Patents by Inventor Teruaki Ookawa

Teruaki Ookawa 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: 6572951
    Abstract: A printing sheet which prevents setoff while transferring a sufficient quantity of ink and maintains necessary dot uniformity can be obtained by ensuring characteristics that the centerline average roughness showing the larger value is 1.0-3.5 &mgr;m and the ratio of centerline average obtained by dividing the larger value by the smaller value is less than 1.15 where said values are chosen at the point where the difference between the centerline average roughness in a certain direction and the centerline average roughness at right angles to said direction is maximal. Further, the abovementioned quality is further improved by appropriately ensuring that the oil absorbability is more than 4 mg/cm2 and less than 7 mg/cm2 when the contact time between the oil component having a surface tension of 27-30 mN/m at 20° C. and the printing sheet is 5 seconds and/or that the median pore diameter is 1.7-3.5 &mgr;m, in addition to the abovementioned characteristics.
    Type: Grant
    Filed: March 28, 2001
    Date of Patent: June 3, 2003
    Assignee: Nippon Paper Industries Co., Ltd.
    Inventors: Makoto Hasegawa, Noriko Kumazawa, Akinobu Chatani, Nobuo Nakanishi, Ryuta Ono, Hiroki Yamamoto, Teruaki Ookawa, Yasuo Yamamoto
  • Publication number: 20020051865
    Abstract: A printing sheet which prevents setoff while transferring a sufficient quantity of ink and maintains necessary dot uniformity can be obtained by ensuring characteristics that the centerline average roughness showing the larger value is 1.0-3.5 &mgr;m and the ratio of centerline average obtained by dividing the larger value by the smaller value is less than 1.15 where said values are chosen at the point where the difference between the centerline average roughness in a certain direction and the centerline average roughness at right angles to said direction is maximal. Further, the abovementioned quality is further improved by appropriately ensuring that the oil absorbability is more than 4 mg/cm2 and less than 7 mg/cm2 when the contact time between the oil component having a surface tension of 27-30 mN/m at 20° C. and the printing sheet is 5 seconds and/or that the median pore diameter is 1.7-3.5 &mgr;m, in addition to the abovementioned characteristics.
    Type: Application
    Filed: March 28, 2001
    Publication date: May 2, 2002
    Inventors: Makoto Hasegawa, Noriko Kumazawa, Akinobu Chatani, Nobuo Nakanishi, Ryuta Ono, Hiroki Yamamoto, Teruaki Ookawa, Yasuo Yamamoto