Patents by Inventor Manisha Jagdeeshrao Vaidya

Manisha Jagdeeshrao Vaidya 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).

  • Single step hydrogenation of nitrobenzene to p-aminophenol
    Patent number: 6403833
    Abstract: The present invention provides a single step process for the preparation of p-aminophenol by hydrogenation of nitrobenzene in presence of an aqueous acid over a mono or bimetallic nickel catalyst at a temperature in the range of 80-120° C. for a period of 1 to 4 hrs. The resulting reaction mixture is extracted with an organic solvent like ethyl acetate, cyclohexane or toluene to separate the aqueous layer containing PAP and neutralizing it with ammonia solution to recover the solid p-aminophenol.
    Type: Grant
    Filed: January 30, 2001
    Date of Patent: June 11, 2002
    Assignee: Council of Scientific and Industrial Research
    Inventors: Chandrashekhar Vasant Rode, Manisha Jagdeeshrao Vaidya, Raghunath Vitthal Chaudhari
  • Single step process for the preparation of p-aminophenol
    Patent number: 6028227
    Abstract: The present invention provides a single step process for the preparation of p-aminophenol by contacting a mixture of nitrobenzene and water with hydrogen over a solid acid catalyst, terminating the reaction to obtain a reaction mixture containing the product, extracting the reaction mixture with an organic solvent, separating the aqueous layer containing the product, and then concentrating the aqueous layer by any conventional method to obtain the product.
    Type: Grant
    Filed: February 24, 1999
    Date of Patent: February 22, 2000
    Assignee: Council of Scientific & Industrial Research
    Inventors: Raghunath Vitthal Chaudhari, Sunil Sadashiv Divekar, Manisha Jagdeeshrao Vaidya, Chandrashekar Vasant Rode