Patents by Inventor Joong-hwan Choi
Joong-hwan Choi 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: 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: 7259193Abstract: A liquid ink composition includes a colorant, a charge control agent, an organosol, a carrier liquid, and a storage stabilizer. The storage stabilizer is a metal salt of a metal cation and an organic anion having 15 to 30 carbon atoms. The liquid ink composition is produced by a method of adding the storage stabilizer in an effective amount to improve the dispersibility and storage stability at high temperatures without deteriorating the electrical property and the optical density of the liquid ink composition. The storage stabilizer can be a metal salt of C15 to C30 alkyl carboxylate or a metal salt of a C15 to C30 alkyl sulfonate.Type: GrantFiled: September 22, 2004Date of Patent: August 21, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Kyung-yol Yon, Nam-jeong Lee, Hae-ree Joo, Joong-hwan Choi
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Patent number: 7245846Abstract: An oxidation catalyst unit for a wet-type electrophotographic image forming apparatus which filters a vapor produced at a fusing unit and a method thereof are provided. The oxidation catalyst unit and method includes a duct for guiding the carrier vapor produced at the fusing unit into the oxidation catalyst unit, a heater for heating the carrier vapor being guided along the duct, an oxidation catalyst carrying medium disposed behind the heater for catalyzing an oxidation reaction of the carrier vapor guided along the duct, and an absorbent filter for preventing entry of the carrier vapor into the oxidation catalyst in the form of liquid drops.Type: GrantFiled: September 9, 2004Date of Patent: July 17, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Kwoang-joe Seorl, Joong-hwan Choi, Young-joon Lee
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Patent number: 7149454Abstract: An exhaust system of a liquid electrophotography printer includes: an exhaust line to discharge air inside an engine cell to an outside thereof; at least one exhaust fan, which is installed inside the exhaust line to generate and move the air inside the engine cell; a heating coil to heat the air to be discharged through the exhaust line to ignite impurities contained in the air; and an oxidative catalyst filter to filter and deodorize the impurities. The heating coil may be installed inside the exhaust line and coated with platinum on the outer surface. The oxidative catalyst filter may be installed inside the exhaust line, and may be a metallic honeycomb carrier coated with a catalyst mixture, or a non-woven heating mat coated with a catalyst mixture. The heating coil and the oxidative catalyst filter are typically sequentially installed adjacent to each other.Type: GrantFiled: November 20, 2003Date of Patent: December 12, 2006Assignee: Samsung Electronics Co., Ltd.Inventors: Kyung-yol Yon, Young-ha No, Kwang-ho No, Jeong-hun Pang, Joong-hwan Choi
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Patent number: 7027752Abstract: A wet-type electrophotographic printer having a photocatalystic filter includes a discharge passage through which air inside a printer body is discharged out, at least one discharge fan positioned inside the discharge passage to guide the air inside the printer body, and a photocatalystic filter positioned inside the discharge passage and having a photocatalystic body coated with a photocatalyst, a plasma electrode and a plasma generator to filter and deodorize the air inside the printer body. Accordingly, a bad smell and air pollution from evaporation of a liquid carrier can be solved, and an excellent printing quality is provided.Type: GrantFiled: August 28, 2003Date of Patent: April 11, 2006Assignee: Samsung Electronics Co., Ltd.Inventors: Kyung-yol Yon, Jeong-hun Pang, Joong-hwan Choi
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Patent number: 6996352Abstract: A gas exhausting apparatus for use in a wet electrophotographic image forming device includes an exhaust duct, an exhaust fan, and an air purification unit. The exhaust duct forms an air flow passage from an inside of a device to an outside of the device. The exhaust fan inhales air from the inside of the device through the exhaust duct and exhausting the air through the exhaust duct to the outside of the device. The air purification unit removes impurities included in the air inhaled by the exhaust fan.Type: GrantFiled: November 14, 2003Date of Patent: February 7, 2006Assignee: Samsung Electronics Co., Ltd.Inventors: Joong-hwan Choi, Jeong-hun Pang
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Publication number: 20050244183Abstract: An oxidation catalyst unit for a wet-type electrophotographic image forming apparatus which filters a vapor produced at a fusing unit and a method thereof are provided. The oxidation catalyst unit and method comprise a duct for guiding the carrier vapor produced at the fusing unit into the oxidation catalyst unit, a heater for heating the carrier vapor being guided along the duct, an oxidation catalyst carrying medium disposed behind the heater for catalyzing an oxidation reaction of the carrier vapor guided along the duct, and an absorbent filter for preventing entry of the carrier vapor into the oxidation catalyst in the form of liquid drops.Type: ApplicationFiled: September 9, 2004Publication date: November 3, 2005Inventors: Kwoang-joe Seorl, Joong-hwan Choi, Young-joon Lee
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Patent number: 6951703Abstract: A liquid developer for high-quality image reproduction and a method of preparing the liquid developer. The liquid developer exhibits good pigment dispersion by the introduction of organosol. The liquid developer contains fine toner particles of a uniform size with a volume-average to number-average particle diameter ratio of 1.5-2.5, and thus can produce high-resolution images. The liquid developer preparation method is environmentally friendly, simple, and cost effective because no cosolvent is used, thus eliminating the need for a cosolvent removal process.Type: GrantFiled: April 28, 2003Date of Patent: October 4, 2005Assignee: Samsung Electronics Co., Ltd.Inventors: Seong-joon Chae, Kyung-yol Yon, Joong-hwan Choi, Jeong-hun Pang
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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
