Patents by Inventor Junko Yoshikawa
Junko Yoshikawa 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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Patent number: 7190925Abstract: A developer supply container for supplying a developer detachably set in an image forming apparatus, the developer supply container includes a main body for containing the developer; a discharge opening, provided in the main body, for discharging the developer; a plurality of feeding projections, provided projected from a curved inner surface, for feeding the developer in the main body toward the discharge opening with rotation of the main body, wherein each of the projections are linear without twisting.Type: GrantFiled: August 31, 2004Date of Patent: March 13, 2007Assignee: Canon Kabushiki KaishaInventors: Tetsuo Isomura, Yutaka Ban, Yusuke Yamada, Kazuhiko Omata, Junko Yoshikawa, Hironori Minagawa
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Patent number: 7054581Abstract: A developer supply container substantially non-rotatably mountable, with a developing device for developing an electrostatic image with a developer, to a rotatable member provided in an image forming apparatus, the developer supply container being adapted to supply a developer into the developing device therefrom with rotation of the rotatable member, the developer supply container includes a container body for containing the developer; a discharging opening, formed in a peripheral surface of the container body, for permitting downward discharge of the developer; a feeding portion, provided on an inside surface of the container body, for feeding the developer in a feeding direction toward the discharge opening with rotation of the rotatable member; and a developer movement constraining portion, provided adjacent a position opposed to a position of the discharge opening on the inside surface of the container body, independently of said feeding portion, for constraining the developer which is reversed into theType: GrantFiled: March 10, 2004Date of Patent: May 30, 2006Assignee: Canon Kabushiki KaishaInventors: Junko Yoshikawa, Tetsuo Isomura
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Patent number: 6987942Abstract: A toner supplying kit for being detachably set in an image forming apparatus to supply toner thereto, the toner supplying kit includes a toner container for containing toner; a discharge opening, provided in the toner container, for discharging the toner; plural feeding projections, projected inwardly in the toner container, for feeding the toner in the toner container toward the discharge opening with rotation of the toner container, wherein a uniaxial collapse stress of the toner when a vertical stress of 128 g/cm2 is applied thereto is 2.0-8.0 g/cm2.Type: GrantFiled: April 22, 2003Date of Patent: January 17, 2006Assignee: Canon Kabushiki KaishaInventors: Junko Yoshikawa, Yutaka Ban, Tetsuo Isomura, Hironori Minagawa
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Patent number: 6963713Abstract: A developer supply container supplies a developer detachably set in an image forming apparatus. The developer supply container includes a main body for containing the developer; a discharge opening, which is provided in the main body, for discharging the developer; and a plurality of feeding projections, which are disposed so as to project from a curved inner surface of the main body, for feeding the developer in the main body toward the discharge opening with rotation of the main body. Each of the projections is linear without being twisted, wherein adjacent ones of the plurality of feeding projections include portions, which overlap each other as seen in a direction of an axis of rotation of the main body.Type: GrantFiled: April 23, 2003Date of Patent: November 8, 2005Assignee: Canon Kabushiki KaishaInventors: Tetsuo Isomura, Yutaka Ban, Yusuke Yamada, Kazuhiko Omata, Junko Yoshikawa, Hironori Minagawa
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Patent number: 6929894Abstract: A toner is disclosed which is composed of toner particles containing at least a binder resin, a colorant and a wax, and an external additive. The wax has, in its DSC endothermic curve, a maximum endothermic peak at 55° C. to 80° C. within the temperature range from 30° C. to 160° C., the maximum endothermic peak having a half width of from 2° C. to 7° C., and the binder resin is composed chiefly of a polyester resin. The toner has a dynamic elastic modulus from 5×102 to 1×105 dN/m2 at 140° C., and its ratio to a dynamic elastic modulus at 170° C. is from 0.05 to 50, and the toner contains 10 to 20% by weight of THF-insoluble matter A of a binder resin component after 8 hours from the start of extraction and 1 to 10% by weight of THF-insoluble matter B of the binder resin component after 24 hours from the start of extraction, the ratio of A to B, B/A, being from 0.1 to 0.8. Also disclosed is a fixing method making use of this toner.Type: GrantFiled: July 10, 2002Date of Patent: August 16, 2005Assignee: Canon Kabushiki KaishaInventors: Nobuyoshi Sugahara, Masaaki Taya, Junko Yoshikawa, Takayuki Itakura, Yojiro Hotta
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Patent number: 6922540Abstract: A developer supply kit for supplying a developer to an image forming apparatus includes a container for accommodating a developer; an opening provided in the container to permit discharging of the developer; and a feeding member, provided in the container, for feeding the developer by rotation thereof. The feeding member includes a lift portion for lifting the toner in the container, a guiding portion for guiding the toner lifted by the lift portion downwardly toward the opening, and a falling portion for letting the toner lifted by the lifting portion fall without feeding it toward the opening with rotation of the feeding member. The developer has an adhering strength which is not less than 0.60 g/cm2 and less than 3.00 g/cm2 after a vertical pressure of 128.4 g/cm2 is imparted to a layer of the developer.Type: GrantFiled: October 3, 2002Date of Patent: July 26, 2005Assignee: Canon Kabushiki KaishaInventors: Junko Yoshikawa, Yusuke Yamada
