Patents by Inventor Cheng-Hang Chi
Cheng-Hang Chi 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: 8679217Abstract: A filter including a filter medium with a pleated structure. The medium includes a nanoweb layer and a scrim, wherein the nanoweb layer contains fibers with a number average diameter less than 1 micron and layer thickness less than 50 microns. The ratio of total medium thickness-to-pleat spacing is less than 0.15 and the nanoweb layer has a basis weight of more than about 0.6 gsm. The nonwoven scrim can be a spunbond web, a dry-laid web, a wet-laid web, a cellulose fiber web, a melt blown web and a glass fiber web.Type: GrantFiled: September 7, 2007Date of Patent: March 25, 2014Assignee: E I du Pont de Nemours and CompanyInventors: Cheng-Hang Chi, Hyun Sung Lim
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Patent number: 8652230Abstract: A filter fabric having improved filtering properties for hot gas filtration containing a nonwoven aramid mat The mat has a basis weight of at least 9.7 ounces per square yard (330 grams per square meter) and is characterized by a pore size distribution in which the number of pores in a given range as measured by ASTM F316-03 test method is plotted against pore size. In a preferred embodiment, the percentage of pores having a size in between 10 and 26 microns is greater than 50% while the percentage of pores having a size of greater than 50 microns is less than 0.5%.Type: GrantFiled: December 8, 2011Date of Patent: February 18, 2014Assignee: E I du Pont de Nemours and CompanyInventors: Kurt Hans Wyss, Cheng-Hang Chi
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Patent number: 8636833Abstract: A method for filtering particles from water mist laden air involves passing the air through a medium that has a nanoweb layer in fluid contact with a hydrophobic nonwoven web. The hydrophobic web can be made of an intrinsically hydrophobic material, or can be coated with a hydrophobic coating. The medium does not undergo the large pressure drops normally associated with filtration of water mists and retains its efficiency well.Type: GrantFiled: September 9, 2010Date of Patent: January 28, 2014Assignee: E I du Pont de Nemours and CompanyInventors: David Charles Jones, Hyun Sung Lim, Cheng-Hang Chi, Lu Zhang
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Patent number: 8361180Abstract: A filter media comprising a nanofiber layer and a substrate layer; the nanofiber layer comprising a polymer material and having a fiber diameter of about 0.01 to 1.0 micron, a basis weight of about 0.5 to 30 gsm, and a thickness of at least about 2 microns, the nanofiber layer further having a surface stability index of at least about 5 kN/m, the media further being pleated.Type: GrantFiled: November 26, 2007Date of Patent: January 29, 2013Assignee: E I du Pont de Nemours and CompanyInventors: Hyun Sung Lim, Cheng Hang Chi
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Publication number: 20120318136Abstract: A nonwoven felt for hot gas filtration. The fibers have a polyarylene sulfide (PAS) component that contains a zinc compound. In one embodiment, the PAS comprises at least one zinc(II) salt of an organic carboxylic acid. Also a method for filtering hot gases employing a bag made from a PAS component that contains a zinc or a zinc based additive.Type: ApplicationFiled: June 15, 2011Publication date: December 20, 2012Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: ROBERT JOHN DUFF, Zheng-Zheng Jenny Huang, Lakshmi Krishnamurthy, Rakesh Nambiar, Joel M. Pollino, Joachim C. Ritter, Harry Vaughn Samuelson, Cheng-Hang Chi
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Publication number: 20120312810Abstract: A susceptor assembly comprises a generally planar susceptor having an electric field director structure mechanically connected thereto. The field director structure includes at least one, but more preferably, a plurality of two or more vanes mechanically connected to the susceptor. Each vane has a surface at least a portion of which is electrically conductive. The vane(s) are most preferably disposed substantially orthogonal to the planar susceptor. The connection may be either a fixed or a flexible articulating connection. In use, such as in the presence of a standing electromagnetic wave generated within a microwave oven, only an attenuated electric field component of the electromagnetic wave exists in a plane tangent to the surface of the vane in the vicinity of the conductive portion of the vane.Type: ApplicationFiled: June 15, 2012Publication date: December 13, 2012Applicant: E I DU PONT DE NEMOURS AND COMPANYInventors: Nicole L. Blankenbeckler, Cheng-Hang Chi, Mehrdad Mehdizadeh, Ronald Jack Riegert
