Patents by Inventor Huifen Li
Huifen Li 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: 10793472Abstract: The present invention provides a composition, a gypsum board and their preparation method and the use of ascorbic acid as an anti-sagging additive in a gypsum board. Said gypsum board comprises set gypsum prepared from the composition; while said composition comprises hemi-hydrate gypsum, water and a compound comprising group and no carboxylate groups. The set gypsum prepared from the said composition shows better anti-sagging or deformation resisting property. The gypsum board of the present invention is hardly distorted and has stronger stability even in the condition of high humidity, thus improve the quality of the gypsum board to meet the demands of the customer.Type: GrantFiled: December 3, 2012Date of Patent: October 6, 2020Assignee: SAINT-GOBAIN PLACOInventors: Xiaotong Gao, Huifen Li, Hao Song, Ke Zhang
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Patent number: 9133060Abstract: The present invention provides a gypsum composition, a gypsum board and their preparation method and the use of DHA as an anti-sagging additive in a gypsum product. Said gypsum board comprises set gypsum prepared from the composition; while said composition comprises gypsum, and an anti-deformation additive, wherein the anti-deformation additive comprises at least one selected from a group consisting of dehydroascorbic acid, dehydroascorbate and semidehydroascorbic acid. The set gypsum prepared from the said composition shows better anti-sagging or deformation resisting property. The gypsum product of the present invention is hardly distorted and has stronger stability even in the condition of high humidity, thus improve the quality of the gypsum product to meet the demands of the customer.Type: GrantFiled: December 3, 2012Date of Patent: September 15, 2015Assignee: Saint-Gobain PlacoInventors: Xiaotong Gao, Dongxiao Shao, Huifen Li, Hao Song, Ke Zhang
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Patent number: 8958063Abstract: An illumination device for providing near isotropic illumination, and particularly an illumination system for detecting the defect in a transparent substrate and a detection system including the same are presented. An illumination system includes: an illumination system for detecting the defect in a transparent substrate, including light source receptacle in bar shape; first spot light sources, each emitting a respective first light, the respective first lights being substantially parallel to each other and the first spot light sources being arranged to a first line of spot light sources along the longitudinal direction of the receptacle; and second spot light sources, each emitting a respective second light, the respective second lights being substantially parallel to each other and the second spot light sources being arranged to a second line of spot light sources along the longitudinal direction of the receptacle.Type: GrantFiled: December 31, 2011Date of Patent: February 17, 2015Assignee: Saint-Gobain Glass FranceInventors: Xiaofeng Guo, Huifen Li, Xiaofeng Lin, Xiaowei Sun, Wenhua Deng
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Publication number: 20150007753Abstract: The present invention provides a gypsum composition, a gypsum board and their preparation method and the use of DHA as an anti-sagging additive in a gypsum product. Said gypsum board comprises set gypsum prepared from the composition; while said composition comprises gypsum, and an anti-deformation additive, wherein the anti-deformation additive comprises at least one selected from a group consisting of dehydroascorbic acid, dehydroascorbate and semidehydroascorbic acid. The set gypsum prepared from the said composition shows better anti-sagging or deformation resisting property. The gypsum product of the present invention is hardly distorted and has stronger stability even in the condition of high humidity, thus improve the quality of the gypsum product to meet the demands of the customer.Type: ApplicationFiled: December 3, 2012Publication date: January 8, 2015Applicant: SAINT-GOBAIN PLACOInventors: Xiaotong Gao, Dongxiao Shao, Huifen Li, Hao Song, Ke Zhang
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Publication number: 20150011138Abstract: The present invention provides a composition, a gypsum board and their preparation method and the use of ascorbic acid as an anti-sagging additive in a gypsum board. Said gypsum board comprises set gypsum prepared from the composition; while said composition comprises hemi-hydrate gypsum, water and a compound comprising group and no carboxylate groups. The set gypsum prepared from the said composition shows better anti-sagging or deformation resisting property. The gypsum board of the present invention is hardly distorted and has stronger stability even in the condition of high humidity, thus improve the quality of the gypsum board to meet the demands of the customer.Type: ApplicationFiled: December 3, 2012Publication date: January 8, 2015Applicant: SAINT-GOBAIN PLACOInventors: Xiaotong Gao, Huifen Li, Hao Song, Ke Zhang
