Patents by Inventor Arun Kumar Chattopadhyay

Arun Kumar Chattopadhyay 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).

  • Method for the production of metallic flake pigments
    Patent number: 6464769
    Abstract: A method of manufacturing metallic, especially aluminum flake pigments comprises comminuting metallic flake particles in an inert solvent such as mineral spirit and in-line screening of the slurry thus formed in at least two in-line cylindrical rotary screens with different mesh size. The screening system is fully enclosed to avoid solvent emissions. The finished product has consistent flake particle size distribution with brighter metallic finishes than conventionally produced products.
    Type: Grant
    Filed: April 3, 2001
    Date of Patent: October 15, 2002
    Assignees: US Aluminum Inc., Shamrock Aluminium Limited, Canbro INC
    Inventors: Arun Kumar Chattopadhyay, Talal Soufanati, Michel Moffatt, Thomas Aquinas Barry, Samir Sanyal
  • Hardened porous ammonium nitrate
    Patent number: 6398888
    Abstract: The present invention is directed to hardening ammonium nitrate by combining ammonium nitrate with a functionally active polymer. The functionally active polymer may be combined with ammonium nitrate by itself as a shell or in intermixed with the ammonium nitrate. The invention is found useful in hardening ammonium nitrate for use in explosives.
    Type: Grant
    Filed: December 7, 2000
    Date of Patent: June 4, 2002
    Assignee: ICI Canada, Inc.
    Inventor: Arun Kumar Chattopadhyay
  • Method for the production of metallic flake pigments
    Publication number: 20020005144
    Abstract: A method of manufacturing metallic, especially aluminum flake pigments comprises comminuting metallic flake particles in an inert solvent such as mineral spirit and in-line screening of the slurry thus formed in at least two in-line cylindrical rotary screens with different mesh size. The screening system is fully enclosed to avoid solvent emissions. The finished product has consistent flake particle size distribution with brighter metallic finishes than conventionally produced products.
    Type: Application
    Filed: April 3, 2001
    Publication date: January 17, 2002
    Inventors: Arun Kumar Chattopadhyay, Talal Soufanati, Michel Moffatt, Thomas Aquinas Barry, Samir Sanyal
  • Production of pigments
    Patent number: 6235104
    Abstract: Metal pigment, especially aluminum pigment is produced in a non toxic environment by milling and/or blending in an inert medium comprising transesterified alkyl, especially methyl esters of vegetable oils selected from soybean oil, cotton seed oil and linseed oil. The metallic pigments produced are of improved quality and appearance. They have improved brightness and the non-leafing pigments produced have highly leafing characteristics.
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: May 22, 2001
    Assignee: Dahlia Ireland Limited
    Inventors: Arun Kumar Chattopadhyay, Thomas Aquinas Barry
  • Hardened porous ammonium nitrate
    Publication number: 20010000200
    Abstract: The present invention is directed to hardening ammonium nitrate by combining ammonium nitrate with a functionally active polymer. The functionally active polymer may be combined with ammonium nitrate by itself as a shell or in intermixed with the ammonium nitrate. The invention is found useful in hardening ammonium nitrate for use in explosives.
    Type: Application
    Filed: December 7, 2000
    Publication date: April 12, 2001
    Applicant: ICI Canada, Inc.
    Inventor: Arun Kumar Chattopadhyay