Patents by Inventor Sanat K. Kumar

Sanat K. Kumar 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: 20240325984
    Abstract: Cation exchange membranes are prepared via facile methods to control sulfonation of polystyrene repeat units. An amount of sulfuric acid is reacted with an acetic anhydride to form an amount of acetyl sulfate. The acetyl sulfate is then added to a known concentration of polystyrene units in boiling dichloromethane (DCM) to form sulfonated polystyrene random copolymers, including a random distribution of sulfonated polystyrene repeats and unsulfonated polystyrene repeats, with sulfonation levels between about 0.07 and about 0.225. The sulfonation level can be controlled by adjusting reaction times, reaction temperatures, and sulfuric acid loading in the reaction mediums. These membranes, neutralized via alkali metals, exhibit high charge densities and low hydration degrees, and maintain high permselectivity under various high solution concentrations.
    Type: Application
    Filed: March 27, 2024
    Publication date: October 3, 2024
    Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK
    Inventors: Ngai Yin YIP, Sanat K. KUMAR, Yuxuan HUANG, Marshall TEKELL
  • Patent number: 12042779
    Abstract: Gas separation membranes as may be used in separating gaseous materials from one another and methods of forming the membranes are described. The separation membranes include polymer-grafted nanoparticles (GNPs) as a platform and a relatively small amount of free polymer. The free polymer and the polymer grafted to the nanoparticles have the same chemical structure and similar number average molecular weights. The gas separation membranes can exhibit high ideal selectivity and can be used in a variety of applications, such as carbon capture.
    Type: Grant
    Filed: April 7, 2020
    Date of Patent: July 23, 2024
    Assignees: University of South Carolina, Columbia University
    Inventors: Brian C. Benicewicz, Yucheng Huang, Connor R. Bilchak, Sanat K. Kumar
  • Publication number: 20220258131
    Abstract: Gas separation membranes as may be used in separating gaseous materials from one another and methods of forming the membranes are described. The separation membranes include polymer-grafted nanoparticles (GNPs) as a platform and a relatively small amount of free polymer. The free polymer and the polymer grafted to the nanoparticles have the same chemical structure and similar number average molecular weights. The gas separation membranes can exhibit high ideal selectivity and can be used in a variety of applications, such as carbon capture.
    Type: Application
    Filed: April 7, 2020
    Publication date: August 18, 2022
    Inventors: BRIAN C. BENICEWICZ, YUCHENG HUANG, CONNOR R. BILCHAK, SANAT K. KUMAR
  • Publication number: 20210264663
    Abstract: The present subject matter relates to a voxel and methods of organizing an object into a three-dimensional (3D) array using the voxel. The voxel can include a plurality of frames including at least one single stranded (ss) DNA motif with at least one free base, wherein the at least one ssDNA motif hybridizes with a complementary strand fragment of other frames.
    Type: Application
    Filed: October 14, 2020
    Publication date: August 26, 2021
    Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK
    Inventors: Oleg Gang, Ye Tian, Jason S. Kahn, Yan Xiong, Brian Minevich, Sanat K. Kumar
  • Patent number: 10112143
    Abstract: Provided are methods of separating one or more components from a fluid by using membranes and other materials comprising polymer graft nanoparticles arranged in a lattice structure. The disclosed compositions exhibit an increase in selectivity between two penetrants that is greater than the neat polymer selectivity for those penetrants. The compositions also exhibit an increase in selectivity between two penetrants with increasing permeability. Also provided are systems for effecting such separations, systems for agent detection, and additional methods for constructing separation components.
    Type: Grant
    Filed: October 8, 2015
    Date of Patent: October 30, 2018
    Assignees: The Trustees of Columbia University in the City of New York, University of South Carolina
    Inventors: Sanat K. Kumar, Christopher James Durning, Eileen Buenning, Connor Bilchak, Brian C. Benicewicz
  • Publication number: 20160101386
    Abstract: Provided are methods of separating one or more components from a fluid by using membranes and other materials comprising polymer graft nanoparticles arranged in a lattice structure. The disclosed compositions exhibit an increase in selectivity between two penetrants that is greater than the neat polymer selectivity for those penetrants. The compositions also exhibit an increase in selectivity between two penetrants with increasing permeability. Also provided are systems for effecting such separations, systems for agent detection, and additional methods for constructing separation components.
