel of the formula MnxCr3-xO4 wherein x is from 0.5 to 2 and oxides of Mn, Si selected from the group consisting of MnO, MnSiO3, Mn2SiO4 and mixtures thereof which are not prone to coking and are suitable for hydrocarbyl reactions such as furnace tubes for cracking.
    Type: Application
    Filed: June 24, 2003
    Publication date: December 30, 2004
    Applicant: NOVA Chemicals (International) S.A.
    Inventors: Leslie Wilfred Benum, Michael C. Oballa, Sabino Steven Anthony Petrone
  • Surface on a stainless steel matrix
    Patent number: 6824883
    Abstract: An outermost surface covering not less than 55% of stainless steel, said surface having a thickness from 0.1 to 15 microns and being a spinel of the formula MnxCr3-xO4 wherein x is from 0.5 to 2 is not prone to coking and is suitable for hydrocarbyl reactions such as furnace tubes for cracking.
    Type: Grant
    Filed: September 12, 2000
    Date of Patent: November 30, 2004
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Leslie Wilfred Benum, Michael C. Oballa, Sabino Steven Anthony Petrone, Weixing Chen
  • Passivation of steel surface to reduce coke formation
    Publication number: 20040216815
    Abstract: The present invention provides a process to treat steels, preferably carbon steel to reduce the tendency of the steel to form coke when in contact with hydrocarbons at elevated temperatures. The steel may be first reduced then treated with a mixture of compounds which further modify the reduced surface and finally the treated steel surface is cured. The treated steel has a reduced propensity to form coke when in contact with hydrocarbons particularly at higher temperatures.
    Type: Application
    Filed: April 29, 2003
    Publication date: November 4, 2004
    Inventors: Haiyong Cai, Michael C. Oballa, Andrzej Krzywicki, Leslie Wilfred Benum
  • Process of treating a stainless steel matrix
    Patent number: 6436202
    Abstract: Heat resistant stainless steel may be treated in a low oxidizing atmosphere in a heat/soak-heat/soak sequence to deplete its surface of Ni and Cr which tend to catalyze coking of hydrocarbons in contact with the surface of the stainless steel, and enrich it with elements which are inert to coke formation. Parts made of stainless steel, such as furnace tubes or coils, treated in accordance with the present invention when used have a significantly reduced rate of catalytic coking.
    Type: Grant
    Filed: September 12, 2000
    Date of Patent: August 20, 2002
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Leslie Wilfred Benum, Michael C. Oballa