Patents by Inventor John Richard Holland
John Richard Holland 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: 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
-
Patent number: 9546514Abstract: Fire resistant glazings having improved properties comprising a silicate based interlayer which contains from 35% to 43% by weight of water may be produced using a cast in place process. The amount of water in the interlayer is reduced by concentrating the silicate solution or by introducing silica in the form of a silica sol. Preferably a mixture of an aqueous sol and an organosol is used. Polyhydroxy compounds and saccharides may be incorporated into the interlayer to improve the properties thereof and to reduce the water content. The silicate based formulations are pourable and can be used in a cast in place production process and subsequently cured to form an optically clear interlayer.Type: GrantFiled: June 16, 2014Date of Patent: January 17, 2017Assignee: Pilkington Group LimitedInventors: Karikath Su Varma, David Holden, John Richard Holland
-
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
-
Patent number: 8932508Abstract: The incorporation of polyvalent metal ions into a silicate based interlayer in a laminated fire resistant glazing produced using a cast in place process provides an improvement in the properties of those glazings. The preferred metal ions are aluminium ions and zirconium ions. The preferred polyvalent metal compounds are those which are disclosed in EP 1206349 and WO 2004/014813.Type: GrantFiled: October 30, 2007Date of Patent: January 13, 2015Assignee: Pilkington Group LimitedInventors: Karikath Su Varma, David Holden, John Richard Holland
-
Publication number: 20140360652Abstract: Fire resistant glazings having improved properties comprising a silicate based interlayer which contains from 35% to 43% by weight of water may be produced using a cast in place process. The amount of water in the interlayer is reduced by concentrating the silicate solution or by introducing silica in the form of a silica sol. Preferably a mixture of an aqueous sol and an organosol is used. Polyhydroxy compounds and saccharides may be incorporated into the interlayer to improve the properties thereof and to reduce the water content. The silicate based formulations are pourable and can be used in a cast in place production process and subsequently cured to form an optically clear interlayer.Type: ApplicationFiled: June 16, 2014Publication date: December 11, 2014Applicant: PILKINGTON GROUP LIMITEDInventors: Karikath Su Varma, David Holden, John Richard Holland
-
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
-
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
-
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
-
Publication number: 20120076966Abstract: A fire-resistant laminated glazing comprising at least two glazing panes and at least one transparent intumescent interlayer between the glazing panes, said glazing panes being separated by a spacer extending at least partially around their peripheries so as to define a cavity to contain said interlayer, wherein the spacer comprises a shim for controlling the separation between the glazing panes to a predetermined distance and a rubber portion at least partially enclosing the shim, and wherein the interlayer comprises an alkali metal silicate.Type: ApplicationFiled: May 18, 2010Publication date: March 29, 2012Applicant: PILKINGTON GROUP LIMITEDInventors: John Richard Holland, David William Holden, Heinz Wilhelm Holscher
-
Publication number: 20120061008Abstract: Fire resistant glazings having improved properties comprising a silicate based interlayer which contains from 35% to 43% by weight of water may be produced using a cast in place process. The amount of water in the interlayer is reduced by concentrating the silicate solution or by introducing silica in the form of a silica sol. Preferably a mixture of an aqueous sol and an organosol is used. Polyhydroxy compounds and saccharides may be incorporated into the interlayer to improve the properties thereof and to reduce the water content. The silicate based formulations are pourable and can be used in a cast in place production process and subsequently cured to form an optically clear interlayer.Type: ApplicationFiled: November 21, 2011Publication date: March 15, 2012Applicant: PILKINGTON GROUP LIMITEDInventors: Karikath Su Varma, David Holden, John Richard Holland
-
