Patents Assigned to AAF International
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Patent number: 6409864Abstract: A pleat filter medium assembly and method of making the same wherein pleated fibrous filter medium forming troughs between opposed faces of adjacent filter medium pleats serve to include spacer inserts formed from intersecting sets of spaced strands of different cross-sectional thickness.Type: GrantFiled: February 3, 2000Date of Patent: June 25, 2002Assignee: AAF International, Inc.Inventor: Kyung-Ju Choi
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Patent number: 6398839Abstract: A self supporting pleated fluid filter medium having different fibers to provide pleats sufficiently self supporting to maintain pleated form during fluid filter treatment, the invention further including low melt fiber and an optional support frame and a method of making such pleated filter.Type: GrantFiled: April 24, 2001Date of Patent: June 4, 2002Assignee: AAF InternationalInventors: Kyung-Ju Choi, Dennis R. Porter, Ronald E. Braswell
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Publication number: 20010036890Abstract: A self supporting pleated fluid filter medium having different fibers to provide pleats sufficiently self supporting to maintain pleated form during fluid filter treatment, the invention further including low melt fiber and an optional support frame and a method of making such pleated filter.Type: ApplicationFiled: April 24, 2001Publication date: November 1, 2001Applicant: AAF INTERNATIONALInventors: Kyung-Ju Choi, Dennis R. Porter, Ronald E. Braswell
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Publication number: 20010032446Abstract: A self supporting pleated fluid filter medium having different fibers to provide pleats sufficiently self supporting to maintain pleated form during fluid filter treatment, the invention fixer including low melt fiber and an optional support frame and a method of making such pleated filter.Type: ApplicationFiled: April 24, 2001Publication date: October 25, 2001Applicant: AAF INTERNATIONALInventors: Kyung-Ju Choi, Dennis R. Porter, Ronald E. Braswell
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Patent number: 6267832Abstract: A method and apparatus for continuously manufacturing filter units; each unit including a flow-through filter medium support frame with at least one sheet of filter medium extending across the flow-through opening of each unit with the edges thereof welded to the peripheral side edges of the unit frame.Type: GrantFiled: August 11, 1999Date of Patent: July 31, 2001Assignee: AAF InternationalInventor: Kyung-Ju Choi
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Patent number: 6254476Abstract: In a fan for circulating an air stream in an air-treating environment, an improved fan blade structure designed to optimize airflow along the rotational axis of the fan blade within an optimized low decibel sound range and at preselected revolutions per minute.Type: GrantFiled: October 8, 1999Date of Patent: July 3, 2001Assignee: AAF International, Inc.Inventor: Kyung-Ju Choi
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Patent number: 6254653Abstract: A self supporting pleated fluid filter medium having different fibers to provide pleats sufficiently self supporting to maintain pleated form during fluid filter treatment, the invention further including low melt fiber and an optional support frame and a method of making such pleated filter.Type: GrantFiled: October 8, 1999Date of Patent: July 3, 2001Assignee: AAF InternationalInventors: Kyung-Ju Choi, Dennis R. Porter, Ronald E. Braswell
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Patent number: 6230776Abstract: A method, apparatus and filter unit product wherein filter media fibers are fed from a media supply source to a mat forming interchangeable and movable contoured surface to contour shape a filter media mat into a preselected form for subsequent movement to a transfer zone for further contour shaping and processing into filter unit products with preselected frame arrangements.Type: GrantFiled: October 26, 2000Date of Patent: May 15, 2001Assignee: AAF International, Inc.Inventor: Kyung-Ju Choi
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Patent number: 6165242Abstract: A pleated filter and method of making the same wherein the crests of pleated filter medium include nesting daubs of pleat spreading and pleat maintaining material located at the crests to define free flow valleys between opposed pleat faces for efficient passage of a fluid stream to be treated therethrough from upstream through downstream pleat faces.Type: GrantFiled: March 27, 1999Date of Patent: December 26, 2000Assignee: AAF International, INCInventor: Kyung-Ju Choi
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Patent number: 6165241Abstract: A pleat filter arrangement and method of making the same wherein longitudinally extending sheets of filter media are pleated to include pliable strips adhesively extending between at least one face of the opposed pleat faces to separate the opposed pleat faces so as to allow fluid flow therethrough, the pleated filter media being cut to size as pleated filter medium units and framed.Type: GrantFiled: March 27, 1999Date of Patent: December 26, 2000Assignee: AAF International, Inc.Inventor: Kyung-Ju Choi
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Patent number: 6165244Abstract: A filter including a fibrous filter medium mat, having an upstream dirty fluid inlet and a downstream clean fluid outlet, with a majority of the filter medium fibers oriented in a substantially unrestrained, aligned direction so as to be aligned with the direction of fluid stream flow, the fibrous filter medium mat combinable in a preselected manner with filter media of randomly dispersed fibers.Type: GrantFiled: March 13, 1999Date of Patent: December 26, 2000Assignee: AAF International, Inc.Inventor: Kyung-Ju Choi
