Patents by Inventor Karikath Sukumar Varma

Karikath Sukumar Varma 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: 20220153634
    Abstract: A coated glass substrate comprising: a transparent glass substrate coated with a blocking layer comprising a material having Si—O—Si bonds and a blocking component, wherein the blocking component comprises fluorone and/or a fluorone derivative.
    Type: Application
    Filed: March 27, 2020
    Publication date: May 19, 2022
    Inventors: JACK BROWN, CLAIRE MADIN, DEBORAH RAISBECK, KARIKATH SUKUMAR VARMA
  • Publication number: 20210331968
    Abstract: A corrosion-resistant coated glass substrate suitable for use in a humid environment and a process for producing same, the process comprising providing a soda lime silica glass substrate, providing a liquid coating composition comprising a polysilazane at a concentration of between 0.5% and 80% by weight, contacting one or both surfaces of the glass substrate directly with the coating composition, and curing the coating composition thereby forming a corrosion-resistant coated glass substrate having a silica layer on one or both sides of the glass substrate with a thickness of from 12 nm to 300 nm.
    Type: Application
    Filed: July 12, 2021
    Publication date: October 28, 2021
    Applicant: PILKINGTON GROUP LIMITED
    Inventors: SIMON JAMES HURST, KARIKATH SUKUMAR VARMA, ANNA LOUISE COLLEY, KIERAN JAMES CHEETHAM, PETER MICHAEL HARRIS, SIMON PAUL OLIVER
  • Publication number: 20210114922
    Abstract: A coated glass substrate comprising: a transparent glass substrate coated with a blocking layer comprising a material having Si—O—Si bonds, a polyol and/or diol and a blocking component, wherein the blocking component is a material that is capable of blocking electromagnetic radiation in the wavelength range 10-500 nm.
    Type: Application
    Filed: April 26, 2019
    Publication date: April 22, 2021
    Inventors: DEBORAH RAISBECK, KARIKATH SUKUMAR VARMA, CLAIRE MADIN, JACK BROWN
  • Patent number: 10919800
    Abstract: Methods are disclosed for planarisation of a coated glass substrate by deposition of a silazane based layer thereon. Coated substrates according to the invention exhibit improved properties in terms of reduced roughness, lower haze and higher visible light transmission and the coated surface may be exposed to the external environment, for example as surface 1 or surface 4 of a double glazing unit. The resulting smooth surface is less susceptible to marking and scratch damage, and offers enhanced surface energy (improved hydrophobicity).
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: February 16, 2021
    Assignee: Pilkington Group Limited
    Inventors: Simon James Hurst, Karikath Sukumar Varma
  • Publication number: 20190135686
    Abstract: A corrosion-resistant coated glass substrate is suitable for use in a humid environment. A process for producing same includes providing a soda lime silica glass substrate, providing a liquid coating composition comprising a polysilazane at a concentration of between 0.5% and 80% by weight, contacting one or both surfaces of the glass substrate directly with the coating composition, and curing the coating composition thereby forming a corrosion-resistant coated glass substrate having a silica layer on one or both sides of the glass substrate with a thickness of from 12 nm to 300 nm.
    Type: Application
    Filed: April 26, 2017
    Publication date: May 9, 2019
    Applicant: PILKINGTON GROUP LIMITED
    Inventors: SIMON JAMES HURST, KARIKATH SUKUMAR VARMA, ANNA LOUISE COLLEY, KIERAN JAMES CHEETHAM, PETER MICHAEL HARRIS, SIMON PAUL OLIVER
  • Publication number: 20180127309
    Abstract: The disclosure involves a coated glazing, a method of manufacturing the glazing and the use of a layer based on silica and/or an organo silica deposited on a glazing to achieve a coefficient of kinetic friction between an exterior surface of the layer based on silica and/or an organo silica and a contact surface wiping device that does not substantially change between a dry state and a wet state of the surfaces. Also disclosed is a glazing suitable for combination with a wiping device, the combination of said glazing with a wiping device and the use of the glazing to facilitate a reciprocating motion of a part of a wiping device and/or to facilitate a tilting and/or flipping of a part of a wiping device.
    Type: Application
    Filed: April 13, 2016
    Publication date: May 10, 2018
    Applicant: Pilkington Group Limited
    Inventors: Karikath Sukumar VARMA, Simon James HURST
  • Patent number: 9789667
    Abstract: Fire resistant glazings comprise a fire resistant interlayer based upon a silicate waterglass are characterized by the incorporation of aluminum ions. The aluminate is incorporated as a solution which has been partially neutralized using hydroxycarboxylic acid which is preferably citric acid. The incorporation of aluminum provides glazings have improved fire resistance and impact properties.