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Publication number: 20120311977Abstract: A filter fabric having improved filtering properties for hot gas filtration containing a nonwoven aramid mat The mat has a basis weight of at least 9.7 ounces per square yard (330 grams per square meter) and is characterized by a pore size distribution in which the number of pores in a given range as measured by ASTM F316-03 test method is plotted against pore size. In a preferred embodiment, the percentage of pores having a size in between 10 and 26 microns is greater than 50% while the percentage of pores having a size of greater than 50 microns is less than 0.5%.Type: ApplicationFiled: December 8, 2011Publication date: December 13, 2012Applicant: E.I. DU PONT DE NEMOURS AND COMPANYInventors: Kurt Hans Wyss, Cheng-Hang Chi
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Patent number: 8282712Abstract: A filtration medium is disclosed for use in air filters used in heating, ventilating and air conditioning systems. The medium contains at least one nanofiber layer of fibers having diameters less than 1 ?m and at least one upstream layer, the medium having sufficient holding capacity for dust particles that efficiency loss and pressure loss across the medium are minimized during use.Type: GrantFiled: April 6, 2009Date of Patent: October 9, 2012Assignee: E I du Pont de Nemours and CompanyInventors: Cheng-Hang Chi, Hyun Sung Lim, Lu Zhang
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Patent number: 8217324Abstract: A susceptor assembly includes a generally planar susceptor having an electric field director structure mechanically connected thereto. The field director structure includes at least one, but more preferably, a plurality of two or more vanes mechanically connected to the susceptor. Each vane has a surface at least a portion of which is electrically conductive. The vane(s) are most preferably disposed substantially orthogonal to the planar susceptor. The connection may be either a fixed or a flexible articulating connection. In use, such as in the presence of a standing electromagnetic wave generated within a microwave oven, only an attenuated electric field component of the electromagnetic wave exists in a plane tangent to the surface of the vane in the vicinity of the conductive portion of the vane.Type: GrantFiled: August 29, 2006Date of Patent: July 10, 2012Assignee: E. I. du Pont de Nemours and CompanyInventors: Cheng-Hang Chi, Nicole L. Blankenbeckler, Mehrdad Mehdizadeh, Ronald Jack Riegert
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Publication number: 20110214570Abstract: A method for filtering particles from water mist laden air involves passing the air through a medium that has a nanoweb layer in fluid contact with a hydrophobic nonwoven web. The hydrophobic web can be made of an intrinsically hydrophobic material, or can be coated with a hydrophobic coating. The medium does not undergo the large pressure drops normally associated with filtration of water mists and retains its efficiency well.Type: ApplicationFiled: September 9, 2010Publication date: September 8, 2011Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: David Charles Jones, Hyun Sung Lim, Cheng-Hang Chi, Lu Zhang
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Publication number: 20100139224Abstract: A filter media for filtering particulates from air or other gases contains a membrane, and a depth filtration layer upstream and in fluid contact with the membrane. The depth filtration layer contains a nanoweb layer and a prefiltration layer upstream of and in fluid communication with the nanoweb layer. The prefiltration layer may be a nonwoven, and in one embodiment, specifically a melt blown nonwoven which may also be charged.Type: ApplicationFiled: December 7, 2009Publication date: June 10, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Hyun Sung Lim, Cheng-Hang Chi
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Publication number: 20090249956Abstract: A filtration medium is disclosed for use in air filters used in heating, ventilating and air conditioning systems. The medium contains at least one nanofiber layer of fibers having diameters less than 1 ?m and at least one upstream layer, the medium having sufficient holding capacity for dust particles that efficiency loss and pressure loss across the medium are minimized during use.Type: ApplicationFiled: April 6, 2009Publication date: October 8, 2009Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: CHENG-HANG CHI, Hyun Sung Lim, Lu Zhang
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Publication number: 20090064648Abstract: A filter including a filter medium with a pleated structure. The medium includes a nanoweb layer and a scrim, wherein the nanoweb layer contains fibers with a number average diameter less than 1 micron and layer thickness less than 50 microns. The ratio of total medium thickness-to-pleat spacing is less than 0.15 and the nanoweb layer has a basis weight of more than about 0.6 gsm. The nonwoven scrim can be a spunbond web, a dry-laid web, a wet-laid web, a cellulose fiber web, a melt blown web and a glass fiber web.Type: ApplicationFiled: September 7, 2007Publication date: March 12, 2009Inventors: Cheng-Hang Chi, Hyun Sung Lim
