Patents by Inventor Chaokang Chu
Chaokang Chu 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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Publication number: 20130035665Abstract: A method of occluding includes imbibing a porous elongate element comprised of ePTFE with a calcium-containing solution. The method also includes delivering, via a delivery catheter, the calcium-imbibed porous elongate element to a target occlusion site. The method further includes administering, after the calcium-imbibed porous elongate element has been completely delivered to the target occlusion site and resides entirely within a volume defined by the target occlusion site, an alginate-containing solution to the target occlusion site.Type: ApplicationFiled: August 2, 2012Publication date: February 7, 2013Inventors: Chaokang Chu, Robert L. Cleek, Edward H. Cully, Jeffrey Duncan, Krzysztof R. Pietrzak, Edward Emil Shaw, Michael J. Vonesh, Eric H. Zacharias
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Publication number: 20070119540Abstract: A friction-reducing abrasion resistant bearing material is described. The material comprises a monolithic, porous polytetrafluoroethylene (ePTFE) having dispersed therein a wear-resistant thermosetting or thermoplastic resin material.Type: ApplicationFiled: November 20, 2006Publication date: May 31, 2007Inventors: Chaokang Chu, James Hanrahan
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Publication number: 20070123652Abstract: A friction-reducing abrasion resistant bearing material is described. The material comprises a monolithic, porous polytetrafluoroethylene (ePTFE) having dispersed therein a wear-resistant thermosetting or thermoplastic resin material.Type: ApplicationFiled: November 20, 2006Publication date: May 31, 2007Inventors: Chaokang Chu, James Hanrahan
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Patent number: 7147378Abstract: A friction-reducing abrasion resistant bearing material is described. The material comprises a monolithic, porous polytetrafluoroethylene (ePTFE) having dispersed therein a wear-resistant thermosetting or thermoplastic resin material.Type: GrantFiled: February 19, 2004Date of Patent: December 12, 2006Assignee: Gore Enterprise Holdings, Inc.Inventors: Chaokang Chu, James R. Hanrahan
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Publication number: 20060084532Abstract: Novel racquet strings and methods for making the same. A polymer cover combined with a low temperature adhesive is provided to the strings. The string of the present invention may employ a conventional string, such as a string having a center core comprising gut or synthetic material such as nylon, and a polymer cover impregnated with low temperature adhesive. The polymer cover covers the string along at least a portion of the length of the string.Type: ApplicationFiled: October 20, 2004Publication date: April 20, 2006Inventors: Chaokang Chu, Dean Gambale
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Publication number: 20050250398Abstract: A sealing material is presented which can be applied to surfaces and/or to surfaces having seams, cracks, crevices and the like to hinder growth and colonization of bacteria while maintaining adhesion over a wide range of service, or use, conditions. The sealing material includes a fluoropolymer layer, a reinforcing layer and an adhesive for adhering the sealing material to the surface or surfaces to be sealed. The invention combines the inherent anti-stick and hydrophobic properties of fluoropolymers with excellent adhesive characteristics.Type: ApplicationFiled: May 7, 2004Publication date: November 10, 2005Inventors: Malay Patel, Michael Napolitano, James Hanrahan, Chaokang Chu
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Publication number: 20050185867Abstract: A friction-reducing abrasion resistant bearing material is described. The material comprises a monolithic, porous polytetrafluoroethylene (ePTFE) having dispersed therein a wear-resistant thermosetting or thermoplastic resin material.Type: ApplicationFiled: February 19, 2004Publication date: August 25, 2005Inventors: Chaokang Chu, James Hanrahan
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Patent number: 5693694Abstract: A casting solution for preparing a low to medium flux membrane. The casting solution contains 19-25% by weight polysulfone, polyethersulfone, or polyarylsulfone; 14-32% by weight a hydrophilic compatible polymer; 0.1-6% by weight an isocyanate capped polyethylene glycol urethane polymer; and 37-67% by weight an aprotic and water miscible solvent; in which the polysulfone, polyethersulfone, or polyarylsulfone has a M.W. of 10,000-100,000 daltons, the isocyanate capped polymer contains 2-5 --N.dbd.C.dbd.O groups per molecule and has a M.W. of 500-5,000 daltons, and the compatible polymer contains 2-5 --CH.sub.2 OH groups per molecule and has a M.W. of 200-1,000 daltons. Also disclosed are a method of spinning this casting solution to form a hollow fiber and the hollow fiber thus obtained.Type: GrantFiled: March 20, 1996Date of Patent: December 2, 1997Assignee: W.R. Grace & Co.-Conn.Inventors: Chaokang Chu, Joseph F. Ferraro, Ann L. Ly
