Patents by Inventor Shinji Yoshinaka

Shinji Yoshinaka 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).

  • Fluoran compounds and color forming recording materials using same
    Patent number: 4954631
    Abstract: Fluoran compounds are disclosed of formula (I) ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently represent hydrogen, halogen, lower alkoxy, C.sub.1 -C.sub.9 -alkyl, C.sub.5 or C.sub.6 -cycloalkyl, benzyl or phenyl, said benzyl or phenyl being optionally substituted by halogen, lower alkyl or lower alkoxy, and further R.sub.1 and R.sub.2 as well as R.sub.3 and R.sub.4 taken together with Ring A, may form a naphthalene ring optionally substituted by halogen, lower alkyl or lower alkoxy, R.sub.5, R.sub.6 and R.sub.7 independently represent halogen, lower alkyl or lower alkoxy, B.sub.1 and B.sub.2 independently represent hydrogen, C.sub.1 -C.sub.8 -alkyl, benzyl or phenyl, said benzyl or phenyl being optionally substituted by halogen, lower alkyl, lower alkoxy, or alkyl-substituted, X represents hydrogen atom or --NR.sub.8 R.sub.9 wherein R.sub.8 and R.sub.9 independently represent hydrogen, C.sub.1 -C.sub.8 -alkyl, C.sub.5 or C.sub.
    Type: Grant
    Filed: February 2, 1989
    Date of Patent: September 4, 1990
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Takeo Obitsu, Yutaka Ohnishi, Shinji Yoshinaka, Minoru Koguchi, Mitsuhiro Yanagita, Nobuyuki Hirai
  • Fluoran compounds and color forming recording materials using same
    Patent number: 4826806
    Abstract: Fluoran compounds are disclosed of formula (I) ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently represent hydrogen, halogen, lower alkoxy, C.sub.1 -C.sub.9 -alkyl, C.sub.5 or C.sub.6 -cycloalkyl, benzyl or phenyl, said benzyl or phenyl being optionally substituted by halogen, lower alkyl or lower alkoxy, and further R.sub.1 and R.sub.2 as well as R.sub.3 and R.sub.4 taken together with Ring A, may form a naphthalene ring optionally substituted by halogen, lower alkyl or lower alkoxy, R.sub.5, R.sub.6 and R.sub.7 independently represent halogen, lower alkyl or lower alkoxy, B.sub.1 and B.sub.2 independently represent hydrogen, C.sub.1 -C.sub.8 -alkyl, benzyl or phenyl, said benzyl or phenyl being optionally substituted by halogen, lower alkyl, lower alkoxy, or alkyl-substituted amino, X represents hydrogen atom or --NR.sub.8 R.sub.9 wherein R.sub.8 and R.sub.9 independently represent hydrogen, C.sub.1 -C.sub.8 -alkyl, C.sub.5 or C.sub.
    Type: Grant
    Filed: July 29, 1987
    Date of Patent: May 2, 1989
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Takeo Obitsu, Yutaka Ohnishi, Shinji Yoshinaka, Minoru Koguchi, Mitsuhiro Yanagita, Nobuyuki Hirai
  • Spirobenzanthracene phthalide compounds, processes for preparing same and color forming recording materials containing said compounds
    Patent number: 4794069
    Abstract: Spirobenzanthracene phthalide compounds are disclosed of the formula (I) ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 independently represent C.sub.1 -C.sub.8 alkyl optionally substituted by C.sub.1 -C.sub.5 alkoxy; C.sub.5 or C.sub.6 cycloalkyl; or aralkyl or aryl optionally substituted by C.sub.1 -C.sub.5 alkyl or C.sub.1 -C.sub.5 alkoxy, and R.sup.1 and R.sup.2, R.sup.3 and R.sup.4, and R.sup.5 and R.sup.6 taken together with the nitrogen atom to which they are attached, may form pyrrolidino, piperidino or morpholino ring, and R.sup.7, R.sup.8, R.sup.9 and R.sup.10 independently represent hydrogen, C.sub.1 -C.sub.5 alkyl, C.sub.1 -C.sub.5 alkoxy or trifluoromethyl. The compounds are used, together with a developer, in color for materials such as pressure-sensitive copying papers, heat-sensitive recording papers and the like.
    Type: Grant
    Filed: July 14, 1987
    Date of Patent: December 27, 1988
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Yutaka Ohnishi, Shinji Yoshinaka, Toshiyuki Tanaka, Minoru Koguchi, Takeo Obitsu
  • Addition compound of fluoran compounds and ketone
    Patent number: 4695640
    Abstract: Addition compound of fluoran compound and ketone useful as color former for heat or pressure-sensitive color-developable recording material.
    Type: Grant
    Filed: October 21, 1985
    Date of Patent: September 22, 1987
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Masakichi Yahagi, Tetsuo Igaki, Shinji Yoshinaka, Kimiaki Kinoshita, Morikuni Saito, Toshiyuki Yamashita, Morio Nanbu
  • 4-hydroxy-4'-isopropoxydiphenylsulfone and its use for color-developable recording material
    Patent number: 4616239
    Abstract: 4-Hydroxy-4'-isopropoxydiphenylsulfone useful as color developer for heat-sensitive color-developable recording material.
    Type: Grant
    Filed: September 16, 1985
    Date of Patent: October 7, 1986
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Masakichi Yahagi, Tetsuo Igaki, Shinji Yoshinaka, Kosaku Morita, Kimiaki Kinoshita, Masashi Enokiya, Akio Kaneko, Toshiyuki Yamashita
  • 4-Hydroxy-4'-isopropoxydiphenylsulfone and its use for color-developable recording material
    Patent number: 4568766
    Abstract: 4-Hydroxy-4'-isopropoxydiphenylsulfone useful as color developer for heat-sensitive color-developable recording material.
    Type: Grant
    Filed: June 25, 1984
    Date of Patent: February 4, 1986
    Assignee: Nippon Soda Company Limited
    Inventors: Masakichi Yahagi, Tetsuo Igaki, Shinji Yoshinaka, Kosaku Morita, Kimiaki Kinoshita, Masashi Enokiya, Akio Kaneko, Toshiyuki Yamashita