Patents Assigned to The Atul Products Limited
  • Water soluble direct black polyazo dyestuffs mixture
    Patent number: 4816034
    Abstract: A water soluble direct black polyazo dyestuffs mixture comprising trisazo dyestuffs, polyazo dyestuffs and disazo dyestuff.
    Type: Grant
    Filed: August 12, 1986
    Date of Patent: March 28, 1989
    Assignee: The Atul Products Limited
    Inventors: Girish I. Bhatt, Subrao S. Kulkarni, Chandrashekhar B. Upasani, Mukundbhai Bhatt
  • Process for the preparation of a water soluble direct green polyazo dyestuffs mixture in situ and water soluble direct green polyazo dyestuffs mixture obtained thereby
    Patent number: 4699628
    Abstract: A process for the preparation of a water soluble direct green polyazo dyestuffs mixture in situ comprising phosgenation of a mordant yellow dye and an acid green dye using phosgene gas in an aqueous alkaline medium at a temperature between 50.degree. C. to 80.degree. C. and isolating or recovering the dyestuffs mixture from the phosgenation reaction mass and water soluble direct green polyazo dyestuffs mixture obtained thereby.
    Type: Grant
    Filed: August 12, 1986
    Date of Patent: October 13, 1987
    Assignee: The Atul Products Limited
    Inventors: Nagajibhai T. Patel, Subrao S. Kulkarni, Garish I. Bhatt