    Type: Grant
    Filed: September 1, 2009
    Date of Patent: October 17, 2017
    Assignee: PILKINGTON PLC
    Inventors: Karikath Sukumar Varma, John Richard Holland, David William Holden, Stephen Ian Bond
  • Publication number: 20170121219
    Abstract: Methods are disclosed for planarisation of a coated glass substrate by deposition of a silazane based layer thereon. Coated substrates according to the invention exhibit improved properties in terms of reduced roughness, lower haze and higher visible light transmission and the coated surface may be exposed to the external environment, for example as surface 1 or surface 4 of a double glazing unit. The resulting smooth surface is less susceptible to marking and scratch damage, and offers enhanced surface energy (improved hydrophobicity).
    Type: Application
    Filed: June 30, 2015
    Publication date: May 4, 2017
    Applicant: PILKINGTON GROUP LIMITED
    Inventors: SIMON JAMES HURST, KARIKATH SUKUMAR VARMA
  • Publication number: 20170051948
    Abstract: Solar collector apparatus is described in which solar radiation is collected in a glazed cavity which may also include a transpired solar collector layer. Air warmed in the cavity may be used for space heating within buildings or diverted to heat management systems which facilitate, for example, heat storage. The glazing, particularly coated glazings, improve the performance of the devices by allowing solar energy to enter the cavity and preventing heat loss, and by negating the effect of ambient wind on the transpired solar collector layer.
    Type: Application
    Filed: May 5, 2015
    Publication date: February 23, 2017
    Inventors: ALAN DAVID HAZZARD, KEVIN DAVID SANDERSON, GARY ROBERT NICHOL, KARIKATH SUKUMAR VARMA, ANTHONY MASON SMITH, KURT-HENRIK MULLER
  • Patent number: 9346962
    Abstract: An aqueous mixture for the production of fire resistant glazings comprising: at least one alkali metal silicate, at least one glass, glass-ceramic and/or ceramic additive, and water, wherein the at least one glass, glass-ceramic and/or ceramic additive has at least one boron containing moiety directly or indirectly attached to a surface thereof by covalent or ionic bonding.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: May 24, 2016
    Assignee: Pilkington Group Limited
    Inventors: David William Holden, Stephen Ian Bond, Karikath Sukumar Varma
  • Patent number: 9109164
    Abstract: A transparent fire resistant glazing comprising an intumescent interlayer, wherein the intumescent interlayer comprises an alkali metal silicate and a foam improvement additive, wherein the foam improvement additive comprises a polymer and/or oligomer and/or salts thereof, wherein said polymer, oligomer and/or salts thereof each contain at least one organic moiety having at least one hydrogen-bondable functional group covalently attached thereto.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: August 18, 2015
    Assignee: Pilkington Group Limited
    Inventors: Angela Yuk Fungt Cheung, Karikath Sukumar Varma, David William Holden, John Richard Holland, Stephen Ian Bond
  • Patent number: 9080063
    Abstract: An additive for alkali metal silicate solutions, comprising a quaternary ammonium compound having the general formula (1) R1R2R3R4N+OH?, wherein R1, R2, R3 and R4 which may be the same or different represent alkyl groups, hydroxy-substituted alkyl groups, alkaryl groups, hydroxy-substituted alkaryl groups comprising from 1 to 12 carbon atoms, or groups having the general formula —[CH2]n-N+R5R6R7 wherein n is an integer having a value of from 1 to 12, the group —[CH2]n may be hydroxy-substituted, and R5, R6 and R7 which may be the same or different represent alkyl groups, hydroxy-substituted alkyl groups, alkaryl groups or hydroxy-substituted alkaryl groups comprising from 1 to 12 carbon atoms; with the proviso that at least one of the groups R1, R2, R3, R4, R5, R6 and R7 represents a hydroxy-substituted alkyl group or a hydroxy-substituted alkaryl group comprising at least 2 carbon atoms wherein the hydroxy substituent is not located on a carbon atom which is bonded to a nitrogen atom.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: July 14, 2015
    Assignee: PILKINGTON GROUP LIMITED
    Inventors: Karikath Sukumar Varma, Benjamin Michael Stiefvater-Thomas
  • Publication number: 20150056456
    Abstract: An aqueous mixture for the production of fire resistant glazings comprising: at least one alkali metal silicate, at least one glass, glass-ceramic and/or ceramic additive, and water, wherein the at least one glass, glass-ceramic and/or ceramic additive has at least one boron containing moiety directly or indirectly attached to a surface thereof by covalent or ionic bonding.
    Type: Application
    Filed: February 27, 2013
    Publication date: February 26, 2015
    Applicant: PILKINGTON GROUP LIMITED
    Inventors: David William Holden, Stephen Ian Bond, Karikath Sukumar Varma
  • Publication number: 20120292824
    Abstract: Bilayer materials are produced by drying a solution of an alkali metal silicate upon the surface of a flexible backing material until a flexible silicate film is produced. The film may be separated from the backing material and incorporated into laminated fire resistant glazings. The alkali metal silicate solution preferably comprise a surfactant. The bilayers may be transported or stored before the flexible silicate film is separated and incorporated into a glazing.
