Patents by Inventor Na Chang
Na 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: 11878921Abstract: The invention relates to the field of industrial wastewater treatment, and particularly discloses a nanofiltration membrane for treating printing and dyeing wastewater and its preparation method. The preparation method comprises the following steps: S1, pouring an aqueous solution containing m-phenylenediamine, camphorsulfonic acid and triethylamine onto the surface of a polysulfone ultrafiltration membrane, setting still for 10 s to 30 s, and then removing the excess aqueous solution from the surface; S2, pouring an organic solution containing trimesoyl chloride and an interface auxiliary polymerization agent onto the surface of the membrane obtained in step S1, reacting for 5 s to 20 s, and then removing the excess solution from the surface; and S3, setting the membrane obtained in step S2 still and then carrying out heat treatment and water rinsing on the membrane in sequence, thus obtaining the nanofiltration membrane.Type: GrantFiled: August 16, 2022Date of Patent: January 23, 2024Assignees: Tiangong University, Zhejiang Jinmo Environmental Technology Co., LtdInventors: Na Chang, Haitao Wang, Yinong Xu, Donggen Chen, Rui Liu, Wei Shao, Zedong Li, Yanjun Jia, Miaomiao Yin
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Patent number: 11802068Abstract: The present application relates to a preparation method for recycling inorganic salt in printing and dyeing wastewater and comprises the following process steps: S1, performing impurity removal, softening, COD removal and decoloration on reverse osmosis (RO) membrane concentrated water to obtain pretreated wastewater; S2, performing two-stage electrodialysis on the wastewater obtained in step S1: returning fresh water obtained in a first-stage electrodialysis desalination chamber to a front end of the RO process, and taking saline water obtained in a concentration chamber as raw water of a second-stage electrodialysis desalination chamber and a second-stage electrodialysis concentration chamber; and returning the fresh water obtained by the second-stage electrodialysis desalination chamber to the first-stage electrodialysis concentration chamber; and S3, dealkalizing the concentrated saline water obtained in the step S2 and then adjusting the pH value to obtain concentrated saline water capable of being reuseType: GrantFiled: February 6, 2022Date of Patent: October 31, 2023Assignees: Tiangong University, Zhejiang Jinmo Environmental Technology Co., LtdInventors: Haitao Wang, Na Chang, Yan Wang, Yinong Xu, Qiliang Wang, Rui Liu, Tieying Jin, Ruhan A, Hao Zhang, Wei Shao, Yanjun Jia
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Publication number: 20230100994Abstract: The invention relates to the field of industrial wastewater treatment, and particularly discloses a nanofiltration membrane for treating printing and dyeing wastewater and its preparation method. The preparation method comprises the following steps: S1, pouring an aqueous solution containing m-phenylenediamine, camphorsulfonic acid and triethylamine onto the surface of a polysulfone ultrafiltration membrane, setting still for 10 s to 30 s, and then removing the excess aqueous solution from the surface; S2, pouring an organic solution containing trimesoyl chloride and an interface auxiliary polymerization agent onto the surface of the membrane obtained in step S1, reacting for 5 s to 20 s, and then removing the excess solution from the surface; and S3, setting the membrane obtained in step S2 still and then carrying out heat treatment and water rinsing on the membrane in sequence, thus obtaining the nanofiltration membrane.Type: ApplicationFiled: August 16, 2022Publication date: March 30, 2023Applicants: Tiangong University, Zhejiang Jinmo Environmental Technology Co., LtdInventors: Na Chang, Haitao Wang, Yinong Xu, Donggen Chen, Rui Liu, Wei Shao, Zedong Li, Yanjun Jia, Miaomiao Yin
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Patent number: 11587693Abstract: The present disclosure provides a solidifying method of a radionuclide. The solidifying method of the radionuclide includes operations of: providing a low melting point glass including Bi2O3, B2O3, ZnO and SiO2; providing a glass mixture mixing a mixture to be treated containing a hydroxide of radionuclide and BaSO4 and the low melting point glass; and heating the glass mixture.Type: GrantFiled: April 27, 2020Date of Patent: February 21, 2023Assignee: Korea Atomic Energy Research InstituteInventors: Hee Chul Eun, Na On Chang, Seon Byeong Kim, Wang Kyu Choi, Sang Yoon Park, Hui Jun Won, Man Soo Choi, Byung Seon Choi, Jei Kwon Moon, Chong Hun Jung, Song Bok Lee, Sang Hun Lee, Bum Kyoung Seo
