Patents by Inventor Suresh Shanumgam

Suresh Shanumgam 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).

  • Methods for purifying 2-aryl-3,3-bis(hydroxyaryl)phthalimidines
    Patent number: 7790832
    Abstract: A method for purifying a 2-aryl-3,3-bis(hydroxyaryl)phthalimidine comprises contacting a crude 2-aryl-3,3-bis(hydroxyaryl)phthalimidine with a purification agent, removing a 2-aryl-3-(aminoaryl)-3-(hydroxyaryl)phthalimidine compound from the crude 2-aryl-3,3-bis(hydroxyaryl)phthalimidine, and producing a purified 2-aryl-3,3-bis(hydroxyaryl)phthalimidine product comprising less than 200 parts per million of the 2-aryl-3-(aminoaryl)-3-(hydroxyaryl)phthalimidine compound. The purification agent is selected from the group consisting of an acidic material, an organic acid chloride, an organic anhydride, or a combination thereof. The 2-aryl-3-(aminoaryl)-3-(hydroxyaryl)phthalimidine compound has a formula: wherein each R1 is independently selected from a group consisting of a hydrocarbyl radical, a nitro radical, and a halogen atom; “a” is an integer from 0 to 4; and Ar1 and Ar2 are independently at each occurrence an aromatic radical.
    Type: Grant
    Filed: September 4, 2007
    Date of Patent: September 7, 2010
    Assignee: Sabic Innovative Plastics IP B.V.
    Inventors: Balakrishnan Ganesan, Pradeep Jeevaji Nadkarni, Kumar Arun Satyanarayana, Venkata Rama Narayanan Ganapathy Bhotla, Suresh Shanumgam, Gurram Kishan, Ravindra Vikram Singh
  • METHODS FOR PURIFYING 2-ARYL-3,3-BIS(HYDROXYARYL)PHTHALIMIDINES
    Publication number: 20080058497
    Abstract: A method for purifying a 2-aryl-3,3-bis(hydroxyaryl)phthalimidine comprises contacting a crude 2-aryl-3,3-bis(hydroxyaryl)phthalimidine with a purification agent, removing a 2-aryl-3-(aminoaryl)-3-(hydroxyaryl)phthalimidine compound from the crude 2-aryl-3,3-bis(hydroxyaryl)phthalimidine, and producing a purified 2-aryl-3,3-bis(hydroxyaryl)phthalimidine product comprising less than 200 parts per million of the 2-aryl-3-(aminoaryl)-3-(hydroxyaryl)phthalimidine compound. The purification agent is selected from the group consisting of an acidic material, an organic acid chloride, an organic anhydride, or a combination thereof. The 2-aryl-3-(aminoaryl)-3-(hydroxyaryl)phthalimidine compound has a formula: wherein each R1 is independently selected from a group consisting of a hydrocarbyl radical, a nitro radical, and a halogen atom; “a” is an integer from 0 to 4; and Ar1 and Ar2 are independently at each occurrence an aromatic radical.
    Type: Application
    Filed: September 4, 2007
    Publication date: March 6, 2008
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Balakrishnan Ganesan, Pradeep Nadkarni, Arun Kumar, Ramanarayanan V., Suresh Shanumgam, Gurram Kishan, Ravindra Singh