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Publication number: 20050025529Abstract: A developer supply container for supplying a developer detachably set in an image forming apparatus, the developer supply container includes a main body for containing the developer; a discharge opening, provided in the main body, for discharging the developer; a plurality of feeding projections, provided projected from a curved inner surface, for feeding the developer in the main body toward the discharge opening with rotation of the main body, wherein each of the projections are linear without twisting.Type: ApplicationFiled: August 31, 2004Publication date: February 3, 2005Applicant: Canon Kabushiki KaishaInventors: Tetsuo Isomura, Yutaka Ban, Yusuke Yamada, Kazuhiko Omata, Junko Yoshikawa, Hironori Minagawa
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Publication number: 20040234297Abstract: A developer supply container substantially non-rotatably mountable, with a developing device, to a rotatable member provided in an image forming apparatus, said developer supply container being adapted to supply a developer into the developing device therefrom with rotation of the rotatable member, said developer supply container includes a container body for containing the developer; a discharging opening, formed in a peripheral surface of said container body, for permitting downward discharge of the developer; a feeding portion, provided in said container body, for feeding the developer in a feeding direction toward said discharge opening with rotation of said rotatable member; and a developer movement constraining portion, provided adjacent a position facing said discharge opening within in said container body, for constraining the developer which is reversed into said container body through said discharge opening when said discharge opening faces upward with rotation of said rotatable member, from movingType: ApplicationFiled: March 10, 2004Publication date: November 25, 2004Applicant: Canon Kabushiki KaishaInventors: Junko Yoshikawa, Tetsuo Isomura
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Publication number: 20040052553Abstract: A developer supply container for supplying a developer detachably set in an image forming apparatus, the developer supply container includes a main body for containing the developer; a discharge opening, provided in the main body, for discharging the developer; a plurality of feeding projections, provided projected from a curved inner surface, for feeding the developer in the main body toward the discharge opening with rotation of the main body, wherein each of the projections are linear without twisting.Type: ApplicationFiled: April 23, 2003Publication date: March 18, 2004Applicant: Canon Kabushiki KaishaInventors: Tetsuo Isomura, Yutaka Ban, Yusuke Yamada, Kazuhiko Omata, Junko Yoshikawa, Hironori Minagawa
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Publication number: 20040033087Abstract: A toner supplying kit for being detachably set in an image forming apparatus to supply toner thereto, said toner supplying kin includes a toner container for containing toner; a discharge opening, provided in said toner container, for discharging the toner; a plurality of feeding projections, projected inwardly in said toner container, for feeding the toner in said toner container toward said discharge opening with rotation of said toner container, wherein a uniaxial collapse stress of the toner when a vertical stress of 128 g/cm2 is applied thereto is 2.0-8.0 g/cm2.Type: ApplicationFiled: April 22, 2003Publication date: February 19, 2004Applicant: CANON KABUSHIKI KAISHAInventors: Junko Yoshikawa, Yutaka Ban, Tetsuo Isomura, Hironori Minagawa
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Publication number: 20040009420Abstract: A toner is disclosed which is composed of toner particles containing at least a binder resin, a colorant and a wax, and an external additive. The wax has, in its DSC endothermic curve, a maximum endothermic peak at 55° C. to 80° C. within the temperature range from 30° C. to 160° C., the maximum endothermic peak having a half width of from 2° C. to 7° C., and the binder resin is composed chiefly of a polyester resin. The toner has a dynamic elastic modulus from 5×102 to 1×105 dN/m2 at 140° C., and its ratio to a dynamic elastic modulus at 170° C. is from 0.05 to 50, and the toner contains 10 to 20% by weight of THF-insoluble matter A of a binder resin component after 8 hours from the start of extraction and 1 to 10% by weight of THF-insoluble matter B of the binder resin component after 24 hours from the start of extraction, the ratio of A to B, B/A, being from 0.1 to 0.8. Also disclosed is a fixing method making use of this toner.Type: ApplicationFiled: July 10, 2002Publication date: January 15, 2004Inventors: Nobuyoshi Sugahara, Masaaki Taya, Junko Yoshikawa, Takayuki Itakura, Yojiro Hotta
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Patent number: 6653038Abstract: A toner is formed of toner particles each comprising at least a binder resin, a colorant and a wax, and inorganic fine powder. The toner is characterized by (a) containing a sulfur-containing polymer, and (b) showing dielectric loss tangent (tan&dgr;) values at 100 kHz assuming a maximum of 2.5×10−2 to 8×10−2 in a temperature range of 100 to 130° C. Because of the combination of the features (a) and (b), the toner can exhibit a good combination of developing performances and fixing performances.Type: GrantFiled: March 15, 2002Date of Patent: November 25, 2003Assignee: Canon Kabushiki KaishaInventors: Satoshi Matsunaga, Junko Yoshikawa, Ryota Kashiwabara