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Publication number: 20220250958Abstract: The present application relates to a preparation method for recycling inorganic salt in printing and dyeing wastewater and comprises the following process steps: S1, performing impurity removal, softening, COD removal and decoloration on reverse osmosis (RO) membrane concentrated water to obtain pretreated wastewater; S2, performing two-stage electrodialysis on the wastewater obtained in step S1: returning fresh water obtained in a first-stage electrodialysis desalination chamber to a front end of the RO process, and taking saline water obtained in a concentration chamber as raw water of a second-stage electrodialysis desalination chamber and a second-stage electrodialysis concentration chamber; and returning the fresh water obtained by the second-stage electrodialysis desalination chamber to the first-stage electrodialysis concentration chamber; and S3, dealkalizing the concentrated saline water obtained in the step S2 and then adjusting the pH value to obtain concentrated saline water capable of being reuseType: ApplicationFiled: February 6, 2022Publication date: August 11, 2022Applicants: Tiangong University, Zhejiang Jinmo Environmental Technology Co., LtdInventors: Haitao Wang, Na Chang, Yan Wang, Yinong Xu, Qiliang Wang, Rui Liu, Tieying Jin, Ruhan A, Hao Zhang, Wei Shao, Yanjun Jia
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Publication number: 20210335513Abstract: The present disclosure provides a solidifying method of a radionuclide. The solidifying method of the radionuclide includes operations of: providing a low melting point glass including Bi2O3, B2O3, ZnO and SiO2; providing a glass mixture mixing a mixture to be treated containing a hydroxide of radionuclide and BaSO4 and the low melting point glass; and heating the glass mixture.Type: ApplicationFiled: April 27, 2020Publication date: October 28, 2021Inventors: Hee Chul Eun, Na On Chang, Seon Byeong Kim, Wang Kyu Choi, Sang Yoon Park, Hui Jun Won, Man Soo Choi, Byung Seon Choi, Jei Kwon Moon, Chong Hun Jung, Song Bok Lee, Sang Hun Lee, Bum Kyoung Seo
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Patent number: 8577167Abstract: The invention discloses an image processing system and method thereof. The image processing system includes an local variance estimator, a noise detector, a spatial de-noise filter. The local variance estimator estimates each pixel of an input image signal to separately output a local variance value of each pixel, and generates a noise threshold according to the local variance values. The noise detector determines which pixel indicates noise or image according to the noise threshold. The spatial de-noise filter filers the pixel indicating noise to generate an output image signal.Type: GrantFiled: March 29, 2011Date of Patent: November 5, 2013Assignee: Realtek Semiconductor Corp.Inventors: Wei-Na Chang, Chia-Wei Yu
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Publication number: 20110243472Abstract: The invention discloses an image processing device and method thereof. The image processing device includes an local variance estimator, a noise detector, a spatial de-noise filter. The local variance estimator estimates each pixel of an input image signal to separately output a local variance value of each pixel, and generates a noise threshold according to the local variance values. The noise detector determines which pixel indicates noise or image according to the noise threshold. The spatial de-noise filter filers the pixel indicating noise to generate an output image signal.Type: ApplicationFiled: March 29, 2011Publication date: October 6, 2011Inventors: Wei-Na CHANG, Chia-Wei Yu
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Patent number: 7755031Abstract: A calibration phantom for quality assurance of an image-based radiotherapy apparatus The calibration phantom includes a body comprising a cylindrical acryl member having a predetermined diameter, the body having a center hole at a center axis thereof and a plurality of through-holes in outer circumferential portions thereof at a predetermined interval from the center hole; round stick-type density bars inserted into corresponding through-holes of the body and made of materials each with different densities; an acrylic cover detachably coupled with both ends of the body and having the same diameter as the body; and a plurality of bolts closely fastening the body with the cover by extending through the cover and the body and coupling with the nuts and each made of different materials. The cross-sectional shapes of the density bars and bolts appear on the image scanned by the CT apparatus and the radiotherapy apparatus.Type: GrantFiled: January 6, 2009Date of Patent: July 13, 2010Assignee: Catholic University Industry Academic Cooperation FoundationInventors: Hong Seok Jang, Hoi Nam Kim, Tae Suk Suh, Ji Na Chang, Seoung Jong Oh, Won Kyun Jung, Teak Kwon Kim
