Patents by Inventor Narendta R. Srivatsa

Narendta R. 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).

  • Method for removing ink from printed paper using agglomerating agent, followed by addition of talc
    Patent number: 5340439
    Abstract: A method for removing ink from printed paper to be recycled by pulping the printed paper to be recycled with water to produce a paper pulp slurry with a consistency of between about 1% and about 20%, adjusting the pH of the paper pulp slurry to between about 6 and about 13, maintaining the paper pulp slurry at a temperature of between about 30.degree. C. and about 100.degree. C., adding an agglomerating agent to the paper pulp slurry, pulping the paper pulp slurry for a period of between about 5 min. and about 90 min., such that the ink particles agglomerate, thereafter, adding between about 0.2 wt. % and about 2.0 wt. %, based on the dry weight of the pulp, of talc to the paper pulp slurry, and thereafter, removing the agglomerated ink particles from the paper pulp slurry.
    Type: Grant
    Filed: August 6, 1992
    Date of Patent: August 23, 1994
    Assignee: International Paper Company
    Inventors: Larry D. Markham, Narendta R. Srivatsa