Patents by Inventor Jae Joon Chang
Jae Joon Chang 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: 11623987Abstract: The present disclosure relates to a polycarbonate resin composition having excellent light-reflecting and light-shielding properties, and an automotive molded article produced using the same. The polycarbonate resin composition includes: 60 to 70 wt % of a polycarbonate resin; 4 to 10 wt % of a rubber-modified vinyl-based graft copolymer; 3 to 11 wt % of a styrene-based copolymer; 15 to 25 wt % of titanium dioxide; and 2 to 3 wt % of a mineral filler.Type: GrantFiled: August 4, 2020Date of Patent: April 11, 2023Assignees: HYUNDAI MOBIS CO., LTD., LG CHEM, LTD.Inventors: Jae Joon Chang, Myeung Il Kim, Jae Hwan Kim, Jin Sol Park, Soo Min Lee
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Publication number: 20220010130Abstract: The present disclosure relates to a light transmissive molded article including a base layer molded from a thermoplastic resin composition and a coating layer formed on at least one surface of the base layer, wherein peak energy PEA is equal to or greater than 40 J when impact energy of 140 J is applied with a rod having a diameter of 12.7 mm and a thickness of 3.0 mm by ASTM D3763, wherein, when being exposed at 90° C. for 500 hours, a color difference ?E1 based on color coordinates (L*0, a*0, b*0) of a CIE LAB color space before the exposure and color coordinates (L*A, a*A, b*A) of the CIE LAB color space after the exposure satisfies Equation 1 below, and light transmittance T0 before the exposure and light transmittance TA after the exposure satisfy Equation 2 below: ?E1?2.0??[Equation 1] 0.95?TA/T0?1.05.Type: ApplicationFiled: July 6, 2021Publication date: January 13, 2022Applicants: HYUNDAI MOBIS CO., LTD., LG CHEM, LTD.Inventors: Jae Joon CHANG, Moo Seok LEE, Myeung Il KIM, Soo Min LEE, Young Min KIM
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Patent number: 10982091Abstract: The present invention relates to a thermoplastic resin composition having excellent thermal stability and birefringence properties and to a molded article formed therefrom. In one embodiment, the thermoplastic resin composition includes: 100 parts by weight of a polycarbonate resin including a repeating unit represented by formula 1; about 0.2 parts by weight to about 15 parts by weight of an epoxy resin represented by formula 2; and about 1 part by weight to about 15 parts by weight of a phosphate-based compound, wherein formula 1 and formula 2 are as defined in the detailed description.Type: GrantFiled: August 21, 2018Date of Patent: April 20, 2021Assignees: HYUNDAI MOBIS CO., LTD., SAMYANG CORPORATIONInventors: Jae Joon Chang, Joung Hoon Lee, Hyun Jee Lee, Keun Hyung Lee, Jung Kyu Han, Tae Jin An, Nung Hyun Kim, Hyung Jin Roh
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Publication number: 20210040313Abstract: The present disclosure relates to a polycarbonate resin composition having excellent light-reflecting and light-shielding properties, and an automotive molded article produced using the same. The polycarbonate resin composition includes: 60 to 70 wt % of a polycarbonate resin; 4 to 10 wt % of a rubber-modified vinyl-based graft copolymer; 3 to 11 wt % of a styrene-based copolymer; 15 to 25 wt % of titanium dioxide; and 2 to 3 wt % of a mineral filler.Type: ApplicationFiled: August 4, 2020Publication date: February 11, 2021Inventors: Jae Joon CHANG, Myeung Il KIM, Jae Hwan KIM, Jin Sol PARK, Soo Min LEE
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Publication number: 20190055401Abstract: The present invention relates to a thermoplastic resin composition having excellent thermal stability and birefringence properties and to a molded article formed therefrom. In one embodiment, the thermoplastic resin composition includes: 100 parts by weight of a polycarbonate resin including a repeating unit represented by formula 1; about 0.2 parts by weight to about 15 parts by weight of an epoxy resin represented by formula 2; and about 1 part by weight to about 15 parts by weight of a phosphate-based compound, wherein formula 1 and formula 2 are as defined in the detailed description.Type: ApplicationFiled: August 21, 2018Publication date: February 21, 2019Inventors: Jae Joon CHANG, Joung Hoon LEE, Hyun Jee LEE, Keun Hyung LEE, Jung Kyu HAN, Tae Jin AN, Nung Hyun KIM, Hyung Jin ROH
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Publication number: 20150159013Abstract: A thermoplastic polycarbonate resin composition may include about 50 to about 70 wt % of a polycarbonate resin; about 5 to about 20 wt % of a vinyl cyanide compound-conjugated diene-vinyl aromatic hydrocarbon copolymer; about 10 to about 30 wt % of a polyester resin; about 3 to about 15 wt % of a maleimide-based copolymer; about 2 to about 10 wt % of an impact modifier; and about 0.1 to about 1.0 wt % of a nucleating agent, wherein the polycarbonate resin has a melt index of about 2 to about 20 g/10 min (300° C., 2.16 kg). The thermoplastic polycarbonate resin composition has excellent chemical resistance and mechanical properties.Type: ApplicationFiled: July 2, 2014Publication date: June 11, 2015Inventors: Jae Joon Chang, Hyeon Don Kim, Yong Chun, Myeung Il Kim, Jong Kuk Choi, Yong Kim, Sung Ho Lee, Dae Yong Ok
