Patents by Inventor Mohan D. Karve

Mohan D. Karve 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).

  • Papermaking pulp and flocculant comprising acidic acqueous alumina sol
    Patent number: 6712933
    Abstract: Methods of making paper or paperboard are described. According to one of the methods, an acidic aqueous alumina sol is introduced to a papermaking pulp to form a treated pulp having improved retention properties. The acidic aqueous alumina sol preferably has a pH of from about 3 to about 6. The sol preferably contains elongate secondary particles which are elongated from about 50 nm to about 300 nm in only one plane and formed by edge-to-edge coagulation of rectangular plate like primary particles having a length on one side of from about 10 nm to about 30 nm when observed through an electron microscope. The pulp may also be treated with at least one coagulant, at least one flocculant, at least one cationic starch, at least one cellulytic enzyme, at least one biocide, and/or other conventional papermaking pulp additives. The resulting pulp is formed into a sheet of pulp and then drained to form a paper or paperboard.
    Type: Grant
    Filed: May 17, 2001
    Date of Patent: March 30, 2004
    Assignee: Buckman Laboratories International, Inc.
    Inventors: Mohan D. Karve, Rosa M. Covarrubias, Gerald M. Dykstra, Saleem Mirza
  • Papermaking pulp and flocculant comprising acidic aqueous alumina sol
    Publication number: 20020033245
    Abstract: Methods of making paper or paperboard are described. According to one of the methods, an acidic aqueous alumina sol is introduced to a papermaking pulp to form a treated pulp having improved retention properties. The acidic aqueous alumina sol preferably has a pH of from about 3 to about 6. The sol preferably contains elongate secondary particles which are elongated from about 50 nm to about 300 nm in only one plane and formed by edge-to-edge coagulation of rectangular plate like primary particles having a length on one side of from about 10 nm to about 30 nm when observed through an electron microscope. The pulp may also be treated with at least one coagulant, at least one flocculent, at least one cationic starch, at least one cellulytic enzyme, at least one biocide, and/or other conventional papermaking pulp additives. The resulting pulp is formed into a sheet of pulp and then drained to form a paper or paperboard.
    Type: Application
    Filed: May 17, 2001
    Publication date: March 21, 2002
    Inventors: Mohan D. Karve, Rosa M. Covarrubias, Gerald M. Dykstra, Saleem Mirza
  • TCMTB on a solid carrier in powdered form, method of manufacture and method of use
    Patent number: 5413795
    Abstract: A composition comprising TCMTB and a solid, preferably inert, carrier. The composition is in a powdered form and can be effective for preventing the growth of microorganisms. A method for preparing this composition comprises mixing the TCMTB with the carrier.
    Type: Grant
    Filed: August 14, 1992
    Date of Patent: May 9, 1995
    Assignee: Buckman Laboratories, International, Inc.
    Inventors: James C. Lee, Mohan D. Karve