Patents by Inventor Masakichi Yahagi

Masakichi Yahagi 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).

  • Molecular compound of fluoran compound and ketone
    Patent number: 4727162
    Abstract: A molecular compound of a fluoran compound and a ketone useful as a color former for heat or pressure-sensitive color-developable recording material.
    Type: Grant
    Filed: November 25, 1986
    Date of Patent: February 23, 1988
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Masakichi Yahagi, Tetsuo Igaki
  • 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
  • Chromogenic fluoran derivatives
    Patent number: 4677203
    Abstract: Certain 3-piperidino fluoran derivatives useful as color recording materials are disclosed.
    Type: Grant
    Filed: June 14, 1983
    Date of Patent: June 30, 1987
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Masakichi Yahagi, Shoichi Horiuchi, Takahumi Toyama, Akio Kashiwagi, Teruo Suzuki, Tetsuo Igaki, Kazuyuki Horisawa, Mituhiro Shoji
  • Fluoran compound and color forming record materials using the same
    Patent number: 4668967
    Abstract: 3-N-isobutyl-ethylamino-7-phenylaminofluoran is a new green color former. It is used, together with an acidic substance, in color forming record materials for use in pressure sensitive copying paper, heat-sensitive recording paper and the like.
    Type: Grant
    Filed: May 28, 1986
    Date of Patent: May 26, 1987
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Masakichi Yahagi, Takeo Obitsu, Tetsuo Igaki, Kazuyuki Horisawa, Morio Nanbu, Kimiaki Kinoshita, Sumio Manaka
  • 3-N-isobutylethylamino-6-methyl-7-phenylaminofluoran
    Patent number: 4665199
    Abstract: 3-N-isobutylethylamino-6-methyl-7-phenylamino fluoran of formula (I) ##STR1## is described.
    Type: Grant
    Filed: December 23, 1985
    Date of Patent: May 12, 1987
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Masakichi Yahagi, Tetsuo Igaki, Sinzi Yoshinaka, Kousaku Morita, Morikuni Saito, Kimiaki Kinoshita
  • Chromogenic recording materials
    Patent number: 4642357
    Abstract: A compound of the formula (I) ##STR1## wherein R is methyl or ethyl, useful in chromogenic recording materials, is described.
    Type: Grant
    Filed: May 20, 1986
    Date of Patent: February 10, 1987
    Assignee: Shin Nisso Kako Cp., Ltd.
    Inventors: Masakichi Yahagi, Tetsuo Igaki, Sinzi Yosinaka, Kousaku Morita, Morikuni Saito, Kimiaki Kinoshita
  • 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
  • Chromogenic recording materials
    Patent number: 4613879
    Abstract: This invention relates to chromogenic recording materials comprising as a chromogenic substance 3-N-isobutylethylamino-6-methyl-7-phenylaminofluoran of the following formula (I) ##STR1##
    Type: Grant
    Filed: April 18, 1984
    Date of Patent: September 23, 1986
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Masakichi Yahagi, Tetsuo Igaki, Sinzi Yoshinaka, Kousaku Morita, Morikuni Saito, Kimiaki Kinoshita
  • Chromogenic recording materials
    Patent number: 4590498
    Abstract: Chromogenic recording materials which utilizes a fluoran compound of the formula ##STR1## wherein R is methyl or ethyl, is described.
    Type: Grant
    Filed: February 23, 1984
    Date of Patent: May 20, 1986
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Masakichi Yahagi, Tetsuo Igaki, Sinzi Yosinaka, Kousaku Morita, Morikuni Saito, Kimiaki Kinoshita
  • 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
  • Heat-sensitive color-developing composition
    Patent number: 4503446
    Abstract: Dibenzyl terephthalate and isophthalate are known compounds. The present invention is concerned with the new use of such known compounds. In a color-developing system which comprises the combination of a color-developing dye and an organic acidic substance, a higher fatty acid amide has been used as a sensitizer for such system. Unexpectedly, we have found that dibenzyl terephthalate or isophthalate is specifically useful as a sensitizer in said system.
    Type: Grant
    Filed: December 3, 1982
    Date of Patent: March 5, 1985
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Masakichi Yahagi, Kimiaki Kinoshita, Masashi Enokiya
  • Chromogenic fluoran derivatives and the preparation and use thereof
    Patent number: 4410708
    Abstract: Certain 3-substituted amino-7-substituted fluoran derivatives useful as color recording materials.
    Type: Grant
    Filed: February 3, 1976
    Date of Patent: October 18, 1983
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Masakichi Yahagi, Shoichi Horiuchi, Takahumi Toyama, Akio Kashiwagi, Teruo Suzuki, Tetsuo Igaki, Kazuyuki Horisawa, Mituhiro Shoji
  • Chromogenic fluoran derivatives and the preparation and use thereof
    Patent number: 3959571
    Abstract: A recording material which is suitable as a pressure-sensitive or heat-sensitive copying paper or recording paper by developing a color in contact with an electron-accepting material which comprises certain fluoran derivatives containing piperidino, pyrrolidino, morpholino and cycohexylamino groups.
    Type: Grant
    Filed: May 21, 1974
    Date of Patent: May 25, 1976
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Masakichi Yahagi, Shoichi Horiuchi, Takahumi Toyama, Akio Kashiwagi, Teruo Suzuki, Tetsuo Igaki, Kazuyuki Horisawa, Mituhiro Shoji