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Publication number: 20050075417Abstract: A liquid ink composition includes a colorant, a charge control agent, an organosol, a carrier liquid, and a storage stabilizer. The storage stabilizer is a metal salt of a metal cation and an organic anion having 15 to 30 carbon atoms. The liquid ink composition is produced by a method of adding the storage stabilizer in an effective amount to improve the dispersibility and storage stability at high temperatures without deteriorating the electrical property and the optical density of the liquid ink composition. The storage stabilizer can be a metal salt of C15 to C30 alkyl carboxylate or a metal salt of a C15 to C30 alkyl sulfonate.Type: ApplicationFiled: September 22, 2004Publication date: April 7, 2005Inventors: Kyung-yol Yon, Nam-jeong Lee, Hae-ree Joo, Joong-hwan Choi
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Publication number: 20040225030Abstract: A liquid ink composition and a method for producing the same, wherein the liquid ink composition includes a colorant, a charge control agent to regulate electrostatic properties of the colorant, and an organosol to disperse and bind the colorant and the charge control agent. The colorant may be coated with a thermoplastic resin to improve binding with the organosol. By coating the colorant with the thermoplastic resin, the affinity of the colorant for the organosol is facilitated, increasing a size of particles in the liquid ink composition, so that the control of the particles improves the image quality, and micro particles of the carbon black pigment alone do not substantially exist in the printer to prevent printing on a non-image area, thus producing a clear printed image and preventing contamination of other parts in the printer during printing.Type: ApplicationFiled: February 5, 2004Publication date: November 11, 2004Applicant: Samsung Electronics Co., Ltd.Inventors: Kyung-yol Yon, Nam-jeong Lee, Hae-ree Joo, Joong-hwan Choi
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Publication number: 20040146314Abstract: An exhaust system of a liquid electrophotography printer includes: an exhaust line to discharge air inside an engine cell to an outside thereof; at least one exhaust fan, which is installed inside the exhaust line to generate and move the air inside the engine cell; a heating coil to heat the air to be discharged through the exhaust line to ignite impurities contained in the air; and an oxidative catalyst filter to filter and deodorize the impurities. The heating coil may be installed inside the exhaust line and coated with platinum on the outer surface. The oxidative catalyst filter may be installed inside the exhaust line, and may be a metallic honeycomb carrier coated with a catalyst mixture, or a non-woven heating mat coated with a catalyst mixture. The heating coil and the oxidative catalyst filter are typically sequentially installed adjacent to each other.Type: ApplicationFiled: November 20, 2003Publication date: July 29, 2004Applicant: SAMSUNG Electronics Co., Ltd.Inventors: Kyung-Yol Yon, Young-Ha No, Kwang-Ho No, Jeong-Hun Pang, Joong-Hwan Choi
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Publication number: 20040105697Abstract: A gas exhausting apparatus for use in a wet electrophotographic image forming device includes an exhaust duct, an exhaust fan, and an air purification unit. The exhaust duct forms an air flow passage from an inside of a device to an outside of the device. The exhaust fan inhales air from the inside of the device through the exhaust duct and exhausting the air through the exhaust duct to the outside of the device. The air purification unit removes impurities included in the air inhaled by the exhaust fan.Type: ApplicationFiled: November 14, 2003Publication date: June 3, 2004Applicant: SAMSUNG Electronics Co., Ltd.Inventors: Joong-Hwan Choi, Jeong-Hun Pang
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Publication number: 20040047646Abstract: A wet-type electrophotographic printer having a photocatalystic filter includes a discharge passage through which air inside a printer body is discharged out, at least one discharge fan positioned inside the discharge passage to guide the air inside the printer body, and a photocatalystic filter positioned inside the discharge passage and having a photocatalystic body coated with a photocatalyst, a plasma electrode and a plasma generator to filter and deodorize the air inside the printer body. Accordingly, a bad smell and air pollution from evaporation of a liquid carrier can be solved, and an excellent printing quality is provided.Type: ApplicationFiled: August 28, 2003Publication date: March 11, 2004Applicant: Samsung Electronics Co., Ltd.Inventors: Kyung-yol Yon, Jeong-hun Pang, Joong-hwan Choi
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Publication number: 20040047645Abstract: A wet type electrophotographic printer having a catalyst oxidation filter therein includes a discharge passage to discharge air inside of a printer body to the outside, a blower in the discharge passage to guide the air inside of the printer body, and a catalyst oxidation filter arranged in the discharge passage. The catalyst oxidation filter includes a matrix coated with an oxidation catalyst, to deodorize the air which is guided to the discharge passage as the air is passed therethrough.Type: ApplicationFiled: July 14, 2003Publication date: March 11, 2004Applicant: Samsung Electronics Co., Ltd.Inventors: Young-Ha No, Kwang-Ho No, Kyong-Yol Yon, Jeong-Hun Pang, Joong-Hwan Choi
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Publication number: 20040002014Abstract: A liquid developer for high-quality image reproduction and a method of preparing the liquid developer. The liquid developer exhibits good pigment dispersion by the introduction of organosol. The liquid developer contains fine toner particles of a uniform size with a volume-average to number-average particle diameter ratio of 1.5-2.5, and thus can produce high-resolution images. The liquid developer preparation method is environmentally friendly, simple, and cost effective because no cosolvent is used, thus eliminating the need for a cosolvent removal process.Type: ApplicationFiled: April 28, 2003Publication date: January 1, 2004Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Seong-joon Chae, Kyung-yol Yon, Joong-hwan Choi, Jeong-hun Pang