Patents by Inventor Narendra Srivatsa

Narendra Srivatsa 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).

  • Patent number: 6221798
    Abstract: The specification discloses a method for laminating a synthetic film or sheet to a fibrous web. According to the method, a heat-softenable material is combined as a sheet, film, spray or powder with a continuous fibrous web in interfacial contact with fibers of the fibrous web to form a composite. The composite is then continuously conducted through an extended nip dryer where heat and pressure are applied to the composite to effect a substantial reduction in moisture content of the composite while plasticizing the heat-softenable material so that at least a mechanical bond is formed between the material and the fibers of the web characterized by an intermingling of the fibers and the heat-softenable material.
    Type: Grant
    Filed: July 24, 1997
    Date of Patent: April 24, 2001
    Assignee: International Paper Company
    Inventors: Anant D. Mahale, Xiang Yu, George Karles, Narendra Srivatsa
  • Patent number: 5234543
    Abstract: Deinking of printed paper is accomplished by repulping printed wastepaper in an aqueous medium containing a deinking chemical. The presence of the deinking chemical causes initial agglomeration of ink particles to produce an ink pulp medium. Agglomerated ink particles are removed from the ink pulp medium by size and density separation procedures to separate coarse ink and produce a fine ink particle stream. The fine ink particle stream is recirculated to cause additional agglomeration of ink particles. The reagglomerated ink particles are removed from the fine ink particle stream by size and density separation procedures to produce a substantially ink free pulp medium. The invention provides agglomeration processes with high ink removal from printed paper.
    Type: Grant
    Filed: October 3, 1991
    Date of Patent: August 10, 1993
    Assignee: International Paper Company
    Inventors: Larry D. Markham, Narendra Srivatsa