Patents by Inventor Kazuo Terauchi
Kazuo Terauchi 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).
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Publication number: 20100159380Abstract: A two-component developer containing a cyan toner and a magnetic carrier, wherein the cyan toner has the characteristics: (i) when the concentration of the cyan toner in a solution of the cyan toner in chloroform is represented by Cc (mg/ml) and the absorbance of the solution at a wavelength of 712 nm is represented by A712, a relationship between Cc and A712 satisfies the relationship of 2.00<A712/Cc<8.15; (ii) the lightness L* and chroma C* of the cyan toner determined in a powder state satisfy the relationships of 25.0?L*?40.0 and 50.0?C*?60.0; and (iii) the absolute value for the triboelectric charge quantity of the cyan toner measured by a two-component method using the cyan toner and the magnetic carrier is 50 mC/kg or more and 120 mC/kg or less.Type: ApplicationFiled: March 3, 2010Publication date: June 24, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Koh Ishigami, Kazuo Terauchi, Noriyoshi Umeda, Tetsuya Ida, Naoki Okamoto, Yojiro Hotta, Yoshinobu Baba, Takayuki Itakura, Takeshi Yamamoto, Manami Haraguchi, Kenta Kubo
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Patent number: 7629100Abstract: An object of the present invention is to provide a toner which: is excellent in fixing ability such as low-temperature fixability, hot offset property, and separability even in a fixing system excellent in quick start property and energy saving property; has high gloss; and is excellent in development stability and transferability irrespective of environments.Type: GrantFiled: August 20, 2007Date of Patent: December 8, 2009Assignee: Canon Kabushiki KaishaInventors: Naoki Okamoto, Tetsuya Ida, Koh Ishigami, Kazuo Terauchi, Yojiro Hotta, Noriyoshi Umeda, Yoshinobu Baba, Takayuki Itakura
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Publication number: 20090123856Abstract: Provided is a developer for replenishment capable of forming a high-quality image even upon duration. The developer for replenishment includes at least a toner and a magnetic carrier, and in the developer for replenishment, 1 part by mass of the magnetic carrier is blended with 2 to 50 parts by mass of the toner, and the magnetic carrier contains a ferrite core and a resin component, has a true specific gravity of 2.5 to 4.2 g/cm3, has a 50% particle diameter on a volume basis (D50) of 15 to 70 ?m, and has an average circularity of 0.850 to 0.950, the average circularity having a coefficient of variation of 1.0 to 10.0%.Type: ApplicationFiled: December 5, 2006Publication date: May 14, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Yojiro Hotta, Kazuo Terauchi, Kunihiko Nakamura, Hiroyuki Fujikawa, Yoshinobu Baba, Takayuki Itakura, Hirohide Tanikawa
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Publication number: 20090047592Abstract: An object of the present invention is to provide a toner which: is excellent in fixing ability such as low-temperature fixability, hot offset property, and separability even in a fixing system excellent in quick start property and energy saving property; has high gloss; and is excellent in development stability and transferability irrespective of environments.Type: ApplicationFiled: August 20, 2007Publication date: February 19, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Naoki Okamoto, Tetsuya Ida, Koh Ishigami, Kazuo Terauchi, Yojiro Hotta, Noriyoshi Umeda, Yoshinobu Baba, Takayuki Itakura
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Publication number: 20080286668Abstract: An object of the present invention is to provide a two-component developer which can achieve a high-definition image with a smaller toner laid-on level than a conventional one, provides a color gamut comparable to that of printing, can respond to an increase in printing speed, and allows an image with a stable tinge to be formed even in long-term use. The object can be achieved by a two-component developer containing a cyan toner and a magnetic carrier, the two-component developer being characterized in that the cyan toner has the following characteristics: (i) when the concentration of the cyan toner in a solution of the cyan toner in chloroform is represented by Cc (mg/ml) and the absorbance of the solution at a wavelength of 712 nm is represented by A712, a relationship between Cc and A712 satisfies the relationship of 2.00<A712/Cc<8.15; (ii) the lightness L* and chroma C* of the cyan toner determined in a powder state satisfy the relationships of 25.0?L*?40.0 and 50.0?C*?60.Type: ApplicationFiled: July 29, 2008Publication date: November 20, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Koh Ishigami, Kazuo Terauchi, Noriyoshi Umeda, Tetsuya Ida, Naoki Okamoto, Yojiro Hotta, Yoshinobu Baba, Takayuki Itakura, Takeshi Yamamoto, Manami Haraguchi, Kenta Kubo
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Patent number: 7244539Abstract: A magnetic carrier includes a magnetic material-dispersed resin core containing at least a magnetic material and a binder resin. The surface of the magnetic material-dispersed resin core is coated with a coating material containing at least a fluorine resin and 1 to 40 parts by weight of fine particles based on 100 parts by weight of the fluorine resin. The coating material is in an amount of 0.3 to 4.0 parts by weight based on 100 parts by weight of the magnetic material-dispersed resin core. The magnetic carrier has a contact angle of 95 to 125°. A two-component developer is also provided which makes use of the magnetic carrier.Type: GrantFiled: April 29, 2004Date of Patent: July 17, 2007Assignee: Canon Kabushiki KaishaInventors: Yoshinobu Baba, Ryoichi Fujita, Takaaki Kaya, Kazuo Terauchi
