Patents by Inventor Raman Ambady

Raman Ambady 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 recycling bleach plant filtrate
    Patent number: 5938892
    Abstract: A process for bleaching wood pulp is provided comprising subjecting the wood pulp, after brown stock washing, to an oxygen delignification stage, a washing sequence, a first chlorine dioxide bleaching stage, an oxidative extraction stage, at least one final chlorine dioxide bleaching stage and then recycling the filtrate from the oxidative extraction stage countercurrently through the bleaching plant and brown stock washing. Additionally, and quite beneficially, the filtrate from the first chlorine dioxide bleaching stage is also recycled countercurrently through the brown stock washing thereby significantly reducing the environmental impact associated with the manufacture of bleach wood pulp.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: August 17, 1999
    Assignee: Champion International Corporation
    Inventors: Gerald E. Maples, Raman Ambady
  • Process for manufacturing bleached pulp with reduced chloride production
    Patent number: 5645687
    Abstract: A process for bleaching wood pulp is provided comprising subjecting the wood pulp, after brown stock washing, to an oxygen delignification stage, a washing sequence, a first chlorine dioxide or ozone bleaching stage, an oxidative extraction stage, an ozone activation stage followed by a chlorine dioxide bleaching stage in the absence of an intermediate washing stage.
    Type: Grant
    Filed: July 10, 1995
    Date of Patent: July 8, 1997
    Assignee: Champion International Corporation
    Inventors: Raman Ambady, Dale E. Nutter, Jr., Dewey W. Barnes
  • Process for recycling bleach plant filtrate
    Patent number: 5352332
    Abstract: A process for bleaching wood pulp is provided comprising subjecting the wood pulp, after brown stock washing, to an oxygen delignification stage, a washing sequence, a first chlorine dioxide bleaching stage, an oxidative extraction stage, at least one final chlorine dioxide bleaching stage and then recycling the filtrate from the oxidative extraction stage countercurrently through the bleaching plant and brown stock washing. Additionally, and quite beneficially, the filtrate from the first chlorine dioxide bleaching stage is also recycled countercurrently through the brown stock washing thereby significantly reducing the environmental impact associated with the manufacture of bleach wood pulp.
    Type: Grant
    Filed: September 14, 1992
    Date of Patent: October 4, 1994
    Inventors: Gerald E. Maples, Raman Ambady
  • Process for bleaching wood pulp with hydrogen peroxide
    Patent number: 4402788
    Abstract: In the bleaching of wood pulp using the conventional CEH sequence with subsequent oxidation stages, the third stage (H) is replaced by peroxide oxidation (P) to a brightness level of 35-50 GE. Final brightness levels of 70-88 GE are attained using no greater amounts of chemicals in the subsequent stages than are required in the conventional CEHDH process. The temperature in the P stage is between 120.degree. and 170.degree. F.
    Type: Grant
    Filed: April 26, 1982
    Date of Patent: September 6, 1983
    Assignee: Champion International Corporation
    Inventors: George Paulose, Raman Ambady, James R. Kidd, Hector Ferguson