Patents by Inventor Ki-won Seok
Ki-won Seok 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: 8158320Abstract: A toner includes a core containing a binder resin, wax, and a colorant, and an external additive layer coating the core, wherein the core is prepared such that it is extruded and extended to have a fiber phase, and is pulverized. The toner has an improved fixing ability to allow an electrostatic image to be fixed at a low temperature while having an excellent durability and an improved storage stability, while exhibiting reduced toner blocking and offset phenomena.Type: GrantFiled: August 19, 2008Date of Patent: April 17, 2012Assignee: Samsung Electronics Co., Ltd.Inventors: In Kim, Ki-won Seok, Kyung-yol Yon
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Patent number: 7998648Abstract: An electrophotographic developing agent is provided that includes a binder resin, a releasing agent, a colorant, and a charge control agent. By using a binder resin having a high acid value and a mixture of two waxes having different melting points as a releasing agent, a electrophotographic developing agent is obtained, which has excellent fusing property and durability and does not result in hot offset and wrap jamming.Type: GrantFiled: January 9, 2008Date of Patent: August 16, 2011Assignee: Samsung Electronics Co., Ltd.Inventors: Duck-hee Lee, Sang-deok Kim, Seok-hoon Choi, Ki-won Seok
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Patent number: 7871749Abstract: A non-magnetic one-component electrophotographic developing agent is provided having improved properties. The electrophotographic developing agent includes parent toner particles comprising a binder resin, a releasing agent, a colorant, and a charge control agent, and an external additive which is added to a surface of the parent toner particles, wherein the binder resin comprises a high viscosity polyester resin having a weight average molecular weight of about 90,000-140,000 and a gel content of less than about 5% and a low viscosity polyester resin having a weight average molecular weight of about 52,000-65,000 and a gel content of less than about 2%. According to an embodiment of the present invention, an electrophotographic developing agent having improved image gloss and fusing property, while ensuring durability may be prepared by using a blended combination of a high viscosity polyester resin and a low viscosity polyester resin.Type: GrantFiled: May 15, 2007Date of Patent: January 18, 2011Assignee: Samsung Electronics Co., Ltd.Inventors: Seok-hoon Choi, Sang-deok Kim, Duck-hee Lee, Ki-won Seok
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Publication number: 20090155701Abstract: A toner includes a core containing a binder resin, wax, and a colorant, and an external additive layer coating the core, wherein the core is prepared such that it is extruded and extended to have a fiber phase, and is pulverized. The toner has an improved fixing ability to allow an electrostatic image to be fixed at a low temperature while having an excellent durability and an improved storage stability, while exhibiting reduced toner blocking and offset phenomena.Type: ApplicationFiled: August 19, 2008Publication date: June 18, 2009Applicant: Samsung Electronics Co., LtdInventors: In KIM, Ki-won Seok, Kyung-yol Yon
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Publication number: 20080261140Abstract: An electrophotographic developing agent is provided that includes a binder resin, a releasing agent, a colorant, and a charge control agent. By using a binder resin having a high acid value and a mixture of two waxes having different melting points as a releasing agent, a electrophotographic developing agent is obtained, which has excellent fusing property and durability and does not result in hot offset and wrap jamming.Type: ApplicationFiled: January 9, 2008Publication date: October 23, 2008Inventors: Duck-hee Lee, Sang-deok Kim, Seok-hoon Choi, Ki-won Seok
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Publication number: 20080153022Abstract: A non-magnetic one-component electrophotographic developing agent is provided having improved properties. The electrophotographic developing agent includes parent toner particles comprising a binder resin, a releasing agent, a colorant, and a charge control agent, and an external additive which is added to a surface of the parent toner particles, wherein the binder resin comprises a high viscosity polyester resin having a weight average molecular weight of about 90,000-140,000 and a gel content of less than about 5% and a low viscosity polyester resin having a weight average molecular weight of about 52,000-65,000 and a gel content of less than about 2%. According to an embodiment of the present invention, an electrophotographic developing agent having improved image gloss and fusing property, while ensuring durability may be prepared by using a blended combination of a high viscosity polyester resin and a low viscosity polyester resin.Type: ApplicationFiled: May 15, 2007Publication date: June 26, 2008Inventors: Seok-hoon Choi, Sang-deok Kim, Duck-hee Lee, Ki-won Seok
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Patent number: 7374852Abstract: A liquid toner composition and a preparation method utilize a colorant, an organosol, a charge control agent, a carrier liquid, a dispersion assistant agent, and a photoreactive catalyst, in which the dispersion assistant agent is a polymer including an unsaturated functional group to cause photopolymerization in a presence of the photoreactive catalyst, and the photoreactive catalyst produces a free radical through an irradiation of light, and initiates the photopolymerization of the dispersion assistant agent. According to embodiments of the present invention, the toner organosol rarely affects the physical properties required of the liquid toner, and an offset error in a fixing operation is removed, resulting in an improved quality of a printed image.Type: GrantFiled: April 25, 2005Date of Patent: May 20, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: Kyung-yol Yon, Min-young Cheong, Ki-won Seok, Jung-wook Kim, Hae-ree Joo, Nam-jeong Lee
