Patents by Inventor Raina Gupta

Raina Gupta 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 preparing 1,1,1-tris(4-hydroxyphenyl)alkanes
    Patent number: 7304189
    Abstract: A method for preparing 1,1,1,-tris(4-hydroxyphenyl)alkanes generally comprises reacting a mixture of an aromatic hydroxy compound and a ketone in the presence of at least one ion exchange resin catalyst and optionally a co-catalyst to produce the 1,1,1-tris(4-hydroxyphenyl)alkanes of formula:
    Type: Grant
    Filed: January 31, 2005
    Date of Patent: December 4, 2007
    Assignee: General Electric Company
    Inventors: Adil Minoo Dhalla, Raina Gupta, Gurram Kishan, Yongcheng Li, G. V. Ramanarayanan
  • Methods for preparing 1,1,1-tris(4-hydroxyphenyl)alkanes
    Publication number: 20060173222
    Abstract: A method for preparing 1,1,1,-tris(4-hydroxyphenyl)alkanes generally comprises reacting a mixture of an aromatic hydroxy compound and a ketone in the presence of at least one ion exchange resin catalyst and optionally a co-catalyst to produce the 1,1,1-tris(4-hydroxyphenyl)alkanes of formula:
    Type: Application
    Filed: January 31, 2005
    Publication date: August 3, 2006
    Inventors: Adil Dhalla, Raina Gupta, Gurram Kishan, Yongcheng Li, G.V. Ramanarayanan