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Patent number: 9045633Abstract: A thermoplastic polycarbonate resin composition may include about 50 to about 70 wt % of a polycarbonate resin; about 5 to about 20 wt % of a vinyl cyanide compound-conjugated diene-vinyl aromatic hydrocarbon copolymer; about 10 to about 30 wt % of a polyester resin; about 3 to about 15 wt % of a maleimide-based copolymer; about 2 to about 10 wt % of an impact modifier; and about 0.1 to about 1.0 wt % of a nucleating agent, wherein the polycarbonate resin has a melt index of about 2 to about 20 g/10 min (300° C., 2.16 kg). The thermoplastic polycarbonate resin composition has excellent chemical resistance and mechanical properties.Type: GrantFiled: July 2, 2014Date of Patent: June 2, 2015Assignees: Hyundai Mobis Co., Ltd., LG Chem. Ltd.Inventors: Jae Joon Chang, Hyeon Don Kim, Yong Chun, Myeung Il Kim, Jong Kuk Choi, Yong Kim, Sung Ho Lee, Dae Yong Ok
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Patent number: 8674486Abstract: Systems and methods pertaining to a digital signal isolator device are described. In one embodiment, the device includes an isolation barrier and two metal support paddles. The isolation barrier contains an organic and/or a semi-organic insulating material with at least one capacitor embedded inside. One of the two metal support paddles is located below a first portion of a bottom surface of the isolation barrier to provide support to the isolation barrier, while the other metal support paddle is located below a second portion of a bottom surface of the isolation barrier to provide support to the isolation barrier.Type: GrantFiled: December 14, 2011Date of Patent: March 18, 2014Assignee: Samsung Electro-MechanicsInventors: Geoffrey T Haigh, Matthew Kuhn, Patrick Melet, Romain Pelard, Jae Joon Chang, Youngsik Hur
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Publication number: 20130170840Abstract: A communication system includes a hybrid signal transmitter incorporating a signal routing circuit and a driver circuit. The signal routing circuit is configured to receive a first input signal and route the first input signal through a first signal path when the frequency bandwidth of the input signal is lower than a threshold frequency and through a second signal path when the frequency bandwidth exceeds the threshold frequency. The second signal path includes a frequency down-converter circuit. The driver circuit is configured to receive the routed input signal via the first signal path or the second signal path, and convert the routed input signal into an optical signal for coupling into an optical fiber.Type: ApplicationFiled: July 27, 2012Publication date: July 4, 2013Applicant: SAMSUNG ELECTRO-MECHANICS COMPANY, LTD.Inventors: Jae Joon Chang, Youngsik Hur
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Publication number: 20130154071Abstract: Systems and methods pertaining to a digital signal isolator device are described. In one embodiment, the device includes an isolation barrier and two metal support paddles. The isolation barrier contains an organic and/or a semi-organic insulating material with at least one capacitor embedded inside. One of the two metal support paddles is located below a first portion of a bottom surface of the isolation barrier to provide support to the isolation barrier, while the other metal support paddle is located below a second portion of a bottom surface of the isolation barrier to provide support to the isolation barrier.Type: ApplicationFiled: December 14, 2011Publication date: June 20, 2013Applicant: Samsung Electro-Mechanics Company, Ltd.Inventors: Geoffrey T. Haigh, Matthew Kuhn, Patrick Melet, Romain Pelard, Jae Joon Chang, Youngsik Hur
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Patent number: 8378749Abstract: Systems and methods may include an amplifier having at least a first input port, where the amplifier includes a first capacitance associated with the first input port; a first bias circuit, where the first bias circuit comprises a series connection of a first charging circuit and a first discharging circuit, wherein a first node between the first charging circuit and the first discharging circuit is connected to the first input port, wherein responsive to an RF input signal having at least a first predetermined level being received at the first input port, the first charging circuit charges the first capacitance associated with the first input port during a first portion of a cycle of the RF input signal, and discharges the first capacitance associated with the first input port during a second portion of the cycle, thereby controlling a DC bias voltage level available at the first input port.Type: GrantFiled: July 29, 2011Date of Patent: February 19, 2013Assignee: Samsung Electro-MechanicsInventors: Woonyun Kim, Jeonghu Han, Ki Seok Yang, Jae Joon Chang, Chang-Ho Lee
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Publication number: 20130029614Abstract: Systems, methods, and apparatuses may provide for antenna switch controllers. An example antenna switch controller may include: a plurality of antenna switches commonly connected to one or more antennas, where each of the plurality of antenna switches includes a plurality of stacked transistors, where one of the plurality of antenna switches is enabled when transmitting or receiving one or more radio frequency (RF) signals via the one or more antennas; a voltage generator that receives an external supply voltage from a battery, where the voltage generator generates an internal supply voltage, where the internal supply voltage remains constant despite fluctuations in the external supply voltage from the battery; a clock buffer that generates clock signals from the constant internal supply voltage; and a charge pump that receives the clock signals and generates a constant negative voltage, where the constant negative voltage is for biasing of one or more of the plurality of antenna switches that are disabled.Type: ApplicationFiled: July 29, 2011Publication date: January 31, 2013Applicant: SAMSUNG ELECTRO-MECHANICS COMPANYInventors: Changhyuk Cho, Jeongwon Cha, Minsik Ahn, Chang-Ho Lee, Wyangmyong Woo, Jae Joon Chang
