Patents Represented by Attorney, Agent or Law Firm Robert H. Hammer, III
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Patent number: 6599319Abstract: A prosthetic ligament includes a cord of thermotropic liquid crystal filaments. The cord preferably comprises multi-filament thermotropic liquid crystal filaments. The cord has an eye spliced at each of its ends.Type: GrantFiled: December 14, 2001Date of Patent: July 29, 2003Assignees: Celanese Advanced Materials, Inc., Cortland Cable Company, Inc.Inventors: Robert B. Knudsen, Richard E. Nye
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Patent number: 6576025Abstract: The instant invention is directed to dyed fabric blends of aramid fibers and flame resistant (FR) cellulosic fibers, which retains a substantial amount of its strength and durability after dyeing. The dyeing process comprises the steps of: providing a fabric comprising a blend of aramid fibers and cellulosic fibers, dyeing the cellulosic fibers of the fabric, and dyeing the aramid fibers of the fabric. Dyeing of the aramid fibers being preformed with low agitation, an aryl ester carrier, and, preferably, at a temperature between 100-110° C.Type: GrantFiled: February 1, 2001Date of Patent: June 10, 2003Assignee: Difco Performance Fabrics, Inc.Inventor: Francois Lapierre
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Patent number: 6558450Abstract: The present invention is directed to a method for debubbling an ink. The method comprises the steps of: providing an ink having an entrained gas; providing a membrane contactor comprising a plurality of integrally asymmetric hollow fiber microporous membranes; a membrane defining within the contactor a lumen side and a shell side; providing a vacuum source; passing the gas entrained ink through the shell side of the contactor; applying the vacuum source to the lumen side of the contactor; and debubbling the gas entrained ink across the membrane.Type: GrantFiled: March 22, 2001Date of Patent: May 6, 2003Assignee: Celgard Inc.Inventors: Amitava Sengupta, Daniel S. Huntsberger, Brian D. Miller
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Patent number: 6539615Abstract: A lug brushing assembly (10) that brushes the lugs of battery plates in an in-line manner so as to eliminate extra battery plate handling procedures. The lug brushing assembly (10) more effectively cleans the lugs of battery plates without causing excessive wearing of the brushes or abrasion on the lugs.Type: GrantFiled: February 12, 2001Date of Patent: April 1, 2003Assignee: Daramic, Inc.Inventor: Galen H. Redden
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Patent number: 6537696Abstract: The preferred embodiment is to a battery separator for a nickel metal hydride (NiMH) battery. The separator includes a wettable, resilient nonwoven web having two spunbond layers sandwiching a melt blown layer. The web has a puncture strength of greater than 6 newtons, a tensile strength of greater than 200 newtons/meter, and an average pore size of less than 20 microns.Type: GrantFiled: December 20, 2000Date of Patent: March 25, 2003Assignee: Daramic, Inc.Inventors: J. Kevin Whear, Joseph G. Yaritz
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Patent number: 6502360Abstract: This invention is directed to a membrane laminate for a roofing system comprising a membrane sheet and a nonwoven material laminated to said sheet. The nonwoven material has a semi-permeable, skinned layer formed therein.Type: GrantFiled: March 27, 2001Date of Patent: January 7, 2003Assignees: Thantex Specialties, Inc., Carlisle Management Co.Inventors: Richard W. Carr, III, Steven R. Clarke, John G. Mitchell
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Patent number: 6503225Abstract: A device (10) for removal of gas bubbles and dissolves gasses from fluids delivered into a patient during medical procedures is disclosed. A housing (20) having a number of gas permeable hollow fibers (50) passing therethrough is provided. The infused fluid is introduced through the interior lumens of the hollow fibers (50), and entrained or dissolved gasses are drawn through the fiber walls to the outer or shell side of the fibers. A vacuum may be drawn on the housing through a vent (32) to enhance gas removal. A passage (70) is optionally provided through the device to allow a tool or other device to be passed therethrough.Type: GrantFiled: October 23, 2000Date of Patent: January 7, 2003Assignee: Celgard Inc.Inventors: Claudia F. E. Kirsch, Bradley W. Reed
