Patents by Inventor Gautam A. Patel

Gautam A. Patel 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: 5503935
    Abstract: A primerless silicone hardcoat composition is provided which utilizes an acrylated or methacrylated polyurethane or an acrylic copolymer such as an acrylic polyol as an adhesion promoter in combination with silicone hardcoat ingredients.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: April 2, 1996
    Assignee: General Electric Company
    Inventor: Gautam A. Patel
  • Patent number: 5411807
    Abstract: Heat curable primerless silicone compositions are provided comprising an aqueous/organic solvent silicone dispersion in combination with an adhesion promoter, such as acrylate or methacrylate ester, for example, a caprolactone acrylate or methacrylate adhesion promoter. Composites of a thermoplastic substrate, such as a polycarbonate, and the thermally cured primerless silicone compositions are also provided.
    Type: Grant
    Filed: May 9, 1994
    Date of Patent: May 2, 1995
    Assignee: General Electric Company
    Inventors: Gautam A. Patel, Steven J. Kubisen
  • Patent number: 5409778
    Abstract: Improved adhesion of abrasion-resistant top coats such as silicone hardcoats to thermoplastic (preferably polycarbonate) surfaces is obtained by employing as a primer a mixture of poly(methyl methacrylate) with a copolymer of methyl methacrylate and at least one other alkyl acrylate, said copolymer having a glass transition temperature up to about 75.degree. C. The improvement in adhesion is particularly noticeable for dip-coated and flow-coated substrates having top coats of variable thickness.
    Type: Grant
    Filed: February 22, 1994
    Date of Patent: April 25, 1995
    Assignee: General Electric Company
    Inventor: Gautam A. Patel
  • Patent number: 5349002
    Abstract: A primerless silicone hardcoat composition is provided which utilizes polycaprolactone polyol as an adhesion promoter in combination with silicone hardcoat ingredients,
    Type: Grant
    Filed: December 2, 1992
    Date of Patent: September 20, 1994
    Assignee: General Electric Company
    Inventor: Gautam A. Patel
  • Patent number: 5318850
    Abstract: UV curable hardcoat compositions are provided which impart improved abrasion resistance to thermoplastic substrates when applied and cured thereon. Enhancement in abrasion and weathering properties have been achieved by the use of certain UV curable branched or carbocyclic monoacrylates, such as isobornyl acrylate.
    Type: Grant
    Filed: July 29, 1992
    Date of Patent: June 7, 1994
    Assignee: General Electric Company
    Inventors: James E. Pickett, Gautam A. Patel
  • Patent number: 5214085
    Abstract: Non-gelling, radiation curable liquid coating compositions comprise at least one acrylic ester, preferably a mixture of a silyl acrylate and at least one polyfunctional acrylate; silica, preferably having an average particle size in the range of about 15-30 nm.; an initiator for ultraviolet radiation-induced curing and a hindered piperidyl ester such as bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate. The compositions also preferably contain an ultraviolet stabilizer, typically a benzophenone or benzotriazole. When employed as coatings for resinous (especially polycarbonate) articles and cured, said compositions provide abrasion resistance and weatherability.
    Type: Grant
    Filed: February 3, 1992
    Date of Patent: May 25, 1993
    Assignee: General Electric Company
    Inventors: Gautam A. Patel, Martin A. Trapp
  • Patent number: 5104732
    Abstract: Thermoplastic sheets are provided such as polymethylmethacrylate sheets and polycarbonate sheets which exhibit improved water wetting and water spreading characteristics. A method for making such articles is also provided which can be employed to make the thermoplastic structured sheets useful in greenhouses and for other roofing and glazing applications such as sun glasses and ski goggles.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: April 14, 1992
    Assignee: General Electric Company
    Inventor: Gautam A. Patel
  • Patent number: 5041313
    Abstract: A method is provided for making a silicone hardcoat-thermoplastic composite, such as a silicone-polycarbonate composite utilizing a solution of a polyacrylic resin and a solvent blend of a strong and weak solvent as determined by the solubility characteristics of the polyacrylic resin in the respective solvents. The primer composition allows for a direct wet-on-wet application of the primer onto an aromatic thermoplastic substrate followed by the application of the silicone hardcoat composition which eliminates a baking and cooling step in the formation of the silicone hardcoat-aromatic thermoplastic substrate composite.
