Patents by Inventor Gullapalli Kumaraswamy

Gullapalli Kumaraswamy 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 the preparation of N-(2,3-Dihydrobenzo[1,4]dioxin-2-carbonyl)piperazine
    Patent number: 6608200
    Abstract: Described herein is an improved process for the preparation of N-(2,3-Dihydrobenzo[1,4]dioxin-2-carbonyl)piperazine which includes heating a reaction mixture ethyl of 2,3-dihydrobenzo[1,4]dioxin-2-carboxylate and piperazine. The reaction mixture is then subjected to series of washes and extraction to yield N-(2,3-Dihydrobenzo[1,4]dioxin-2-carbonyl)piperazine having a purity of greater than 99.9%.
    Type: Grant
    Filed: October 7, 2002
    Date of Patent: August 19, 2003
    Assignee: Council of Scientific & Industrial Research
    Inventors: Malladi Pardhasaradhi, Gullapalli Kumaraswamy, Arun Kanti Das, Nivedita Jena, Chembumkulam Kamalakshyamma Snehalatha Nair, Mudiganti Naga Venkata Sastry
  • Process for the preparation of ethyl 2,3-dihydrobenzo[1,4]dioxin-2-carboxylate
    Patent number: 6555695
    Abstract: The present invention relates to an improved process for the preparation of ethyl 2,3-dihydrobenzo[1,4]dioxin-2-carboxylate. More particularly the present invention provides a process for the preparation of ethyl 2,3-dihydrobenzo[1,4]dioxin-2-carboxylate in hydrocarbon solvent in the presence of a base and catalytic amount of a phase transfer catalyst.
    Type: Grant
    Filed: February 14, 2002
    Date of Patent: April 29, 2003
    Assignee: Council of Scientific & Industrial Research
    Inventors: Malladi Pardhasaradhi, Gullapalli Kumaraswamy, Arun Kanti Das, Nivedita Jena, Chembumkulam Kamalakshyamma Snehalatha Nair