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Publication number: 20130027135Abstract: Systems and methods may include an amplifier having at least a first input port, where the amplifier includes a first capacitance associated with the first input port; a first bias circuit, where the first bias circuit comprises a series connection of a first charging circuit and a first discharging circuit, wherein a first node between the first charging circuit and the first discharging circuit is connected to the first input port, wherein responsive to an RF input signal having at least a first predetermined level being received at the first input port, the first charging circuit charges the first capacitance associated with the first input port during a first portion of a cycle of the RF input signal, and discharges the first capacitance associated with the first input port during a second portion of the cycle, thereby controlling a DC bias voltage level available at the first input port.Type: ApplicationFiled: July 29, 2011Publication date: January 31, 2013Applicant: SAMSUNG ELECTRO-MECHANICS COMPANYInventors: Woonyun Kim, Jeonghu Han, Ki Seok Yang, Jae Joon Chang, Chang-Ho Lee
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Publication number: 20130028600Abstract: A communication system includes a configurable transceiver that accommodates multi-band, multi-format signals by incorporating a duplex transceiver circuit, a simplex transceiver circuit and at least two switches. A first switch may be operated so as to configure the configurable transceiver to propagate duplex signals, such as for example, frequency division multiplexed (FDD) signals. The second switch may be operated so as to configure the simplex transceiver circuit to provide signal propagation of various types of signals in either a receive direction or a transmit direction. The various types of signals include time division multiplexed (TDD) signals.Type: ApplicationFiled: July 27, 2012Publication date: January 31, 2013Applicant: SAMSUNG ELECTRO-MECHANICS COMPANY, LTD.Inventors: Jae Joon Chang, Youngsik Hur
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Patent number: 8334708Abstract: Example driver circuits can utilize shared-charge recycling charge pump structures. In particular, an example shared-charge recycling process may be applied to a clock buffer and charge transfer cells of the charge pump in a driver circuit. An example recycling process may include recycling of shared charges between the capacitors/capacitances in the charge transfer cells. An example recycling process may use the charges in one or more capacitors to charge one or more other capacitors before the charges are wasted or otherwise discharged to ground. Such recycling may significantly reduce the power consumption of the charge pump while still providing a high output voltage level, according to an example embodiment of the invention.Type: GrantFiled: July 29, 2011Date of Patent: December 18, 2012Assignee: Samsung Electro-MechanicsInventors: Jeongwon Cha, Taejoong Song, Changhyuk Cho, Minsik Ahn, Chang-Ho Lee, Wangmyong Woo, Jae Joon Chang
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Patent number: 7218654Abstract: A method for calibrating a laser transmitter includes (a) detecting an eye diagram of an output from the laser transmitter, (b) determining if the eye diagram is acceptable, (c) if the eye diagram is not acceptable, changing a value of a control signal in the laser transmitter, wherein the control signal sets an amplitude characteristic of a limiting amplifier coupled to a laser driver in the laser transmitter, and (d) repeating steps (a), (b), and (c) until the eye diagram is acceptable.Type: GrantFiled: August 16, 2005Date of Patent: May 15, 2007Assignee: Avago Technologies Fiber IP (Singapore) Pte. Ltd.Inventors: Young Gon Kim, Jae Joon Chang, Myunghee Lee
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Patent number: 7167491Abstract: A laser transmitter includes an input stage generating an input signal to a limiting amplifier, the limiting amplifier generating an input signal to a laser driver, and the laser driver generating an input signal to a light source. The limiting amplifier has a control terminal for receiving a control signal that sets an amplitude characteristic of the input signal to the laser driver. The amplitude characteristic may be a common-mode or a peak amplitude of the input signal to the laser driver.Type: GrantFiled: September 10, 2003Date of Patent: January 23, 2007Assignee: Avago Technologies Fiber IP (Singapore) Pte. Ltd.Inventors: Young Gon Kim, Jae Joon Chang, Myunghee Lee
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Publication number: 20020070766Abstract: The present invention is a signal detect (SD)/loss-of-signal (LOS) circuit that is able to discern between received Signal and Noise in Digital Amplitude Modulated transmission systems. A window detector, having a low and high voltage limit, receives an input signal. A low pass filter having an output connects to the window detector. A differential comparator compares the output of the low pass filter at a negative input and a threshold voltage signal to generate an output signal indicative of the average power of the input signal.Type: ApplicationFiled: December 11, 2000Publication date: June 13, 2002Inventors: Stefano G. Therisod, Jae Joon Chang, Myunghee Lee