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Patent number: 5232601Abstract: A morphologically heterogeneous, hydrophobic polysulfone hollow fiber membrane comprising a sponge-like dense inner surface permeable to molecules of less than or equal to 30,000 Daltons, said inner surface having a fraction surface porosity from about 70 to about 80%; and an outer surface having large pores ranging from about 6 to about 16 .mu.m in diameter and small pores less than 500.ANG. in diameter and a fractional surface porosity from about 20 to about 30%; a method for producing same and a hemodialysis treatment method and apparatus incorporating same.Type: GrantFiled: May 29, 1992Date of Patent: August 3, 1993Assignee: W. R. Grace & Co.-Conn.Inventors: Chaokang Chu, Bernard S. Liang, Ann L. Ly
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Patent number: 4986909Abstract: A chromatography column for effecting chromatographic separation of at least two components of a sample flowing through the column. The column comprises a housing and at least one solid stationary phase within the housing. The stationary phase has chromatographic functionality and is effective for chromatographic separation. Means are provided for distributing the sample through the stationary phase and for collecting the sample after the sample has flowed through the stationary phase. The stationary phase comprises:(a) a plurality of layers of swellable fibrous matrix in sheet form having chromatographic functionality and being effective for chromatographic separation; and(b) a spacer means between each layer for permitting controlled swelling thereof and enhancing the distribution of sample flowing through the stationary phase.Type: GrantFiled: July 21, 1989Date of Patent: January 22, 1991Assignee: Cuno IncorporatedInventors: Vish Rai, Nils Dailey, Kenneth Southall, Timothy Webster, Gordon Leeke, Chaokang Chu
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Patent number: 4970034Abstract: Isotropic microporous polysulfone membranes can be prepared by using a particular combination of casting solution and precipitation solution formulations, and casting conditions. Both hollow fiber and flat membranes can be prepared in this manner. The membranes are skinless and are characterized by uniform porosity throughout the membrane.Type: GrantFiled: September 23, 1988Date of Patent: November 13, 1990Assignee: W. R. Grace & Co.-Conn.Inventors: Ann L. Ly, Chaokang Chu, Thanh D. Nguyen
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Patent number: 4915886Abstract: A method is provided of manufacturing a skinless, nylon microporous hollow fiber membrane. The method comprises the steps of providing a nylon polymer dope solution and a quench liquid capable of solidifying and forming micropores in an extruded nylon polymer dope solution to produce a skinless, microporous nylon membrane. The quench liquid is placed into a vessel and a tube is provided which has a top and a bottom outlet. The bottom outlet of the tube is partially submerged in the quench liquid, the tube vertically extending therefrom. A spinneret is provided which has an outlet adjacent the top of the tube. The chemical quench liquid is raised in the tube until it is in substantial contact with the spinneret outlet. The nylon polymer dope solution is extruded in the form of a hollow fiber through the spinneret outlet directly into the quench liquid.Type: GrantFiled: December 20, 1988Date of Patent: April 10, 1990Assignee: Cuno, IncorporatedInventors: Ronald V. Repetti, Scott P. Yaeger, Chaokang Chu
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Patent number: 4820460Abstract: A quench bath, for quenching and solidifying an extruded hollow porous fiber of a liquid polymer solution in a chemical quenching solution, includes a shallow quench bath of a length for the generally horizontal part of the extruded fiber travel in the bath. A vertical extension tube with its lower end beneath the surface of the bath liquid holds a spinneret through which the fiber is extruded. The spinneret is sealed in the tube above the height of the liquid in the shallow bath. A vacuum drawn in the tube raises the liquid up to the spinneret. Also, the vacuum may be drawn by disposing the spinneret in a sealing piston which is raised through the tube to draw the vaccum in the tube behind the piston.Type: GrantFiled: April 27, 1987Date of Patent: April 11, 1989Assignee: CUNO, IncorporatedInventors: Ronald V. Repetti, Scott P. Yaeger, Chaokang Chu
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Patent number: 4743373Abstract: A chromatography column for effecting chromatographic separation of at least two components of a sample flowing through the column. The column comprises a housing and at least one solid stationary phase within the housing. The stationary phase has chromatographic functionality and is effective for chromatographic separation. Means are provided for distributing the sample through the stationary phase and for collecting the sample after the sample has flowed through the stationary phase. The stationary phase comprises:(a) a plurality of layers of swellable fibrous matrix in sheet form having chromatographic functionality and being effective for chromatographic separation; and(b) a spacer means between each layer for permitting controlled swelling thereof and enhancing the distribution of sample flowing through the stationary phase.Type: GrantFiled: September 4, 1986Date of Patent: May 10, 1988Assignee: Cuno IncorporatedInventors: Vish Rai, Nils Dailey, Kenneth Southall, Timothy Webster, Gordon Leeke, Chaokang Chu