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Patent number: 6485867Abstract: The instant invention is directed to the use of lignin in thermoplastics (such as: ultra-high molecular weight polyethylene (UHMWPE)). In the first aspect of the invention, lignins are added to a lead acid battery separator comprising a microporous membrane including an ultra-high molecular weight polyethylene, a filler, and a processing oil. In the second aspect of the invention, lignins are used as a processing aid in thermoplastics.Type: GrantFiled: October 31, 2000Date of Patent: November 26, 2002Assignee: Daramic, Inc.Inventors: Jaime Navarrete, A. Jeff Chapman, Chetan J. Parikh, Roy T. Toomey
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Patent number: 6479190Abstract: The instant invention is directed to a separator for a battery having a zinc electrode. The first embodiment of the separator comprises a microporous membrane and a coating on at least one surface of the membrane. The coating comprises a mixture of cellulose acetate and a surfactant. The surfactant has an active ingredient selected from the group of organic ethers. The second embodiment of the separator consists essentially of a microporous membrane having an effective average pore size of less than 0.045 microns, having a thickness less than 1.5 mils, having an electrical resistance of less or equal to 30 milliohms-inch2, and being adapted for wetting by an aqueous electrolyte.Type: GrantFiled: September 21, 2000Date of Patent: November 12, 2002Assignee: Celgard Inc.Inventor: C. Glen Wensley
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Patent number: 6458185Abstract: A process for the recovery of a volatile organic compound (VOC) from a process stream by use of a bed of activated carbon is disclosed. In the first step, VOC laden gas passes through to the bed, in a first direction. In the second step, steam passes through the bed in a second direction. The first direction is opposite to the second direction. In the final step, cooling gas, ambient atmospheric air, passes through the bed in the second direction. This process yields greater VOC recovery efficiency and longer cycle life for the bed of activated carbon.Type: GrantFiled: March 29, 2001Date of Patent: October 1, 2002Assignee: Celanese Acetate LLCInventors: Timothy D. Reiter, Stephen C. Jones
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Patent number: 6432586Abstract: The instant invention is directed to a separator for a high energy rechargeable lithium battery and the corresponding battery. The separator includes a ceramic composite layer and a polymeric microporous layer. The ceramic layers includes a mixture of inorganic particles and a matrix material. The ceramic layer is adapted, at least, to block dendrite growth and to prevent electronic shorting. The polymeric layer is adapted, at least, to block ionic flow between the anode and the cathode in the event of thermal runaway.Type: GrantFiled: April 10, 2000Date of Patent: August 13, 2002Assignee: Celgard Inc.Inventor: Zhengming Zhang
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Patent number: 6402818Abstract: A membrane contactor degasses a liquid. A liquid having a dissolved gas is introduced into a contactor which is connected to a vacuum source. The contactor has a perforated core, a plurality of hollow fiber membranes, a tube sheet affixing each end of the fibers, and a shell having a liquid egress. The shell encloses the fibers, the tube sheet, and the core. The hollow fiber lumens are in fluid communication with the vacuum source. Liquid enters the contactor via the core's open end radially exits the core, crosses over the membranes within the shell, and exits the contactor by the liquid egress. The dissolved gas thereby diffuses from the liquid across the membrane into the lumen. The liquid exiting may have a dissolved gas content to less than 1 ppb.Type: GrantFiled: June 2, 2000Date of Patent: June 11, 2002Assignee: Celgard Inc.Inventor: Amitava Sengupta