Publication number: 20110183145Abstract: Fire resistant glazings having improved properties comprising a silicate based interlayer which contains from 35% to 43% by weight of water may be produced using a cast in place process. The amount of water in the interlayer is reduced by concentrating the silicate solution or by introducing silica in the form of a silica sol. Preferably a mixture of an aqueous sol and an organosol is used. Polyhydroxy compounds and saccharides may be incorporated into the interlayer to improve the properties thereof and to reduce the water content. The silicate based formulations are pourable and can be used in a cast in place production process and subsequently cured to form an optically clear interlayer.Type: ApplicationFiled: October 30, 2007Publication date: July 28, 2011Applicant: PILKINGTON GROUP LIMITEDInventors: Karikath Su Varma, David Holden, John Richard Holland
-
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
-
Publication number: 20100129669Abstract: The incorporation of polyvalent metal ions into a silicate based interlayer in a laminated fire resistant glazing produced using a cast in place process provides an improvement in the properties of those glazings. The preferred metal ions are aluminium ions and zirconium ions. The preferred polyvalent metal compounds are those which are disclosed in EP 1206349 and WO 2004/014813.Type: ApplicationFiled: October 30, 2007Publication date: May 27, 2010Applicant: Pilkington Group LimitedInventors: Karikath Varma, David Holden, John Richard Holland
-
Publication number: 20090317618Abstract: Fire resistant glazings comprise a fire resistant interlayer based upon a silicate waterglass are characterised by the incorporation of aluminium ions. The aluminate is incorporated as a solution which has been partially neutralised using hydroxycarboxylic acid which is preferably citric acid. The incorporation of aluminium provides glazings have improved fire resistance and impact properties.Type: ApplicationFiled: September 1, 2009Publication date: December 24, 2009Inventors: Karikath Sukumar Varma, John Richard Holland, David William Holden, Stephen Ian Bond
-
Patent number: 7334435Abstract: Process for the production of an intumescent fire resistant layer by drying a waterglass solution on the surface of a glass substrate are carried out in the presence of a salt of a carbonic acid or an ?-hydroxy carboxylic acid such as potassium citrate. The drying is preferably carried out at a rate which reduces of pH of the solution by no more than 2 units during an initial drying period of 5 hours. The resulting interlayers provide improved fire resistance.Type: GrantFiled: September 17, 2001Date of Patent: February 26, 2008Assignee: Pilkington plcInventors: Karikath Sukumar Varma, John Richard Holland, David William Holden
-
Patent number: 7282092Abstract: Novel waterglass compositions comprise a zirconium containing anionic aggregate, preferably potassium zirconium carbonate or ammonium zirconium carbonate, in a quantity sufficient to provide at least 0.5% as zirconium metal. The compositions can be dried and/or gelled to form optically clear interlayers useful in the production of fire resistant glass laminates. The incorporation of the zirconium containing aggregate improves the fire resistant performance of the laminates.Type: GrantFiled: June 7, 2005Date of Patent: October 16, 2007Assignee: Pilkington PLCInventors: John Richard Holland, Karikath Sukumar Varma, David William Holden
-
Patent number: 7189285Abstract: 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: March 16, 2001Date of Patent: March 13, 2007Assignee: Pilkington PLCInventors: John Richard Holland, Karikath Sukumar Varma, David William Holden
-
Patent number: 6929691Abstract: Novel waterglass compositions comprise a zirconium containing anionic aggregate, preferably potassium zirconium carbonate or ammonium zirconium carbonate, in a quantity sufficient to provide at least 0.5% as zirconium metal. The compositions can be dried and/or gelled to form optically clear interlayers useful in the production of fire resistant glass laminates. The incorporation of the zirconium containing aggregate improves the fire resistant performance of the laminates.Type: GrantFiled: August 1, 2000Date of Patent: August 16, 2005Assignee: Pilkington plcInventors: John Richard Holland, Karikath Sukumar Varma, David William Holden
-
Publication number: 20030186063Abstract: Process for the production of an intumescent fire resistant layer by drying a waterglass solution on the surface of a glass substrate are carried out in the presence of a salt of a carbonic acid or an &agr;-hydroxy carboxylic acid such as potassium citrate. The drying is preferably carried out at a rate which reduces of pH of the solution by no more than 2 units during an initial drying period of 5 hours. The resulting interlayers provide improved fire resistance.Type: ApplicationFiled: March 13, 2003Publication date: October 2, 2003Inventors: Karikath Sukumar Varma, John Richard Holland, David William Holden
-
Publication number: 20030180543Abstract: 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: ApplicationFiled: September 17, 2002Publication date: September 25, 2003Inventors: John Richard Holland, Karikath Sukumar Varma, David William Holden