Patents by Inventor Sunil Shankar Joshi

Sunil Shankar Joshi 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 carboxylic acids from aliphatic alcohols
    Patent number: 6858753
    Abstract: The present invention provides an improved process for the production of carboxylic acids by the carbonylation of alcohol. The process involves contacting an alcohol with carbon monoxide in the presence of a nickel compound, a heterocyclic organic compound and an iodide promoter to produce the corresponding carboxylic acid. The improvement relates to the use of heterocyclic organic compound as a promoter containing at least two heteroatoms of which at least one is selected independently from S or N, which provides an inexpensive and stable catalyst system.
    Type: Grant
    Filed: March 14, 2002
    Date of Patent: February 22, 2005
    Assignee: Council of Scientific and Industrial Research
    Inventors: Raghunath Vitthal Chaudhari, Sunil Shankar Joshi, Ashutosh Anant Kelkar, Sunil Sadashiv Divekar
  • Process for the preparation of 2-Methyl-2-propene-1-sulfonic acid, sodium salt
    Patent number: 6660882
    Abstract: The present invention provides a process for the preparation of highly pure 2-Methyl-2-propene-1-sulfonic acid, sodium salt in high yield, with very low iron content, by the reaction of distilled sulfur trioxide complexed with a Lewis base in a halogentated solvent, the unreacted sulfur trioxide vapors being removed from the reactor before the mixture is treated with liquefied isobutylene, and neutralization by a base with an iron content within the range of 0 to 20 ppm.
    Type: Grant
    Filed: March 18, 2002
    Date of Patent: December 9, 2003
    Assignee: Council of Scientific and Industrial Research
    Inventors: Prashant Purushottam Barve, Sunil Shankar Joshi, Ravindra William Shinde, Shrikant Madhukar Ghike, Milind Yashwant Gupte, Chandrashekhar Narayan Joshi, Raghavendra Venkatrao Naik
  • Process for the preparation of carboxylic acids from aliphatic alcohols
    Publication number: 20030176732
    Abstract: The present invention provides an improved process for the production of carboxylic acids by the carbonylation of alcohol. The process involves contacting an alcohol with carbon monoxide in the presence of a nickel compound, a heterocyclic organic compound and an iodide promoter to produce the corresponding carboxylic acid. The improvement relates to the use of heterocyclic organic compound as a promoter containing at least two heteroatoms of which at least one is selected independently from S or N, which provides an inexpensive and stable catalyst system.
    Type: Application
    Filed: March 14, 2002
    Publication date: September 18, 2003
    Inventors: Raghunath Vitthal Chaudhari, Sunil Shankar Joshi, Ashutosh Anant Kelkar, Sunil Sadashiv Divekar
  • Process for the preparation of 2-Methyl-2-propene-1-sulfonic acid, sodium salt
    Publication number: 20030176731
    Abstract: The present invention provides a process for the preparation of highly pure 2-Methyl-2-propene-1-sulfonic acid, sodium salt in high yield, with very low iron content, by the reaction of distilled sulfur trioxide complexed with a Lewis base in a halogentated solvent, the unreacted sulfur trioxide vapors being removed from the reactor before the mixture is treated with liquefied isobutylene, and neutralization by a base with an iron content within the range of 0 to 20 ppm.
    Type: Application
    Filed: March 18, 2002
    Publication date: September 18, 2003
    Inventors: Prashant Purushottam Barve, Sunil Shankar Joshi, Ravindra William Shinde, Shrikant Madhukar Ghike, Milind Yashwant Gupte, Chandrashekhar Narayan Joshi, Raghavendra Venkatrao Naik
  • Process for the preparation of 2-acrylamido-2-methyl-1-propanesulfonic acid
    Patent number: 6504050
    Abstract: The present invention provides a process for the preparation of highly pure 2-acrylamido-2-methyl-1-propanesulfonic acid in high yield, with improved appearance, by the reaction of acrylonitrile with more than 98% sulfuric acid or oleum and liquefied isobutylene in presence of weak inorganic acids or organic sulfonic acids.
    Type: Grant
    Filed: March 13, 2002
    Date of Patent: January 7, 2003
    Assignee: Council of Scientific and Industrial Research
    Inventors: Prashant Purushottam Barve, Sunil Shankar Joshi, Ravindra William Shinde, Milind Yashwant Gupte, Chandrashekhar Narayan Joshi, Shrikant Madhukar Ghike, Raghavendra Venkatrao Naik, Rajendra Anantrao Kulkarni, Aruna Narayan Bote