Patents by Inventor Kailash C. B. Dangayach

Kailash C. B. Dangayach 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).

  • Polysiloxane modified thermoset compositions
    Patent number: 5284938
    Abstract: A polysiloxane-modified epoxy-based encapsulation composition comprising an epoxy resin, a curing agent for the epoxy resin, a polylactone-polysiloxane block copolymer, and a filler is described. The powder molding compositions provide a low internal stress epoxy composition without significantly sacrificing T.sub.g.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: February 8, 1994
    Assignee: Shell Oil Company
    Inventors: Kailash C. B. Dangayach, Ronald S. Bauer
  • Process for preparing low-chlorine epoxy resins
    Patent number: 5098964
    Abstract: A process is disclosed for preparing a low-chlorine tetrafunctional epoxy resin which employs crystallization of the epoxy resin from solution in a finishing step of the preparation process. The process involves (a) contacting, in a basic reaction medium, epichlorohydrin and a tetraphenol of ethane to produce a reaction product mixture containing a polyglycidyl ether of the tetraphenol of ethane; (b) dissolving the polyglycidyl ether in an organic solvent and, optionally, contacting the polyglycidyl ether with a dehydrochlorination agent; and (c) reducing the temperature of the organic solvent so as to effect crystallization of a low-chlorine fraction of the polyglycidyl ether.
    Type: Grant
    Filed: January 31, 1991
    Date of Patent: March 24, 1992
    Assignee: Shell Oil Company
    Inventors: Ronald S. Bauer, Kailash C. B. Dangayach
  • Process for preparing low-chlorine epoxy resins
    Patent number: 5098965
    Abstract: A process is disclosed for preparing a low-chlorine epoxy resin which employs crystallization of the epoxy from solution in a finishing step of the preparation process. The process involves (a) contacting, in a basic reaction medium, epichlorohydrin and a biphenol to produce a reaction product mixture containing a diglycidyl ether of the biphenol; (b) dissolving the diglycidyl ether in an organic solvent and, optionally, contacting the diglycidyl ether with a dehydrochlorination agent; and (c) reducing the temperature of the organic solvent so as to effect crystallization of a low-chlorine fraction of the diglycidyl ether.
    Type: Grant
    Filed: January 31, 1991
    Date of Patent: March 24, 1992
    Assignee: Shell Oil Company
    Inventors: Ronald S. Bauer, Kailash C. B. Dangayach
  • Polysiloxane-polylactone block copolymer modified thermostat compositions
    Patent number: 5037898
    Abstract: A polysiloxane-modified epoxy-based encapsulation composition comprising an epoxy resin, a curing agent for the epoxy resin, a polylactone-polysiloxane block copolymer, and a filler is described. The powder molding compositions provide a low internal stress epoxy composition without significantly sacrificing T.sub.g.
    Type: Grant
    Filed: February 27, 1990
    Date of Patent: August 6, 1991
    Assignee: Shell Oil Company
    Inventors: Kailash C. B. Dangayach, Ronald S. Bauer
  • Stabilized epoxy resin compositions
    Patent number: 4855340
    Abstract: A composition is described which includes an epoxy resin, a solid particulate filler and 1,2-propylene glycol. The 1,2-propylene glycol is present in an amount effective to suppress filler settle from the epoxy. The composition is particularly suitable for electrical encapsulation applications.
    Type: Grant
    Filed: February 19, 1988
    Date of Patent: August 8, 1989
    Assignee: Shell Oil Company
    Inventor: Kailash C. B. Dangayach
  • Method for determining the amount of oil in a sponge core
    Patent number: 4787983
    Abstract: The oil lost by the core sample and captured by the sponge during sponge coring is extracted from the sponge using a solvent selected from the group consisting of cycloalkanes, ethers, and freons.
    Type: Grant
    Filed: November 17, 1987
    Date of Patent: November 29, 1988
    Assignee: Shell Oil Company
    Inventors: Rocco DiFoggio, William E. Ellington, Kailash C. B. Dangayach