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: 20260241664Abstract: Multilayer compositions may include at least one first layer containing a thermoset resin; and a second layer emplaced on the at least one first layer and containing a reaction product of: an isocyanate component containing one or more isocyanate compounds; and an isocyanate-reactive component containing: one or more polyether polyols, one or more aliphatic polyols; and one or more hollow particles present in at least one of the isocyanate component, the isocyanate-reactive component, or a third component. Methods may include preparing a multilayer composition, including depositing at least one layer of a thermoset resin on a substrate; and disposing a second layer on the at least one layer of thermoset resin.Type: ApplicationFiled: September 13, 2023Publication date: August 20, 2026Inventors: Abhishek U. Shete, James Young, JR., George A. Klumb, Nan Wang, Chi-Wei Tsang, Abhishek Dhyani, Kaoru Aou, Christopher S. Letko, Michael A. Donate, Maribel R. Cannon, Avery L. Watkins
-
Publication number: 20250092218Abstract: Repolyols can be quickly produced by combining fragments of a polyurethane product which with a reagent which is an organic acid or an anhydride of the organic acid or a mixture thereof to form a reaction mixture, and heating the reaction mixture to a reaction temperature greater than a melting point of the reagent for a reaction time of no greater than two hours. The organic acid comprises two carboxylic acid groups linked to each other through a linking group having two or three carbon atoms in the linking chain. The anhydride can include a 5 or 6 member cyclic structure with the group —C(O)—O—C(O)—.Type: ApplicationFiled: September 9, 2024Publication date: March 20, 2025Inventors: Zachary Westman, Baoyuan Liu, Kelsey Richardson, Christopher S. Letko, Phillip Christopher, Mahdi M. Abu-Omar, Paul A. Gillis, Thomas C. Farmer, Vojtech Vlcek
-
Patent number: 12202928Abstract: Embodiments of the present disclosure are directed towards isocyanate reactive compositions that include a polyol and tris(4-hydroxyphenyl)methane alkoxylate.Type: GrantFiled: January 30, 2020Date of Patent: January 21, 2025Assignee: Dow Global Technologies LLCInventors: Christopher S. Letko, Weijun Zhou, Thomas P. Willumstad
-
Patent number: 12110306Abstract: 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: GrantFiled: January 29, 2020Date of Patent: October 8, 2024Assignee: Dow Global Technologies LLCInventors: Christopher S. Letko, Ravi B. Shankar, Harshad M. Shah, Weijun Zhou
-
Publication number: 20220119427Abstract: 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: ApplicationFiled: January 29, 2020Publication date: April 21, 2022Applicant: Dow Global Technologies LLCInventors: Christopher S. Letko, Ravi B. Shankar, Harshad M. Shah, Weijun Zhou
-
Publication number: 20220098358Abstract: Embodiments of the present disclosure are directed towards isocyanate reactive compositions that include a polyol and tris(4-hydroxyphenyl)methane alkoxylate.Type: ApplicationFiled: January 30, 2020Publication date: March 31, 2022Applicant: Dow Global Technologies LLCInventors: Christopher S. Letko, Weijun Zhou, Thomas P. Willumstad
-
Patent number: 11225550Abstract: 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: GrantFiled: December 11, 2017Date of Patent: January 18, 2022Assignee: Dow Global Technologies LLCInventors: Christopher S. Letko, Harshad M. Shah, Rajat Duggal, Nathan Wilmot
-
Patent number: 11214533Abstract: 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: GrantFiled: June 26, 2018Date of Patent: January 4, 2022Assignee: Dow Global Technologies LLCInventors: Sung-Yu Ku, Wanglin Yu, Christopher S. Letko, Stephen W. King, Michael A. Brammer
-
Publication number: 20210277178Abstract: 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: ApplicationFiled: December 11, 2017Publication date: September 9, 2021Inventors: Christopher S. Letko, Harshad M. Shah, Rajat Duggal, Nathan Wilmot
-
Publication number: 20210139400Abstract: 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: ApplicationFiled: June 26, 2018Publication date: May 13, 2021Applicant: Dow Global Technologies LLCInventors: Sung-Yu Ku, Wanglin Yu, Christopher S. Letko, Stephen W. King, Michael A. Brammer
-
Patent number: 10626293Abstract: 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: GrantFiled: November 30, 2016Date of Patent: April 21, 2020Assignee: DOW Global Technologies LLCInventors: Christopher S. Letko, Amber Marie Stephenson, John N. Argyropoulos, John Klier
-
Publication number: 20180355211Abstract: 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: ApplicationFiled: November 30, 2016Publication date: December 13, 2018Applicant: Dow Global Technologies LLCInventors: Christopher S. Letko, Amber Marie Stephenson, John N. Argyropoulos, John Klier
-
Publication number: 20180046076Abstract: 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: ApplicationFiled: February 25, 2016Publication date: February 15, 2018Inventors: Christopher S. Letko, William H. Heath, Nathan Wilmot, Sven Claessens, William L. Heaner, IV, Adam C. Colson, Stephen W. King, John G. Pendergast, Jr.