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Patent number: 4743418Abstract: A cationic charge modified microporous membrane is provided. The membrane comprises a hydrophilic organic polymeric microporous membrane having bonded thereto, through a cross-linking agent, a charge modifying amount of a cationic charge modifying agent. The charge modifying agent is an aliphatic amine or polyamine, preferably tetraethylene pentamine, and the cross-linking agent is an aliphatic polyepoxide having a molecular weight of less than about 500, preferably 1, 4 butanediol diglycidyl ether. The microporous membrane is preferably nylon. The process for applying the charge modifying agent to the membrane, preferably comprises contacting the membrane with an aqueous solution of the charge modifying agent and then contacting the membrane with a substantially aqueous solution of the cross-linking agent. The preferred process uses high purity water, i.e.Type: GrantFiled: August 17, 1984Date of Patent: May 10, 1988Assignee: Cuno IncorporatedInventors: Robert G. Barnes, Jr., Chaokang Chu, George T. Emond, Asit K. Roy
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Patent number: 4737291Abstract: A cationic charge modified microporous membrane is provided. The membrane comprises a hydrophilic organic polymeric microporous membrane having bonded thereto, through a cross-linking agent, a charge modifying amount of a cationic charge modifying agent. The charge modifying agent is an aliphatic amine or polyamine, preferably tetraethylene pentamine, and the cross-linking agent is an aliphatic polyepoxide having a molecular weight of less than about 500, preferably 1, 4 butanediol diglycidyl ether. The microporous membrane is preferably nylon. The process for applying the charge modifying agent to the membrane, preferably comprises contacting the membrane with an aqueous solution of the charge modifying agent and then contacting the membrane with a substantially aqueous solution of the cross-linking agent. The preferred process uses high purity water, i.e.Type: GrantFiled: August 17, 1984Date of Patent: April 12, 1988Assignee: Cuno IncorporatedInventors: Robert G. Barnes, Jr., Chaokang Chu, George T. Emond, Asit K. Roy
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Patent number: 4704207Abstract: A depth-type filter cartridge comprises an elongated fluid-conducting core, and a plurality of filter cells mounted generally parallel to one another along the length of the core. Fluid to be filtered passes from the exterior into the interior of the cells through a filter medium, and then from the interior of the cells into the core. Support for the filter cells to prevent distortion or damage when used under extreme conditions is provided by external filter cell separators which coact with the cells and are mounted radially about the core between each pair of adjacent cells.Type: GrantFiled: December 2, 1985Date of Patent: November 3, 1987Assignee: Cuno IncorporatedInventor: Chaokang Chu
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Patent number: 4675104Abstract: A chromatography column for effecting chromatographic separation of at least two components of a sample flowing through the column. The column comprises a housing and at least one solid stationary phase within the housing. The stationary phase has chromatographic functionality and is effective for chromatographic separation. Means are provided for distributing the sample through the stationary phase and for collecting the sample after the sample has flowed through the stationary phase. The stationary phase comprises:(a) a plurality of layers of swellable fibrous matrix in sheet form having chromatographic functionality and being effective for chromatographic separation; and(b) a spacer means between each layer for permitting controlled swelling thereof and enhancing the distribution of sample flowing through the stationary phase.Type: GrantFiled: April 16, 1985Date of Patent: June 23, 1987Assignee: Cuno Inc.Inventors: Vish Rai, Kenneth Southall, Timothy Webster, Gordon Leeke, Chaokang Chu
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Patent number: 4606824Abstract: A cellulose-containing separation media for effecting separation of particulate and/or molecular components from a liquid, wherein the cellulose in the separation media is essentially free of non-specific pyrogenic activity as measured by the LAL test. The separation media include filtration media and chromatographic media.Type: GrantFiled: October 26, 1984Date of Patent: August 19, 1986Inventors: Chaokang Chu, Richard A. Babineau
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Patent number: 4604208Abstract: A novel hydrophilic anionic charge modified microporous filter membrane is provided comprising an organic polymeric microporous filter membrane having a micro-structure throughout the membrane and a modifying amount of an anionic charge modifying agent bound to substantially all of the membrane micro-structure without substantial pore size reduction or pore blockage.The invention is further directed to a process for anionically charge modifying an organic polymeric microporous filter membrane by applying to the membrane the charge modifying agent, preferably, by contacting the membrane with a solution of the charge modifying agent.The anionic modified microporous membrane of this invention may be used for the filtration of fluids, particularly parenteral or biological liquids contaminated with charged particulates, and for plasmapheresis, particularly in the form of hollow fiber tubes. The membrane has low extractables and is sanitizable or sterilizable.Type: GrantFiled: December 29, 1983Date of Patent: August 5, 1986Inventors: Chaokang Chu, Joseph V. Fiore, Rodney A. Knight, Paul J. Marinaccio, Asit Roy