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Patent number: 6368742Abstract: A battery separator is a polypropylene microporous membrane, made from a beta-nucleated precursor, and having an electrical resistance of less than 30 ohms-inches per mil, and a puncture strength of greater than 400 grams-force per mil. mil.Type: GrantFiled: June 26, 1998Date of Patent: April 9, 2002Assignee: Celgard, Inc.Inventors: Harold M. Fisher, C. Glen Wensley
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Patent number: 6350411Abstract: The present invention is to a process for blood oxygenation using a microporous fiber membrane. The use of the hollow fiber allows improvements in plasma break through results. The oxygenator includes a housing and microporous membrane cartridge. The cartridge comprises a microporous hollow fiber membrane having a wall thickness greater than 30 microns and having a bubble point of ≧150 psig.Type: GrantFiled: March 23, 1998Date of Patent: February 26, 2002Assignee: Celgard Inc.Inventors: Kwantai Cho, Clifton James Delozier, Robert English Johnston
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Patent number: 6346350Abstract: A fusible, structurally stabilized battery separator is disclosed. The separator is formed by extruding a cylindrical parison of a polymer film and quenching the film on both sides with a low temperature fluid stream prior to processing the film to impart microporosity. Most preferably, the film includes at least a polyethylene layer and polypropylene layer.Type: GrantFiled: April 20, 1999Date of Patent: February 12, 2002Assignee: Celgard Inc.Inventors: Ronald W. Call, Pierre C. Cook, Shawn E. Hux, Khuy Van Nguyen, Wei-Ching Yu
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Patent number: 6322923Abstract: A battery separator for a gel electrolyte battery includes a microporous membrane; and an adherent coating thereon, or a gel-forming coating thereon, the gel-forming coating including a gel-forming polymer and a plasticizer. The gel-forming polymer is preferably a poly(vinylidene fluoride:hexafluoropropylene) copolymer, and the plasticizer is preferably an ester.Type: GrantFiled: January 30, 1998Date of Patent: November 27, 2001Assignee: Celgard Inc.Inventors: Robert Mark Spotnitz, Charles Glen Wensley
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Patent number: 6299820Abstract: A pressure vessel includes a polyolefin extruded tube, a polyolefin flange overmolded onto the tube, and a cap engaged to the flange. In the overmolding process, a polyolefin material is overmolded unto a polyolefin substrate.Type: GrantFiled: February 16, 1999Date of Patent: October 9, 2001Assignee: Celgard Inc.Inventor: Martin J. Weinstein
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Patent number: 6287730Abstract: The present invention is directed to a hydrophilic polyolefin article comprising a polyolefin article having a coating containing a surfactant and an ethylene vinyl alcohol (EVOH) copolymer.Type: GrantFiled: August 14, 1998Date of Patent: September 11, 2001Assignee: Celgard Inc.Inventors: Robert W. Callahan, Khuy Van Nguyen
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Patent number: 6267926Abstract: An apparatus and method for removing entrained gases from a liquid by directing a liquid flow adjacent a substantially hydrophobic microporous membrane material and providing a negative pressure to one side of the membrane material to draw undissolved gas bubbles out of the liquid and through the membrane walls.Type: GrantFiled: October 8, 1998Date of Patent: July 31, 2001Assignee: Celgard Inc.Inventors: Bradley W. Reed, Martin J. Weinstein
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Patent number: 6207053Abstract: The present invention is directed to a thermoplastic, unibody transfer device. This transfer device includes a membrane, and a housing surrounding the membrane. The housing includes a thermoplastic end cap and a thermoplastic shell. The end cap and shell are butt welded together. Additionally, there is a method of manufacturing with the aforementioned device. The method includes forming a bundle of a membrane, inserting the bundle into a shell, butt welding an end cap to the bundle and the shell so that the cap, bundle, and shell are fused together.Type: GrantFiled: December 7, 1998Date of Patent: March 27, 2001Assignee: Celgard Inc.Inventors: Robert H. Carroll, Linus I. Holstein, Charles J. Runkle, Richard A. Sodaro, Tony R. Vido, Martin J. Weinstein