    Type: Grant
    Filed: February 1, 1991
    Date of Patent: August 20, 1991
    Assignee: General Electric Company
    Inventor: Gautam A. Patel
  • Patent number: 4994318
    Abstract: Thermoplastic substrates such as structured sheet and film can be made having enhanced water spreading characteristics, by solvent impregnation or treatment with colloidal silica containing coating compositions which also can contain an acrylic resin.
    Type: Grant
    Filed: January 17, 1989
    Date of Patent: February 19, 1991
    Assignee: General Electric Company
    Inventor: Gautam A. Patel
  • Patent number: 4990376
    Abstract: An improved silica-containing curable coating composition is described herein. The composition has an alkaline pH and contains a dialkyldialkoxysilane/alkyltrialkoxysilane mixture and a dispersion of ammonium-stabilized colloidal silica having an average particle size no greater than about 5-10 millimicrons. Methods for preparing such compositions are also disclosed, as are thermoplastic articles which include the cured protective coatings.
    Type: Grant
    Filed: November 24, 1989
    Date of Patent: February 5, 1991
    Assignee: General Electric Company
    Inventor: Gautam A. Patel
  • Patent number: 4942065
    Abstract: An improved method for forming a protective coating on a plastic substrate is disclosed, comprising the application of a curable coating composition which contains at least one alkyltrialkoxysilane in a water/organic solvent dispersion of the colloidal silica onto the substrate, and then curing the composition at elevated temperatures with an effective amount of a tetrabutylammonium carboxylate catalyst such as tetra-n-butylammonium acetate. This invention also includes improved curable silicone coating compositions containing such a catalyst.
    Type: Grant
    Filed: January 16, 1990
    Date of Patent: July 17, 1990
    Assignee: General Electric Company
    Inventors: Arnold Factor, Gautam A. Patel
  • Patent number: 4914143
    Abstract: An improved silica-containing curable coating composition is described herein. The composition has an alkaline pH and contains a dialkyldialkoxysilane/alkyltrialkoxysilane mixture and a dispersion of ammonium-stabilized colloidal silica having an average particle size no greater than about 5-10 millimicrons. Methods for preparing such compositions are also disclosed, as are thermoplastic articles which include the cured protective coatings.
    Type: Grant
    Filed: April 25, 1988
    Date of Patent: April 3, 1990
    Assignee: General Electric Company
    Inventor: Gautam A. Patel
  • Patent number: 4863520
    Abstract: An improved method for forming a protective coating on a plastic substrate is disclosed, comprising the application of a curable coating composition which contains at least one alkyltrialkoxysilane in a water/organic solvent dispersion of the colloidal silica onto the substrate, and then curing the composition at elevated temperatures with an effective amount of a tetrabutylammonium carboxylate catalyst such as tetra-n-butylammonium acetate. This invention also includes improved curable silicone coating compositions containing such a catalyst.
    Type: Grant
    Filed: July 5, 1988
    Date of Patent: September 5, 1989
    Assignee: General Electric Company
    Inventors: Arnold Factor, Gautam A. Patel
  • Patent number: 4680232
    Abstract: Abrasion resistant coating compositions with improved weatherability are described which comprise water/alcohol solutions of a partial condensate and a colloidal dispersion of colloidal silica and colloidal metal. Improved weatherability is provided by a silylated ultraviolet light absorbing agent which is incorporated in the coating.
    Type: Grant
    Filed: January 2, 1986
    Date of Patent: July 14, 1987
    Assignee: General Electric Company
    Inventors: Arnold Factor, Gautam A. Patel