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).
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Publication number: 20220153634Abstract: 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: ApplicationFiled: March 27, 2020Publication date: May 19, 2022Inventors: JACK BROWN, CLAIRE MADIN, DEBORAH RAISBECK, KARIKATH SUKUMAR VARMA
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Publication number: 20210331968Abstract: 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: ApplicationFiled: July 12, 2021Publication date: October 28, 2021Applicant: PILKINGTON GROUP LIMITEDInventors: SIMON JAMES HURST, KARIKATH SUKUMAR VARMA, ANNA LOUISE COLLEY, KIERAN JAMES CHEETHAM, PETER MICHAEL HARRIS, SIMON PAUL OLIVER
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Publication number: 20210114922Abstract: 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: ApplicationFiled: April 26, 2019Publication date: April 22, 2021Inventors: DEBORAH RAISBECK, KARIKATH SUKUMAR VARMA, CLAIRE MADIN, JACK BROWN
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Patent number: 10919800Abstract: 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: GrantFiled: June 30, 2015Date of Patent: February 16, 2021Assignee: Pilkington Group LimitedInventors: Simon James Hurst, Karikath Sukumar Varma
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Publication number: 20190135686Abstract: 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: ApplicationFiled: April 26, 2017Publication date: May 9, 2019Applicant: PILKINGTON GROUP LIMITEDInventors: SIMON JAMES HURST, KARIKATH SUKUMAR VARMA, ANNA LOUISE COLLEY, KIERAN JAMES CHEETHAM, PETER MICHAEL HARRIS, SIMON PAUL OLIVER
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Publication number: 20180127309Abstract: 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: ApplicationFiled: April 13, 2016Publication date: May 10, 2018Applicant: Pilkington Group LimitedInventors: Karikath Sukumar VARMA, Simon James HURST
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Patent number: 9789667Abstract: 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: GrantFiled: September 1, 2009Date of Patent: October 17, 2017Assignee: PILKINGTON PLCInventors: Karikath Sukumar Varma, John Richard Holland, David William Holden, Stephen Ian Bond
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Publication number: 20170121219Abstract: 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: ApplicationFiled: June 30, 2015Publication date: May 4, 2017Applicant: PILKINGTON GROUP LIMITEDInventors: SIMON JAMES HURST, KARIKATH SUKUMAR VARMA
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Publication number: 20170051948Abstract: 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: ApplicationFiled: May 5, 2015Publication date: February 23, 2017Inventors: ALAN DAVID HAZZARD, KEVIN DAVID SANDERSON, GARY ROBERT NICHOL, KARIKATH SUKUMAR VARMA, ANTHONY MASON SMITH, KURT-HENRIK MULLER
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Patent number: 9346962Abstract: 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: GrantFiled: February 27, 2013Date of Patent: May 24, 2016Assignee: Pilkington Group LimitedInventors: David William Holden, Stephen Ian Bond, Karikath Sukumar Varma
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Patent number: 9109164Abstract: 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: GrantFiled: October 12, 2010Date of Patent: August 18, 2015Assignee: Pilkington Group LimitedInventors: Angela Yuk Fungt Cheung, Karikath Sukumar Varma, David William Holden, John Richard Holland, Stephen Ian Bond
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Patent number: 9080063Abstract: 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: GrantFiled: December 22, 2010Date of Patent: July 14, 2015Assignee: PILKINGTON GROUP LIMITEDInventors: Karikath Sukumar Varma, Benjamin Michael Stiefvater-Thomas
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Publication number: 20150056456Abstract: 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: ApplicationFiled: February 27, 2013Publication date: February 26, 2015Applicant: PILKINGTON GROUP LIMITEDInventors: David William Holden, Stephen Ian Bond, Karikath Sukumar Varma
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Publication number: 20120292824Abstract: 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: ApplicationFiled: August 6, 2012Publication date: November 22, 2012Applicant: PILKINGTON PLCInventors: Karikath Sukumar Varma, John Richard Holland, David William Holden, Stephen Ian Bond, Allan Stuart Dale
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Publication number: 20120263903Abstract: 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: ApplicationFiled: December 22, 2010Publication date: October 18, 2012Applicant: PILKINGTON GROUP LIMITEDInventors: Karikath Sukumar Varma, Benjamin Michael Stiefvater-Thomas
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Publication number: 20120205600Abstract: 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: ApplicationFiled: September 3, 2010Publication date: August 16, 2012Applicant: PILKINGTON GROUP LIMITEDInventors: David William Holden, John Richard Holland, Karikath Sukumar Varma, Stephen Ian Bond
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Publication number: 20120208921Abstract: 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: ApplicationFiled: October 12, 2010Publication date: August 16, 2012Applicant: PILKINGTON GROUP LIMITEDInventors: Angela Yuk Fungt Cheung, Karikath Sukumar Varma, David William Holden, John Richard Holland, Stephen Ian Bond
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Publication number: 20120121912Abstract: 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: ApplicationFiled: June 14, 2010Publication date: May 17, 2012Applicant: PILKINGTON GROUP LIMITEDInventors: Karikath Sukumar Varma, Benjamin Michael Stiefvater-Thomas
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Patent number: 7947384Abstract: 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: GrantFiled: October 5, 2006Date of Patent: May 24, 2011Assignee: Pilkington PLCInventors: John Richard Holland, Karikath Sukumar Varma, David William Holden
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Publication number: 20110045280Abstract: 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: ApplicationFiled: February 24, 2009Publication date: February 24, 2011Applicant: PILKINGTON GROUP LIMITEDInventors: Karikath Sukumar Varma, Benjamin Michael Stiefvater-Thomas