    Type: Application
    Filed: October 8, 2015
    Publication date: April 14, 2016
    Inventors: Sanat K. Kumar, Christopher James Durning, Eileen Buenning, Connor Bilchak
  • Patent number: 9133314
    Abstract: An anisotropic self assembled structure comprises isotropic grafted nanoparticles in a polymeric matrix, the self-assembled structure comprising (a) a one-dimensional string of the grafted nanoparticles within the matrix, the string having a width of one nanoparticle and a length of 1-10 nanoparticles, (b) a substantially two-dimensional sheet of the grafted nanoparticles within the matrix, the sheet having a length and a breadth of at least one micron respectively, wherein the sheet is about 2-5 nanoparticles in thickness, or (c) a plurality of three dimensionally interconnected structures where the width of each of the structures is 1-10 nanoparticles; wherein each grafted nanoparticle comprises a substantially spherical inorganic core nanoparticle and a polymeric brush structure grafted thereto.
    Type: Grant
    Filed: December 16, 2008
    Date of Patent: September 15, 2015
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Pinar Akcora, Sanat K. Kumar
  • Patent number: 8889766
    Abstract: A method of forming a solid-state polymer can include grafting a graft polymer to nanoparticles to provide grafted nanoparticles, and dispersing the grafted nanoparticles in a polymer matrix to provide a specified loading of the grafted nanoparticles within the polymer matrix to form a solid-state polymer. A solid-state polymer can include grafted nanoparticles comprising a polymer graft grafted to nanoparticles, and a polymer matrix, in which the grafted nanoparticles are dispersed to form a solid-state polymer, the dispersion configured to provide a specified loading of the grafted nanoparticles within the solid-state polymer.
    Type: Grant
    Filed: March 1, 2012
    Date of Patent: November 18, 2014
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Jeffrey William Kysar, Sanat K. Kumar, Benjamin Fragneaud, Damien Maillard
  • Publication number: 20120277377
    Abstract: A method of forming a solid-state polymer can include grafting a graft polymer to nanoparticles to provide grafted nanoparticles, and dispersing the grafted nanoparticles in a polymer matrix to provide a specified loading of the grafted nanoparticles within the polymer matrix to form a solid-state polymer. A solid-state polymer can include grafted nanoparticles comprising a polymer graft grafted to nanoparticles, and a polymer matrix, in which the grafted nanoparticles are dispersed to form a solid-state polymer, the dispersion configured to provide a specified loading of the grafted nanoparticles within the solid-state polymer.
    Type: Application
    Filed: March 1, 2012
    Publication date: November 1, 2012
    Applicant: The Trustees of Columbia University in the City of New York
    Inventors: Jeffrey William Kysar, Sanat K. Kumar, Benjamin Fragneaud, Damien Maillard
  • Publication number: 20100303874
    Abstract: An anisotropic self assembled structure comprises isotropic grafted nanoparticles in a polymeric matrix, the self-assembled structure comprising (a) a one-dimensional string of the grafted nanoparticles within the matrix, the string having a width of one nanoparticle and a length of 1-10 nanoparticles, (b) a substantially two-dimensional sheet of the grafted nanoparticles within the matrix, the sheet having a length and a breadth of at least one micron respectively, wherein the sheet is about 2-5 nanoparticles in thickness, or (c) a plurality of three dimensionally interconnected structures where the width of each of the structures is 1-10 nanoparticles; wherein each grafted nanoparticle comprises a substantially spherical inorganic core nanoparticle and a polymeric brush structure grafted thereto.
    Type: Application
    Filed: December 16, 2008
    Publication date: December 2, 2010
    Inventors: Pinar Akcora, Sanat K. Kumar