Patents by Inventor Katsumi Murofushi

Katsumi Murofushi 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: 5846682
    Abstract: A light decolorizable recording material comprising a colored dye having absorptions in the visible light region and a boron compound represented by the general formula (1), ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each independently represents an alkyl, aryl, allyl, aralkyl, alkenyl, alkynyl, silyl, heterocyclic, substituted alkyl, substituted aryl, substituted allyl, substituted aralkyl, substituted alkenyl, substituted alkynyl or substituted silyl group, and Z.sup.+ represents a quaternary ammonium, quaternary pyridinium, quaternary quinolinium or phosphonium cation.
    Type: Grant
    Filed: February 13, 1997
    Date of Patent: December 8, 1998
    Assignee: Showa Denko K.K.
    Inventors: Katsumi Murofushi, Yoshikazu Hosada
  • Patent number: 5814427
    Abstract: What is disclosed a decolorizable toner of which main components are a visible ray-near infrared ray-absorbing dye, a decolorizing agent and a resin binder, characterized in that a resin binder A containing the visible ray-near infrared ray-absorbing dye is dispersed in a resin binder B and that the decolorizing agent is blended with at least one of the resin binder A and the resin binder B, and a process for preparing the same. The visible ray-near infrared ray-decolorizable toner of the present invention can be speedily decolorized by irradiating with visible rays to near infrared rays. Also, according to the process of the present invention, it is easy to adjust its electrically charged amount by a material having electrification property, and there is obtained a visible ray-near infrared ray-decolorizable toner which is hardly faded during the kneading in the production of the toner.
    Type: Grant
    Filed: July 3, 1995
    Date of Patent: September 29, 1998
    Assignees: Bando Chemical Industries, Ltd., Showa Denko K.K.
    Inventors: Katsumi Murofushi, Yoshikazu Hosoda, Akira Yamauchi, Yuki Abe, Harushi Nagami, Kiyotaka Yamaguchi, Takayuki Yoshida, Mitsuhiro Uchino
  • Patent number: 5607803
    Abstract: The present invention discloses a decolorizable toner wherein a cationic dye having absorbance from the visible region to the near infrared region is contained in a binder resin together with a decolorant and anti-discoloration agent. In addition, the present invention also discloses a production process of a decolorizable toner that contains a step wherein cationic dye having absorbance from the visible region to the near infrared region, decolorant, binder resin and anti-discoloration agent are uniformly dissolved or dispersed in an organic solvent to prepare a mixed solution; a step wherein the solvent is removed from this mixed solution followed by drying; and, a step wherein the resulting dried mixture is pulverized to produce a toner.
    Type: Grant
    Filed: December 9, 1994
    Date of Patent: March 4, 1997
    Assignees: Showa Denko K.K., Bando Chemical Industries, Ltd.
    Inventors: Katsumi Murofushi, Yoshikazu Hosoda, Toshiya Kawasaki, Yuki Abe, Kiyotaka Yamaguchi, Takayuki Yoshida
  • Patent number: 5572311
    Abstract: A sheet of paper, plastic or the like on which an image has been formed using a toner that is photochemically decolorizable by absorption of near infrared rays is illuminated with near infrared rays under the state wherein the image is heated to a temperature equal to or higher than the glass-transition temperature of a binding resin of the toner. The color of the toner can thereby be easily and rapidly eliminated. This enables the reuse of the sheet to be realized easily and at a low cost.
    Type: Grant
    Filed: September 9, 1994
    Date of Patent: November 5, 1996
    Assignees: Bando Chemical Industries, Ltd., Showa Denko Kabushiki Kaisha
    Inventors: Yuki Abe, Rikuzou Kouzuki, Masakazu Okamoto, Yasunori Mikata, Masatsugu Tabata, Shigeki Inoue, Sadao Tanimoto, Yoshihiro Uchimoto, Katsumi Murofushi, Yoshikazu Hosoda
  • Patent number: 5449583
    Abstract: A decolorizable toner including a resin binder, a near infrared ray-absorbing dye, a decolorizing agent and a light fastness stabilizer, and a process for preparing the decolorizable toner, which includes the steps of mixing the near infrared ray-absorbing dye and the light fastness stabilizer with the resin binder, and then mixing the decolorizing agent therewith. The decolorizable toner has excellent light stability during its production or storage and excellent decolorizing property.
