Patents by Inventor Mayumi Narushima

Mayumi Narushima 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).

  • Sizing composition and sizing method
    Patent number: 5013775
    Abstract: A novel paper sizing composition comprising a ketene dimer and a hydrophilic vinyl polymer containing an alkylmercaptan having 6-22 carbon atoms. The composition has excellent storage and mechanical stability and sizing effect.
    Type: Grant
    Filed: April 27, 1989
    Date of Patent: May 7, 1991
    Assignee: DIC-Hercules Chemicals, Inc.
    Inventors: Hideo Oikawa, Masatomi Ogawa, Kiyoshi Iwai, Mayumi Narushima
  • Papermaking additive
    Patent number: 4717758
    Abstract: A papermaking additive useful for papermaking in a neutral to alkaline pH region which comprises a water-soluble copolymer comprising (a) 1 to 20 mole % of dimethylaminopropyl (meth)acrylamide or its quaternized product, (b) 0.1 to 12 mole % of itaconic acid or its salt, and (c) 98.9 to 68 mole % of acrylamide, the (b)/(a) mole ratio being from 0.1 to 0.6.
    Type: Grant
    Filed: August 21, 1986
    Date of Patent: January 5, 1988
    Assignee: DIC-Hercules Chemicals, Inc.
    Inventors: Masatomi Ogawa, Mayumi Narushima