Patents by Inventor Karikath Varma

Karikath 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).

  • FIRE RESISTANT GLAZING
    Publication number: 20100129669
    Abstract: 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: Application
    Filed: October 30, 2007
    Publication date: May 27, 2010
    Applicant: Pilkington Group Limited
    Inventors: Karikath Varma, David Holden, John Richard Holland
  • Fire resistant glazings
    Publication number: 20070026242
    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: Application
    Filed: October 5, 2006
    Publication date: February 1, 2007
    Inventors: John Holland, Karikath Varma, David Holden
  • Fire resistant glazings
    Publication number: 20060254465
    Abstract: 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: Application
    Filed: June 7, 2005
    Publication date: November 16, 2006
    Inventors: John Holland, Karikath Varma, David Holden
  • Fire resistant glazing
    Publication number: 20050255323
    Abstract: 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: Application
    Filed: August 6, 2003
    Publication date: November 17, 2005
    Inventors: Karikath Varma, John Holland, David Holden, Stephen Bond
  • Fire resistant glazings
    Publication number: 20050016742
    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: September 18, 2002
    Publication date: January 27, 2005
    Inventors: Karikath Varma, John Holland, David Holden, Stephen Bond, Allan Dale