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Patent number: 6613490Abstract: A toner exhibiting good balance of low-temperature fixability, an anti-offset characteristic and a developing performance in continuous image formation is formed of at least a binder resin, a colorant and a wax. The toner exhibits a dielectric loss tangent showing a maximum of 6.0×10−2 to 10.0×10−2 in a temperature range of 90 to 125° C. The toner provides a DSC curve showing at least one heat-absorption peak or shoulder in a temperature range of 85 to 140° C. on temperature increase according to differential scanning calorimetry (DSC). The binder resin comprises a hybrid resin having a vinyl polymer unit and a polyester unit.Type: GrantFiled: October 29, 2001Date of Patent: September 2, 2003Assignee: Canon Kabushiki KaishaInventors: Satoshi Matsunaga, Yuichi Mizoh, Junko Yoshikawa, Ryota Kashiwabara
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Patent number: 6593052Abstract: A toner containing toner particles and an inorganic fine powder; the toner particles containing at least a binder resin, a colorant, a sulfur-containing resin, and a wax; the binder resin containing a hybrid resin component containing a vinyl type polymer unit and a polyester unit, and the sulfur-containing resin being a resin selected from the group consisting of sulfur-containing polymers and sulfur-containing copolymersType: GrantFiled: July 27, 2001Date of Patent: July 15, 2003Assignee: Canon Kabushiki KaishaInventors: Junko Yoshikawa, Yuichi Mizoo, Satoshi Matsunaga, Tadashi Dojo, Nene Shibayama, Ryota Kashiwabara
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Publication number: 20030081967Abstract: A developer supply kit for supplying a developer to an image forming apparatus, the developer supply kit includes a container for accommodating a developer; an opening provided in the container to permit discharging of the developer; a feeding member, provided in the container, for feeding the developer by rotation thereof; wherein the feeding member includes a lift portion for lifting the toner in the container, a guiding portion for guiding the toner lifted by the collecting portion downwardly toward the opening, and a falling portion for letting the toner lifted by the lifting portion fall without feeding it toward the opening with rotation of the feeding member, wherein the developer has an adhering strength which is not less than 0.60 g/cm2 and less than 3.00 g/cm2 after a vertical pressure of 128.4 g/cm2 is imparted to a layer of the developer.Type: ApplicationFiled: October 3, 2002Publication date: May 1, 2003Applicant: Canon Kabushiki KaishaInventors: Junko Yoshikawa, Yusuke Yamada
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Publication number: 20030044708Abstract: A toner is formed of toner particles each comprising at least a binder resin, a colorant and a wax, and inorganic fine powder. The toner is characterized by (a) containing a sulfur-containing polymer, and (b) showing dielectric loss tangent (tan&dgr;) values at 100 kHz assuming a maximum of 2.5×10−2 to 8×10−2 in a temperature range of 100 to 130° C. Because of the combination of the features (a) and (b), the toner can exhibit a good combination of developing performances and fixing performances.Type: ApplicationFiled: March 15, 2002Publication date: March 6, 2003Inventors: Satoshi Matsunaga, Junko Yoshikawa, Ryota Kashiwabara
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Publication number: 20020098433Abstract: A toner exhibiting good balance of low-temperature fixability, an anti-offset characteristic and a developing performance in continuous image formation is formed of at least a binder resin, a colorant and a wax. The toner exhibits a dielectric loss tangent showing a maximum of 6.0×10−2 to 10.0×10−2 in a temperature range of 90 to 125° C. The toner provides a DSC curve showing at least one heat-absorption peak or shoulder in a temperature range of 85 to 140° C. on temperature increase according to differential scanning calorimetry (DSC). The binder resin comprises a hybrid resin having a vinyl polymer unit and a polyester unit.Type: ApplicationFiled: October 29, 2001Publication date: July 25, 2002Inventors: Satoshi Matsunaga, Yuichi Mizoh, Junko Yoshikawa, Ryota Kashiwabara
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Publication number: 20020045120Abstract: A toner containing toner particles and an inorganic fine powder; the toner particles containing at least a binder resin, a colorant, a sulfur-containing resin, and a wax; the binder resin containing a hybrid resin component containing a vinyl type polymer unit and a polyester unit, and the sulfur-containing resin being a resin selected from the group consisting of sulfur-containing polymers and sulfur-containing copolymersType: ApplicationFiled: July 27, 2001Publication date: April 18, 2002Inventors: Junko Yoshikawa, Yuichi Mizoo, Satoshi Matsunaga, Tadashi Dojo, Nene Shibayama, Ryota Kashiwabara
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Patent number: 6326114Abstract: A toner includes at least a polyester resin having a carboxyl group, a coloring agent, 0.1-10 mass % of a metal salicylate compound with respect to a mass of the toner and 20-400 ppm of a hindered phenol with respect to the mass of the toner.Type: GrantFiled: April 13, 2000Date of Patent: December 4, 2001Assignee: Canon Kabushiki KaishaInventors: Takayuki Itakura, Masaaki Taya, Wakashi Iida, Junko Yoshikawa, Nobuyoshi Sugahara
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Patent number: D490844Type: GrantFiled: October 15, 2003Date of Patent: June 1, 2004Assignee: Canon Kabushiki KaishaInventors: Ayatomo Okino, Masashige Tamura, Junko Yoshikawa