    Type: Grant
    Filed: September 6, 1994
    Date of Patent: September 12, 1995
    Assignees: Showa Denko, K.K., Bando Chemical Industries, Ltd.
    Inventors: Katsumi Murofushi, Yoshikazu Hosoda, Yuki Abe, Kiyotaka Yamaguchi, Takayuki Yoshida
  • Patent number: 5405726
    Abstract: A sheet of paper, plastic or the like on which an image has been formed using a toner that is photochemically decolorizable by absorption of near infrared rays is illuminated with near infrared rays under the state wherein the image is heated to a temperature equal to or higher than the glass-transition temperature of a binding resin of the toner. The color of the toner can thereby be easily and rapidly eliminated. This enables the reuse of the sheet to be realized easily and at a low cost.
    Type: Grant
    Filed: November 10, 1992
    Date of Patent: April 11, 1995
    Assignees: Bando Chemical Industries. Ltd., Showa Denko Kabushiki Kaisha
    Inventors: Yuki Abe, Rikuzou Kouzuki, Masakazu Okamoto, Yasunori Mikata, Masatsugu Tabata, Shigeki Inoue, Sadao Tanimoto, Yoshihiro Uchimoto, Katsumi Murofushi, Yoshikazu Hosoda
  • Patent number: 5362592
    Abstract: A decolorizable toner including a resin binder, a near infrared ray-absorbing dye, a decolorizing agent and a light fastness stabilizer, and a process for preparing the decolorizable toner, which includes the steps of mixing the near infrared ray-absorbing dye and the light fastness stabilizer with the resin binder, and then mixing the decolorizing agent therewith. The decolorizable toner has excellent light stability during its production or storage and excellent decolorizing property.
    Type: Grant
    Filed: November 13, 1992
    Date of Patent: November 8, 1994
    Assignees: Showa Denko K.K., Bando Chemical Industries, Ltd.
    Inventors: Katsumi Murofushi, Yoshikazu Hosoda, Toshio Kaji, Yuki Abe, Kiyotaka Yamaguchi, Takayuki Yoshida, Jiro Yamashiro, Toshio Arai, Takayuki Nagase, Harushi Nagami
  • Patent number: 5166041
    Abstract: The present invention relates to a near infrared ray-decolorizable recording material comprising a near infrared ray-absorbing cationic dye-borate anion complex having the formula (I): ##STR1## wherein D.sup.+ represents a cationic dye having absorptions in the near infrared region; R.sub.1, R.sub.2, R.sub.3, and R.sub.4 independently represent an alkyl, aryl, alkaryl, allyl, aralkyl, alkenyl, alkynyl, silyl, alicyclic, or saturated or unsaturated heterocyclic group, substituted alkyl, substituted aryl, substituted alkaryl, substituted allyl, substituted aralkyl, substituted alkenyl, substituted alkynyl, or substituted silyl, with the proviso that at least one of R.sub.1, R.sub.2, R.sub.3, and R.sub.4 represents an alkyl group having 1 to 8 carbon atoms.
    Type: Grant
    Filed: July 22, 1991
    Date of Patent: November 24, 1992
    Assignee: Showa Denko K.K.
    Inventors: Katsumi Murofushi, Yoshikazu Hosoda, Yoke Ai Gan, Kunio Kondo
  • Patent number: 4833256
    Abstract: A fluoran derivative useful for a heat-sensitive recording material, having the following general formula I; ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, stand for an alkyl group having 1 to 9 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a phenyl group or a phenyl group substituted by an alkyl group having 1 to 4 carbon atoms, and R.sub.3 and R.sub.4, which may be the same or different, stand for an alkyl group having 1 to 6 carbon atoms or a phenyl group or R.sub.3 and R.sub.4 may form a 5- to 8-membered cycloalkane together with the carbon atom to which they are bonded.
    Type: Grant
    Filed: October 8, 1986
    Date of Patent: May 23, 1989
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Teijiro Kitao, Tetsuhiko Yamaguchi, Katsumi Murofushi, Masato Futagami, Nobuyuki Nagato, Kunio Imamura