Patents by Inventor Prakash D. Patel

Prakash D. 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).

  • Process for preparation of benzene dicarboxylic acids
    Patent number: 6355835
    Abstract: The present invention relates to a process for the preparation of benzene dicarboxylic acids by liquid phase oxidation of Xylene isomers using oxygen or air by oxidising in the presence of acetic acid as solvent, cobalt salt as catalyst and an initiator. The oxidation step is followed by flashing the said reaction mixture to remove volatile substances and cooling and filtering to get crude benzene di-carboxylic acid as a solid product and filtrate. The dicarboxylic acid solid product is recrystallised to get at least 99% pure benzene. The filtrate may be recycled.
    Type: Grant
    Filed: December 8, 1999
    Date of Patent: March 12, 2002
    Assignee: Chemintel (India) Private Limited
    Inventors: Girendra Narain Kulsrestha, Mahendra Pratap Saxena, Ashok Kumar Gupta, Satish Kumar Sharma, Dinesh Prasad Bangwal, Hari Bhagwan Goyal, Rameshwar Prasad, Sanjib Mall, Prakash D. Patel
  • Catalyst and a process for preparing carboxylic acids using the catalyst
    Patent number: 5547905
    Abstract: A catalyst comprising 70-99% by wt. of cobaltic salt and 1-30% by wt. of ferric salt, the acid component of the salt being such as acetate; propionate; naphthenate adipate and phthalate; a process for preparing the above catalyst, and a process for the preparation of carboxylic acids by oxidation of a hydrocarbon with oxygen or air in the presence of the above catalyst.
    Type: Grant
    Filed: July 27, 1994
    Date of Patent: August 20, 1996
    Assignee: Council of Scientific & Industrial Research
    Inventors: Girindra N. Kulsrestha, Mahendra P. Saxena, Ashok K. Gupta, Hari B. Goyal, Rameshwar Prasad, Turuga S. R. Prasada Rao, Prakash D. Patel