Patents by Inventor Tridip Goswami

Tridip Goswami 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 alkali salt of carboxy alkyl cellulose
    Patent number: 5801239
    Abstract: This invention relates to a process for the preparation of alkali salt of carboxyalkyl cellulose with good solubility in salt water which is useful for pertroleum drilling muds, which comprises (a) powdering high alpha cellulose obtained from fast growing plants or bamboo pulp, (b) preparing the alkali metal salt of cellulose by mixing the high alpha cellulose pulp obtained from fast growing plant or bamboo with an alkalinating agent in the presence of an inert organic solvent, (c) etherifying the prepared alkali cellulose to alkali metal salt of cellulose with an etherifying agent at a temperature in the range of 70.degree.-80.degree. C., (d) recovering the alkali metal salt of carboxyalkyl cellulose and (e) drying the resulting alkali metal salt of carboxalkyl cellulose.
    Type: Grant
    Filed: January 17, 1997
    Date of Patent: September 1, 1998
    Assignee: Council of Scientific & Industrial Research
    Inventors: Chowdhury Nath Saikia, Tridip Goswami, Anil Chandra Ghosh