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Publication number: 20090190723Abstract: A calibration phantom for quality assurance of an image-based radiotherapy apparatus The calibration phantom includes a body comprising a cylindrical acryl member having a predetermined diameter, the body having a center hole at a center axis thereof and a plurality of through-holes in outer circumferential portions thereof at a predetermined interval from the center hole; round stick-type density bars inserted into corresponding through-holes of the body and made of materials each with different densities; an acrylic cover detachably coupled with both ends of the body and having the same diameter as the body; and a plurality of bolts closely fastening the body with the cover by extending through the cover and the body and coupling with the nuts and each made of different materials. The cross-sectional shapes of the density bars and bolts appear on the image scanned by the CT apparatus and the radiotherapy apparatus.Type: ApplicationFiled: January 6, 2009Publication date: July 30, 2009Inventors: Hong Seok Jang, HoI Nam Kim, Tae Suk Suh, Ji Na Chang, Seoung Jong Oh, Won Kyun Jung, Teak Kwon Kim
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Patent number: 6946784Abstract: The present invention is to provide an electron gun of a monochromic CRT comprising at least two electron emission sources (e.g., cathodes) for emitting beams having a small beam spot size and being adapted to impinge on the same spot of a screen of the monochromic CRT after having been focused by a focusing lens or common lens in the electron gun. As an end, the resolution, focusing quality and brightness of the screen of the monochromic CRT are improved.Type: GrantFiled: May 14, 2003Date of Patent: September 20, 2005Assignee: Chunghwa Picture Tubes, Ltd.Inventors: Chi-Neng Mo, Pei-Kuang Lin, Yung-Wei Yang, Li-Na Chang
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Publication number: 20050037134Abstract: The invention relates to a process of manufacturing micronized oxide cathode comprising the steps of performing a micronized attrition on a cathode material for oxide cathode manufacture in order to decrease an average diameter of particles of a conventional cathode material from the order of micron (e.g., about 2.0 ?m) to the order of sub-micron (e.g., about 0.09 ?m to 1 ?m), coating the cathode material on a cathode substrate, and heating the cathode substrate in a vacuum environment for producing a micronized oxide cathode able to increase the area of hot electron emission on the surface thereof, increase the pore conduction mechanism on the oxide, and effectively improve the hot electron emission properties of the oxide cathode.Type: ApplicationFiled: August 12, 2003Publication date: February 17, 2005Applicant: CHUNGHWA PICTURE TUBES, LTD.Inventors: Mei Liu, Chi Mo, Pei Lin, Li-Na Chang, Yung Yang
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Publication number: 20040227448Abstract: The present invention is to provide an electron gun of a monochromic CRT comprising at least two electron emission sources (e.g., cathodes) for emitting beams having a small beam spot size and being adapted to impinge on the same spot of a screen of the monochromic CRT after having been focused by a focusing lens or common lens in the electron gun. As an end, the resolution, focusing quality and brightness of the screen of the monochromic CRT are improved.Type: ApplicationFiled: May 14, 2003Publication date: November 18, 2004Applicant: CHUNGHWA PICTURE TUBES, LTD.Inventors: Chi-Neng Mo, Pei-Kuang Lin, Yung-Wei Yang, Li-Na Chang
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Patent number: 6176652Abstract: A drilling machine primarily employed in drilling holes in a glass plate comprises a vacuum suction table for putting a glass plate thereon, a plurality of fasteners to fasten vacuum suction table on the glass plate, an adjusting screw for precisely positioning drill seat to above a desired position, a motor drive to provide a power for enabling drill to move downwardly to drill, and a lubricating device for feeding lubricating oil on drill during operation for decreasing drill temperature and dust occurred. With the drilling machine, a quality product with high precision as well as increasing efficiency and safety are realized.Type: GrantFiled: July 8, 1999Date of Patent: January 23, 2001Assignee: Chunghwa Picture Tubes, Ltd.Inventors: Huo-Chen Tsai, Shih-Chung Chang, Wen-Chih Sung, Li-Na Chang