Patents by Inventor Subrao S. Kulkarni

Subrao S. Kulkarni 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).

  • 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