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Patent number: 7371496Abstract: A liquid toner for electrophotography and a method of preparing the liquid toner are disclosed. The liquid toner includes a carrier liquid, an organosol, a colorant, a charge controlling agent (CCA), and (meth)acrylic (co)polymer soluble in the carrier liquid. The liquid toner has a low solidification rate and good redispersion when left for a long period of time, especially at a high temperature for a long period of time, while maintaining the existing physical properties of a liquid toner, such as image density, at certain levels.Type: GrantFiled: December 16, 2004Date of Patent: May 13, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: Nam-Jeong Lee, Kyung-Yol Yon, Joong-Hwan Choi, Min-Young Cheong, Ki-Won Seok
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Patent number: 7349654Abstract: A developer cartridge for a wet-type image forming apparatus including a cartridge body in which developer is stored. The cartridge body has a supply hole formed thereon to supply the developer in the cartridge to the image forming apparatus. A filter is disposed in the cartridge body to improve the dispersion of the developer, and to filter sludge of the developer before the developer flows into the supply hole.Type: GrantFiled: November 3, 2005Date of Patent: March 25, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: Hae-Ree Joo, Jung-Wook Kim, Ki-Won Seok, Kyung-Yol Yon, Deuck-Woo Jang, Min-Young Cheong
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Patent number: 7248060Abstract: A test apparatus to evaluate the electrical properties of a liquid toner in which a printing quality of the liquid toner may be predicted by evaluating the electrical properties of the liquid toner without performing printing. The test apparatus to evaluate the electrical properties of a liquid toner includes a roller, a conductive flat panel positioned below the roller to move a predetermined distance in contact with the roller, a power supply device applying a voltage to the roller and the conductive flat panel, and a voltage tester provided at the rear of the roller to move together with the roller, testing a voltage of the liquid toner arranged on the conductive flat panel.Type: GrantFiled: September 1, 2005Date of Patent: July 24, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Jung-wook Kim, Ki-won Seok, Kyung-yol Yon, Deuck-woo Jang, Hae-ree Joo, Min-young Cheong
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Publication number: 20070071515Abstract: A fixing unit includes a heating roller having a heating part, and a pressing roller disposed corresponding to the heating roller. A frame surrounds the heating and pressing rollers and allows a recording medium to pass between the rollers. The frame is mounted with a heat reflective layer on an inner surface thereof. An adiabatic layer may be disposed between the heat reflective layer and the frame. The heat reflective layer may be provided only proximal both sides of the frame when using an adiabatic layer. Accordingly, the initial heating time of the fixing unit, heat loss, and power consumption may be reduced.Type: ApplicationFiled: July 27, 2006Publication date: March 29, 2007Inventors: Deuck-woo Jang, Ki-won Seok
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Publication number: 20060133852Abstract: A developer cartridge for a wet-type image forming apparatus comprises a cartridge body in which developer is stored. The cartridge body has a supply hole formed thereon to supply the developer in the cartridge to the image forming apparatus. A filter is disposed in the cartridge body to improve the dispersion of the developer, and to filter sludge of the developer before the developer flows into the supply hole.Type: ApplicationFiled: November 3, 2005Publication date: June 22, 2006Inventors: Hae-Ree Joo, Jung-Wook Kim, Ki-Won Seok, Kyung-Yol Yon, Deuck-Woo Jang, Min-Young Cheong
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Publication number: 20060049837Abstract: A test apparatus to evaluate the electrical properties of a liquid toner in which a printing quality of the liquid toner may be predicted by evaluating the electrical properties of the liquid toner without performing printing. The test apparatus to evaluate the electrical properties of a liquid toner includes a roller, a conductive flat panel positioned below the roller to move a predetermined distance in contact with the roller, a power supply device applying a voltage to the roller and the conductive flat panel, and a voltage tester provided at the rear of the roller to move together with the roller, testing a voltage of the liquid toner arranged on the conductive flat panel.Type: ApplicationFiled: September 1, 2005Publication date: March 9, 2006Applicant: Samsung Electronics Co., Ltd.Inventors: Jung-wook Kim, Ki-won Seok, Kyung-yol Yon, Deuck-woo Jang, Hae-ree Joo, Min-young Cheong
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Publication number: 20050244736Abstract: A liquid toner composition and a preparation method utilize a colorant, an organosol, a charge control agent, a carrier liquid, a dispersion assistant agent, and a photoreactive catalyst, in which the dispersion assistant agent is a polymer including an unsaturated functional group to cause photopolymerization in a presence of the photoreactive catalyst, and the photoreactive catalyst produces a free radical through an irradiation of light, and initiates the photopolymerization of the dispersion assistant agent. According to embodiments of the present invention, the toner organosol rarely affects the physical properties required of the liquid toner, and an offset error in a fixing operation is removed, resulting in an improved quality of a printed image.Type: ApplicationFiled: April 25, 2005Publication date: November 3, 2005Applicant: Samsung Electronics Co., Ltd.Inventors: Kyung-yol Yon, Min-young Cheong, Ki-won Seok, Jung-wook Kim, Hae-ree Joo, Nam-jeong Lee
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Publication number: 20050153226Abstract: A liquid toner for electrophotography and a method of preparing the liquid toner are disclosed. The liquid toner includes a carrier liquid, an organosol, a colorant, a charge controlling agent (CCA), and (meth)acrylic (co)polymer soluble in the carrier liquid. The liquid toner has a low solidification rate and good redispersion when left for a long period of time, especially at a high temperature for a long period of time, while maintaining the existing physical properties of a liquid toner, such as image density, at certain levels.Type: ApplicationFiled: December 16, 2004Publication date: July 14, 2005Inventors: Nam-Jeong Lee, Kyung-Yol Yon, Joong-Hwan Choi, Min-Young Cheong, Ki-Won Seok