Patents by Inventor Purushoth Kesavan

Purushoth Kesavan 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).

  • Patent number: 11739234
    Abstract: Disclosed is a two-part composition for sealing natural stone or masonry, and methods of use. The two-part composition is comprised of (1) a first part comprising a polyvinylidene fluoride (PVDF) particulate; a low evaporation rate organic solvent; and water; and (2) a second part comprising a blend of a plurality of liquid resin formulations.
    Type: Grant
    Filed: February 2, 2021
    Date of Patent: August 29, 2023
    Assignee: Questech Corporation
    Inventors: Barry Culkin, Roger Questel, Robert Harrington, Douglas Croteau, Paul Thottathil, Purushoth Kesavan, John Ryan, Satyabrata Mukherjee
  • Publication number: 20210253890
    Abstract: Disclosed is a two-part composition for sealing natural stone or masonry, and methods of use. The two-part composition is comprised of (1) a first part comprising a polyvinylidene fluoride (PVDF) particulate; a low evaporation rate organic solvent; and water; and (2) a second part comprising a blend of a plurality of liquid resin formulations.
    Type: Application
    Filed: February 2, 2021
    Publication date: August 19, 2021
    Applicant: Questech Corporation
    Inventors: Barry Culkin, Roger Questel, Robert Harrington, Douglas Croteau, Paul Thottathil, Purushoth Kesavan, John Ryan, Satyabrata Mukherjee
  • Patent number: 10532956
    Abstract: This invention relates to polymeric compositions for application onto natural stone in order to provide for long-term chemical, stain, and water resistance, along with antimicrobial properties. Many natural, unsealed stones do not have stain, etch, or water resistance. The described compositions were developed using a technology of chemical grafting that involves the use of prepolymers, monomers, catalysts, graft initiators, wetting agents, antimicrobial agents, and other ingredients. The composition, when thus applied to the stone surface allows it to obtain a graft polymerization, thereby forming a polymer film that is chemically attached to the natural stone, rather than typical physical bonding of other sealer compositions. The natural stones react with a graft initiator in the composition, which creates the reaction sites on the natural stone surface via free radical mechanisms.
    Type: Grant
    Filed: August 11, 2017
    Date of Patent: January 14, 2020
    Assignee: Questech Corporation
    Inventors: Barry Culkin, Roger Questel, Robert Harrington, Douglas Croteau, Paul Thottathil, Purushoth Kesavan, John Ryan, Satyabrata Mukherjee
  • Publication number: 20190047916
    Abstract: This invention relates to polymeric compositions for application onto natural stone in order to provide for long-term chemical, stain, and water resistance, along with antimicrobial properties. Many natural, unsealed stones do not have stain, etch, or water resistance. The described compositions were developed using a technology of chemical grafting that involves the use of prepolymers, monomers, catalysts, graft initiators, wetting agents, antimicrobial agents, and other ingredients. The composition, when thus applied to the stone surface allows it to obtain a graft polymerization, thereby forming a polymer film that is chemically attached to the natural stone, rather than typical physical bonding of other sealer compositions. The natural stones react with a graft initiator in the composition, which creates the reaction sites on the natural stone surface via free radical mechanisms.
    Type: Application
    Filed: August 11, 2017
    Publication date: February 14, 2019
    Applicant: Questech Corporation
    Inventors: Barry Culkin, Roger Questel, Robert Harrington, Douglas Croteau, Paul Thottathil, Purushoth Kesavan, John Ryan, Satyabrata Mukherjee