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Patent number: 7144668Abstract: The present invention provides a toner: comprising a binder resin comprising a polyester unit, a colorant, a releasing agent, and inorganic fine particles; has a weight average particle diameter of 3.0–6.5 ?m; has an average circularity of particles in the toner each having a circle-equivalent diameter of 2 ?m or more of 0.920–0.945; has a BET specific surface area of 2.1–3.5 m2/g; and has a permeability of light of a wavelength of 600 nm in a liquid having dispersed the toner in a 45 vol % methanol aq. of 30–80%. The present invention also provides a two-component developer: comprising the toner and a magnetic carrier comprising magnetic core particles coated by a coating layer; and has a number average particle diameter of 15–80 ?m. Using the toner and the two-component developer enables a high-quality image to be formed at a high speed even in an oilless fixing system.Type: GrantFiled: March 5, 2004Date of Patent: December 5, 2006Assignee: Canon Kabushiki KaishaInventors: Yoshinobu Baba, Yuko Sato, Ryoichi Fujita, Takaaki Kotaki, Nobuyoshi Sugahara, Kazuo Terauchi, Takayuki Itakura
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Patent number: 7138213Abstract: The present invention provides a cyan toner including: one or plural heat-absorption peaks in a temperature range of 30 to 200° C. in a heat-absorption curve obtained by using a differential scanning calorimeter; a maximal value of a maximum heat-absorption peak temperature in the range of 65 to 150° C.; and a reflectance of 45 to 80% at a wavelength of 500 nm, a reflectance of 5 to 30% at a wavelength of 600 nm, and a brightness L* of 45 to 75, when measured in a powder form by spectroscopic analysis. The present invention thus provides a cyan toner capable of forming an image with reduced graininess and roughness from a low-density region to a high-density region and ensured a sufficient fixing temperature region, and a method for forming an image using the cyan toner.Type: GrantFiled: March 5, 2004Date of Patent: November 21, 2006Assignee: Canon Kabushiki KaishaInventors: Takayuki Itakura, Yoshinobu Baba, Yuko Sato, Nobuyoshi Sugahara, Kazuo Terauchi, Takaaki Kotaki, Hirohide Tanikawa
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Publication number: 20040253529Abstract: A magnetic carrier includes a magnetic material-dispersed resin core containing at least a magnetic material and a binder resin. The surface of the magnetic material-dispersed resin core is coated with a coating material containing at least a fluorine resin and 1 to 40 parts by weight of fine particles based on 100 parts by weight of the fluorine resin. The coating material is in an amount of 0.3 to 4.0 parts by weight based on 100 parts by weight of the magnetic material-dispersed resin core. The magnetic carrier has a contact angle of 95 to 125°. A two-component developer is also provided which makes use of the magnetic carrier.Type: ApplicationFiled: April 29, 2004Publication date: December 16, 2004Applicant: CANON KABUSHIKI KAISHAInventors: Yoshinobu Baba, Ryoichi Fujita, Takaaki Kaya, Kazuo Terauchi
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Publication number: 20040209178Abstract: The present invention provides a cyan toner including: one or plural heat-absorption peaks in a temperature range of 30 to 200° C. in a heat-absorption curve obtained by using a differential scanning calorimeter; a maximal value of a maximum heat-absorption peak temperature in the range of 65 to 150° C.; and a reflectance of 45 to 80% at a wavelength of 500 nm, a reflectance of 5 to 30% at a wavelength of 600 nm, and a brightness L* of 45 to 75, when measured in a powder form by spectroscopic analysis. The present invention thus provides a cyan toner capable of forming an image with reduced graininess and roughness from a low-density region to a high-density region and ensured a sufficient fixing temperature region, and a method for forming an image using the cyan toner.Type: ApplicationFiled: March 5, 2004Publication date: October 21, 2004Inventors: Takayuki Itakura, Yoshinobu Baba, Yuko Sato, Nobuyoshi Sugahara, Kazuo Terauchi, Takaaki Kotaki, Hirohide Tanikawa
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Publication number: 20040175643Abstract: The present invention provides a toner: comprising a binder resin comprising a polyester unit, a colorant, a releasing agent, and inorganic fine particles; has a weight average particle diameter of 3.0-6.5 &mgr;m; has an average circularity of particles in the toner each having a circle-equivalent diameter of 2 &mgr;m or more of 0.920-0.945; has a BET specific surface area of 2.1-3.5 m2/g; and has a permeability of light of a wavelength of 600 nm in a liquid having dispersed the toner in a 45 vol % methanol aq. of 30-80%. The present invention also provides a two-component developer: comprising the toner and a magnetic carrier comprising magnetic core particles coated by a coating layer; and has a number average particle diameter of 15-80 &mgr;m. Using the toner and the two-component developer enables a high-quality image to be formed at a high speed even in an oilless fixing system.Type: ApplicationFiled: March 5, 2004Publication date: September 9, 2004Inventors: Yoshinobu Baba, Yuko Sato, Ryoichi Fujita, Takaaki Kotaki, Nobuyoshi Sugahara, Kazuo Terauchi, Takayuki Itakura
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Patent number: 4387659Abstract: A device for engaging and disengaging a line comprising a pair of pivotal arms turnable to an upright position and to a horizontal position and supported at a location close to a line engaging bitt opposed to and a distance away from a line guiding member, a pressing traverse arm extending between the free ends of the pivotal arms, a disengaging traverse arm extending between intermediate portions of the pivotal arms for disengaging the line from the bitt, apparatus for turning the pivotal arms to the upright position and to the horizontal position, and a pressing bed positioned to oppose the pressing traverse arm when the pivotal arms are turned to the horizontal position, the disengaging traverse arm being positionable above the bitt when the pivotal arms are in the upright position, the traverse arms and the pivotal arms defining a space for inserting the line therethrough. The line can be engaged with and disengaged from the bitt or bollard easily and properly.Type: GrantFiled: June 24, 1981Date of Patent: June 14, 1983Assignee: Hitachi Shipbuilding & Engineering Co., Ltd.Inventors: Kazuo Terauchi, Masatoshi Fukata