Patents Examined by J. M. Redd
  • Suppression of pressure water absorption of lightweight aggregate by aqueous dispersion therein of anionic polymers
    Patent number: 4956403
    Abstract: A pressure water absorption inhibitor for lightweight aggregates which comprises an aqueous dispersion of a polymeric substance having a viscosity which permits the aqueous dispersion to enter the fine pores in the surface layer of a lightweight aggregate and which dispersion is capable of being thickened to a viscosity of not less than 50 times the viscosity before thickening by elevation of the pH.
    Type: Grant
    Filed: November 2, 1987
    Date of Patent: September 11, 1990
    Assignees: Takenaka Komuten Co., Ltd., Sanyo Chemical Industries, Ltd.
    Inventors: Toshio Yonezawa, Takashi Iwashimizu, Yasuhiko Yoshioka, Koichi Ito, Kunio Sakaue, Tetsuo Nakase