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Publication number: 20080134652Abstract: A filter media comprising a nanofiber layer and a substrate layer; the nanofiber layer comprising a polymer material and having a fiber diameter of about 0.01 to 1.0 micron, a basis weight of about 0.5 to 30 gsm, and a thickness of at least about 2 microns, the nanofiber layer further having a surface stability index of at least about 5 kN/m, the media further being pleated.Type: ApplicationFiled: November 26, 2007Publication date: June 12, 2008Inventors: Hyun Sung Lim, Cheng Hang Chi
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Publication number: 20070187399Abstract: A susceptor assembly comprises a generally planar susceptor having an electric field director structure mechanically connected thereto. The field director structure includes at least one, but more preferably, a plurality of two or more vanes mechanically connected to the susceptor. Each vane has a surface at least a portion of which is electrically conductive. The vane(s) are most preferably disposed substantially orthogonal to the planar susceptor. The connection may be either a fixed or a flexible articulating connection. In use, such as in the presence of a standing electromagnetic wave generated within a microwave oven, only an attenuated electric field component of the electromagnetic wave exists in a plane tangent to the surface of the vane in the vicinity of the conductive portion of the vane.Type: ApplicationFiled: August 29, 2006Publication date: August 16, 2007Inventors: Nicole Blankenbeckler, Cheng-Hang Chi, Mehrdad Mehdizadeh, Ronald Riegert
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Publication number: 20050142255Abstract: The present invention is directed to a method of heating a food, comprising the step of imparting microwave energy to a food wherein a portion of the microwave energy is converted to heat by use of a coating derived from an ink comprising natural polymer binder, substantially non-aggregated particulate nonmetallic microwave susceptor material, an aqueous solvent for the natural polymer binder, and, optionally, a chemical dispersing aid. The food is heated, and preferably browned, without the occurrence of electrical arcs that would burn the food or damage the oven.Type: ApplicationFiled: December 31, 2003Publication date: June 30, 2005Inventors: Nicole Blankenbeckler, Cheng-Hang Chi, Paul Kust
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Publication number: 20040173607Abstract: A microwave susceptor material packaging article or ovenware contains susceptor material which differs in an effectiveness to convert microwave energy to heat.Type: ApplicationFiled: December 31, 2003Publication date: September 9, 2004Inventors: Nicole L. Blankenbeckler, Cheng-Hang Chi
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Publication number: 20040175547Abstract: A microwave susceptor material packaging article or ovenware comprises at least two distinct areas of susceptor materials with an inner susceptor material area and an outer susceptor material area with the inner surface having an ability to convert more microwave energy to heat (on a basis of equal inner and outer surface areas and equal amount of striking microwave energy).Type: ApplicationFiled: December 31, 2003Publication date: September 9, 2004Inventors: Nicole L. Blankenbeckler, Cheng-Hang Chi
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Patent number: 6666235Abstract: A lightweight and durable high-performance denim fabric. More particularly, a lightweight durable denim comprising a high strength component and a natural fiber, which is constructed into a fabric having both about a 15% lighter weight and about 15% higher durability than standard denim.Type: GrantFiled: October 26, 2001Date of Patent: December 23, 2003Assignee: E. I. du Pont de Nemours and CompanyInventors: Cheng-Hang Chi, Larry John Prickett
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Patent number: 6637085Abstract: The present invention is directed to a process for recycling a fabric containing high performance fibers having a tenacity of at least 10 grams per dtex and a tensile modulus of at least 150 grams per dtex, to make a yarn from the fabric. In the process, and the fabric is cut into pieces where the largest dimension is no larger than 15 centimeters. From 30 to 99 weight percent staple fibers are added to the fabric pieces to make a blend and the fibers of the blend are separated and aligned into a sliver, and the sliver is formed into a twisted yarn. This yarn may be used to make a fabric or any other useful article.Type: GrantFiled: October 26, 2001Date of Patent: October 28, 2003Assignee: E. I. du Pont de Nemours and CompanyInventors: Cheng-Hang Chi, Daniel Michael Fischer, Larry John Prickett