    Type: Application
    Filed: August 6, 2012
    Publication date: November 22, 2012
    Applicant: PILKINGTON PLC
    Inventors: Karikath Sukumar Varma, John Richard Holland, David William Holden, Stephen Ian Bond, Allan Stuart Dale
  • Publication number: 20120263903
    Abstract: An additive for alkali metal silicate solutions, comprising a quaternary ammonium compound having the general formula (1) R1R2R3R4N+OH?, wherein R1, R2, R3 and R4 which may be the same or different represent alkyl groups, hydroxy-substituted alkyl groups, alkaryl groups, hydroxy-substituted alkaryl groups comprising from 1 to 12 carbon atoms, or groups having the general formula —[CH2]n-N+R5R6R7 wherein n is an integer having a value of from 1 to 12, the group —[CH2]n may be hydroxy-substituted, and R5, R6 and R7 which may be the same or different represent alkyl groups, hydroxy-substituted alkyl groups, alkaryl groups or hydroxy-substituted alkaryl groups comprising from 1 to 12 carbon atoms; with the proviso that at least one of the groups R1, R2, R3, R4, R5, R6 and R7 represents a hydroxy-substituted alkyl group or a hydroxy-substituted alkaryl group comprising at least 2 carbon atoms wherein the hydroxy substituent is not located on a carbon atom which is bonded to a nitrogen atom.
    Type: Application
    Filed: December 22, 2010
    Publication date: October 18, 2012
    Applicant: PILKINGTON GROUP LIMITED
    Inventors: Karikath Sukumar Varma, Benjamin Michael Stiefvater-Thomas
  • Publication number: 20120205600
    Abstract: A stable aqueous solution for the production of fire resistant glazings comprising: at least one alkali metal silicate; and an aqueous solution of at least one alkali-soluble anion of an acidic or amphoteric oxide and/or a complex thereof; and/or at least one alkali-soluble hydroxide, and/or alkali-soluble complex of elements selected from the group consisting of lithium, magnesium and calcium.
    Type: Application
    Filed: September 3, 2010
    Publication date: August 16, 2012
    Applicant: PILKINGTON GROUP LIMITED
    Inventors: David William Holden, John Richard Holland, Karikath Sukumar Varma, Stephen Ian Bond
  • Publication number: 20120208921
    Abstract: A transparent fire resistant glazing comprising an intumescent interlayer, wherein the intumescent interlayer comprises an alkali metal silicate and a foam improvement additive, wherein the foam improvement additive comprises a polymer and/or oligomer and/or salts thereof, wherein said polymer, oligomer and/or salts thereof each contain at least one organic moiety having at least one hydrogen-bondable functional group covalently attached thereto.
    Type: Application
    Filed: October 12, 2010
    Publication date: August 16, 2012
    Applicant: PILKINGTON GROUP LIMITED
    Inventors: Angela Yuk Fungt Cheung, Karikath Sukumar Varma, David William Holden, John Richard Holland, Stephen Ian Bond
  • Publication number: 20120121912
    Abstract: A laminated structure comprising at least one glazing pane, at least one interlayer, and a seal covering at least one edge of the interlayer, wherein the seal comprises a nano-particulate silicon oxide.
    Type: Application
    Filed: June 14, 2010
    Publication date: May 17, 2012
    Applicant: PILKINGTON GROUP LIMITED
    Inventors: Karikath Sukumar Varma, Benjamin Michael Stiefvater-Thomas
  • Patent number: 7947384
    Abstract: Solutions comprising a sodium silicate waterglass having a modulus of less than 3 and at least 8% by weight of an organic polyhydroxy compound such as glycerol are useful in the production of interlayers used in fire resistant glass laminates. The solutions are dried on a flat surface such as glass to produce a clear intumescent interlayer having improved impact resistance. The dried interlayer may be removed from the surface in the form of an elastomeric material which may also be used as an interlayer in a fire resistant glazing.
    Type: Grant
    Filed: October 5, 2006
    Date of Patent: May 24, 2011
    Assignee: Pilkington PLC
    Inventors: John Richard Holland, Karikath Sukumar Varma, David William Holden
  • Publication number: 20110045280
    Abstract: The addition of nanoparticulate silica to sealants which are applied to the exposed edges of fire resistant laminated glazings provides an improved seal. Preferably the silica is present as an Ormosil dispersed in a polymerisable organic medium. Methods for applying such a medium to the edges of a glazing and polymerising it in situ are also claimed. The seals can be used to replace known metal tapes. The use of transparent seals provides a seal having an improved appearance.
    Type: Application
    Filed: February 24, 2009
    Publication date: February 24, 2011
    Applicant: PILKINGTON GROUP LIMITED
    Inventors: Karikath Sukumar Varma, Benjamin Michael Stiefvater-Thomas