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Publication number: 20140347657Abstract: An illumination device for providing near isotropic illumination, and particularly an illumination system for detecting the defect in a transparent substrate and a detection system including the same are presented, An illumination system includes: an illumination system for detecting the defect in a transparent substrate, including light source receptacle in bar shape; first spot light sources, each emitting a respective first light, the respective first lights being substantially parallel to each other and the first spot light sources being arranged to a first line of spot light sources along the longitudinal direction of the receptacle; and second spot light sources, each emitting a respective second light, the respective second lights being substantially parallel to each other and the second spot light sources being arranged to a second line of spot light sources along the longitudinal direction of the receptacle.Type: ApplicationFiled: December 31, 2011Publication date: November 27, 2014Applicant: SAINT-GOBAIN GLASS FRANCEInventors: Xiaofeng Guo, Huifen Li, Xiaofeng Lin, Xiaowei Sun, Wenhua Deng
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Publication number: 20120133762Abstract: A method and system for detecting and classifying a defect of a substrate, the system including a first channel, including a first illuminating unit to irradiate a light to a substrate and a first imaging unit to take images by sensing a light from the substrate when it is irradiated; a second channel, including a second illuminating unit to irradiate a light to the substrate and a second imaging unit to take images by sensing a light from the substrate when it is irradiated; an image constructing module to construct two images of the substrate using the images of the first and second imaging units respectively; and an image processing module to detect, when the substrate has a defect, that the defect is a defect on or in the substrate, based on a relationship of positions where the defect of the substrate appears in the two images of the substrate.Type: ApplicationFiled: February 26, 2010Publication date: May 31, 2012Applicant: SAINT-GOBAIN GLASS FRANCEInventors: Jean-Philippe Schweitzer, Huifen Li, Xiaofeng Lin, Xiaofeng Guo, Feng Guo, Xiaowei Sun
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Publication number: 20120105624Abstract: An apparatus and a method for detecting a defect of a separated low rigidity transparent or translucent body, wherein an image acquiring device includes: a first conveyer and a second conveyer to convey a separated low rigidity transparent or translucent body; a transparent bridge disposed between a first conveyer and a second conveyer along a transport path of the separated low rigidity transparent or translucent body, the transparent bridge having a top surface; an illuminating unit disposed on one side of the transparent bridge and configured to project diffusive light onto the top surface of the transparent bridge by transmitting through the transparent bridge; and an image pickup unit disposed on the other side of the transparent bridge and configured to receive light projected from the illuminating unit and transmitting through the separated low rigidity transparent or translucent body to form an image when the separated low rigidity transparent or translucent body enters the top surface of the transparType: ApplicationFiled: July 2, 2010Publication date: May 3, 2012Applicant: Saint-Gobain Glass FranceInventors: Xiaofeng Lin, Jean-Philippe Schweitzer, Huifen Li, Wenhua Deng, Haifeng Chen, Dazhi Chen
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Publication number: 20110310244Abstract: A system and a method for detecting defects of a substrate are provided. The system includes: a first illuminating component, disposed at one side of the substrate and adapted to emit diffused light to the substrate; a first imaging component, disposed at the other side of the substrate and adapted to scan the substrate by sensing light emitted by the first illuminating component and transmitted through the substrate, the first illuminating component and the first imaging component constructing a first detection channel; and a transport module, adapted to produce relative motion between the substrate, and the first illuminating component and the first imaging component.Type: ApplicationFiled: February 26, 2010Publication date: December 22, 2011Applicant: SAINT-GOBAIN GLASS FRANCEInventors: Jean-Philippe Schweitzer, Huifen Li, Xiaofeng Lin, Feng Guo, Xiaofeng Guo
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Patent number: 7619749Abstract: Ultra-precision freeform surfaces are important to the development of complex and micro-optical-electro-mechanical devices used in many photonics and telecommunication products such as F-theta lenses for laser printers. These surfaces are complex and large scale surface topologies with shapes that generally possesses no rotational symmetry. Due to the geometrical complexities of these ultra-precision freeform surfaces, it is difficult to characterize the form accuracy and surface quality of freeform optical surfaces.Type: GrantFiled: August 29, 2006Date of Patent: November 17, 2009Assignee: The Hong Kong Polytechnic UniversityInventors: Chi-Fai Cheung, Huifen Li, Wing-Bun Lee, Suet To, Lingbao Kong
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Publication number: 20070195084Abstract: Ultra-precision freeform surfaces are important to the development of complex and micro-optical-electro-mechanical devices used in many photonics and telecommunication products such as F-theta lenses for laser printers. These surfaces are complex and large scale surface topologies with shapes that generally possesses no rotational symmetry. Due to the geometrical complexities of these ultra-precision freeform surfaces, it is difficult to characterize the form accuracy and surface quality of freeform optical surfaces.Type: ApplicationFiled: August 29, 2006Publication date: August 23, 2007Inventors: Chi-Fai Cheung, Huifen Li, Wing-Bun Lee, Suet To, Lingbao Kong