Patents by Inventor Christopher S. Letko

Christopher S. Letko 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: 20220119427
    Abstract: Embodiments of the present disclosure are directed towards ?-hydroxyphosphonate functionalized polyols and isocyanate reactive compositions that include the ?-hydroxyphosphonate functionalized polyol and a base polyol.
    Type: Application
    Filed: January 29, 2020
    Publication date: April 21, 2022
    Applicant: Dow Global Technologies LLC
    Inventors: Christopher S. Letko, Ravi B. Shankar, Harshad M. Shah, Weijun Zhou
  • Publication number: 20220098358
    Abstract: Embodiments of the present disclosure are directed towards isocyanate reactive compositions that include a polyol and tris(4-hydroxyphenyl)methane alkoxylate.
    Type: Application
    Filed: January 30, 2020
    Publication date: March 31, 2022
    Applicant: Dow Global Technologies LLC
    Inventors: Christopher S. Letko, Weijun Zhou, Thomas P. Willumstad
  • Patent number: 11225550
    Abstract: A reaction system for forming a step-growth polymerized sulfur-containing polyester polyol includes at least one sulfur-containing component selected from the group of a sulfur-containing polyol or a sulfur-containing polycarboxylic acid, an amount of the at least one sulfur-containing component being from 1 wt % to 60 wt %, at least one aromatic component selected from the group of an aromatic multi-functional ester, an aromatic multi-functional carboxylic acid, and an aromatic anhydride, an amount of the at least one aromatic component being from 1 wt % to 60 wt %, at least one simple polyol that excludes sulfur and is different from the sulfur containing polyol, an amount of the at least one simple polyol being from 0 wt % to 60 wt %, and at least one polymerization catalyst. The reaction system for forming the sulfur-containing polyester polyol has a sulfur content that is from 2 wt % to 20 wt %.
    Type: Grant
    Filed: December 11, 2017
    Date of Patent: January 18, 2022
    Assignee: Dow Global Technologies LLC
    Inventors: Christopher S. Letko, Harshad M. Shah, Rajat Duggal, Nathan Wilmot
  • Patent number: 11214533
    Abstract: A mixture of octanols, nonanols and decanols is useful for the preparation of alkoxylates, which alkoxylates may be used as surfactants, which surfactants have surprisingly good biodegradability.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: January 4, 2022
    Assignee: Dow Global Technologies LLC
    Inventors: Sung-Yu Ku, Wanglin Yu, Christopher S. Letko, Stephen W. King, Michael A. Brammer
  • Publication number: 20210277178
    Abstract: A reaction system for forming a step-growth polymerized sulfur-containing polyester polyol includes at least one sulfur-containing component selected from the group of a sulfur-containing polyol or a sulfur-containing polycarboxylic acid, an amount of the at least one sulfur-containing component being from 1 wt % to 60 wt %, at least one aromatic component selected from the group of an aromatic multi-functional ester, an aromatic multi-functional carboxylic acid, and an aromatic anhydride, an amount of the at least one aromatic component being from 1 wt % to 60 wt %, at least one simple polyol that excludes sulfur and is different from the sulfur containing polyol, an amount of the at least one simple polyol being from 0 wt % to 60 wt %, and at least one polymerization catalyst. The reaction system for forming the sulfur-containing polyester polyol has a sulfur content that is from 2 wt % to 20 wt %.
    Type: Application
    Filed: December 11, 2017
    Publication date: September 9, 2021
    Inventors: Christopher S. Letko, Harshad M. Shah, Rajat Duggal, Nathan Wilmot
  • Publication number: 20210139400
    Abstract: A mixture of octanols, nonanols and decanols is useful for the preparation of alkoxylates, which alkoxylates may be used as surfactants, which surfactants have surprisingly good biodegradability.
    Type: Application
    Filed: June 26, 2018
    Publication date: May 13, 2021
    Applicant: Dow Global Technologies LLC
    Inventors: Sung-Yu Ku, Wanglin Yu, Christopher S. Letko, Stephen W. King, Michael A. Brammer
  • Patent number: 10626293
    Abstract: An acrylic polyurethane coating composition, comprising an isocyanate component comprising at least one polyisocyanate trimer; and an isocyanate reacting mixture, the isocyanate reacting mixture comprising from 25 wt % to 80 wt % of an acrylic polyol and from 1 wt % to 30 wt % of a polyether polyol, based on a total weight of the acrylic polyurethane coating composition, the acrylic polyol having a solids content of at least 50 wt %, based on a total weight of the acrylic polyol, and the polyether polyol having a viscosity of less than 500 mPa*s at 25° C. and a number average molecular weight greater than 300 and less than 700.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: April 21, 2020
    Assignee: DOW Global Technologies LLC
    Inventors: Christopher S. Letko, Amber Marie Stephenson, John N. Argyropoulos, John Klier
  • Publication number: 20180355211
    Abstract: An acrylic polyurethane coating composition, comprising an isocyanate component comprising at least one polyisocyanate trimer; and an isocyanate reacting mixture, the isocyanate reacting mixture comprising from 25 wt % to 80 wt % of an acrylic polyol and from 1 wt % to 30 wt % of a polyether polyol, based on a total weight of the acrylic polyurethane coating composition, the acrylic polyol having a solids content of at least 50 wt %, based on a total weight of the acrylic polyol, and the polyether polyol having a viscosity of less than 500 mPa*s at 25° C. and a number average molecular weight greater than 300 and less than 700.
    Type: Application
    Filed: November 30, 2016
    Publication date: December 13, 2018
    Applicant: Dow Global Technologies LLC
    Inventors: Christopher S. Letko, Amber Marie Stephenson, John N. Argyropoulos, John Klier
  • Publication number: 20180046076
    Abstract: A three-dimensional printing photocurable composition includes from 20 wt % to 70 wt % of an urethane acrylate component, from 20 wt % to 60 wt % of a multifunctional epoxide component, from 1 wt % to 15 wt % of a monomer component, and from 1 wt % to 8 wt % of a photoinitiator component, based on the total weight of the composition. The urethane acrylate component includes the capping reaction product of an acrylate and an isocyanate terminated prepolymer and the isocyanate-terminated prepolymer is the reaction product of a polyisocyanate and at least one polyol having a molecular weight of at least 3000 g/mol. The multifunctional epoxide component includes one or more multifunctional epoxides. The monomer component includes at least one of a multifunctional acrylate monomer and a multifunctional vinyl ether monomer.
    Type: Application
    Filed: February 25, 2016
    Publication date: February 15, 2018
    Inventors: Christopher S. Letko, William H. Heath, Nathan Wilmot, Sven Claessens, William L. Heaner, IV, Adam C. Colson, Stephen W. King, John G. Pendergast, Jr.