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Patent number: 6159318Abstract: A method, apparatus and filter unit product wherein filter media fibers are fed from a media supply source to a mat forming interchangeable and movable contoured surface to contour shape a filter media mat into a preselected form for subsequent movement to a transfer zone for further contour shaping and processing into filter unit products with preselected frame arrangements.Type: GrantFiled: October 21, 1998Date of Patent: December 12, 2000Assignee: AAF International, Inc.Inventor: Kyung-Ju Choi
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Patent number: 6045597Abstract: A pleat filter medium assembly wherein pleated fibrous filter medium forming troughs between opposed faces of adjacent filter medium pleats serve to include spacer inserts formed from intersecting sets of spaced strands of different cross-sectional thickness.Type: GrantFiled: June 22, 1998Date of Patent: April 4, 2000Assignee: AAF International Inc.Inventor: Kyung-Ju Choi
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Patent number: 6033454Abstract: An air filter has a generally rectangular frame having surfaces defining generally a plane, and a pair of parallel side rails and a pair of parallel end rails along outer edges of the plane-defining surfaces, the rails flaring outboardly at an obtuse angle from the plane when the frame is unconfined, one of the rails at each corner of the rectangular frame being provided with tabs, and the other, contiguous of the rails at the corner having an open end into which the tab extends. The tabs have an angled outer surface and are of a length compared with the height of the open end to be held against movement clear of the open end in every position of the rails when the frame is assembled, to limit the outward flare of the rails and to ensure that the corners of the rails are substantially closed in every position of the rails.Type: GrantFiled: July 13, 1998Date of Patent: March 7, 2000Assignee: AAF InternationalInventor: Russell W. Hoeffken
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Patent number: 6022305Abstract: A system for pleating a continuous strip of foldable material including feeding the strip of foldable material between adjacent flights of cooperatively positioned endless conveyors having pleat folding arms pivotally associated therewith which are alternatively and interfittingly positioned to pleat the strip of foldable material as it movingly passes from one end of adjacent flights to the other end thereof.Type: GrantFiled: March 11, 1998Date of Patent: February 8, 2000Assignee: AAF InternationalInventors: Kyung-Ju Choi, Brian K. Baer
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Patent number: 5976209Abstract: A product wherein a layered web of melt blown fibrous filter media is produced by a unitary die including several die sources with facing layers of the fibrous filter media being attenuated by opposed fluid streams at preselected included angles and with the fiber layers being free from bonding together and with the fibers in each layer being minimally bonded.Type: GrantFiled: November 18, 1998Date of Patent: November 2, 1999Assignee: AAF InternationalInventor: Kyung-Ju Choi
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Patent number: 5976427Abstract: A method, die apparatus and product wherein a layered web of melt blown fibrous filter media is produced by a unitary die including several die sources with facing layers of the fibrous filter media being attenuated by opposed fluid streams at preselected included angles and with the fiber layers being free from bonding together and with the fibers in each layer being minimally bonded.Type: GrantFiled: November 18, 1998Date of Patent: November 2, 1999Assignee: AAF InternationalInventor: Kyung-Ju Choi
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Patent number: 5968373Abstract: A filter apparatus and method wherein successive layers of filter medium are spaced apart from each other a preselected distance to create a substantially direct, in-line through-flow void space therebetween evaluated upon the porosity and thickness of the successive filter mediums, pleated spacer/filter arrangements being employed to create a combined overall filter media with an included through-flow void space for fractionated distribution of particles between the successive layers of filter medium to maximize particulate holding capacity of the overall filter media.Type: GrantFiled: December 22, 1997Date of Patent: October 19, 1999Assignee: AAF InternationalInventor: Kyung-Ju Choi
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Patent number: 5928396Abstract: A filter bag assembly and method and machinery to form the same wherein spaced opposed filter bag panels are connected together by transversely extending preselectively sized binder strips fastened selectively at opposed ends to the spaced filter panels to restrain outward inflation of the filter bag.Type: GrantFiled: December 31, 1997Date of Patent: July 27, 1999Assignee: AAF InternationalInventor: Kyung-Ju Choi
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Patent number: 5891482Abstract: A die apparatus wherein a layered web of melt blown fibrous filter media is produced by a unitary die including several die sources with facing layers of the fibrous filter media being attenuated by opposed fluid streams at preselected included angles and with the fiber layers being free from bonding together and with the fibers in each layer being minimally bonded.Type: GrantFiled: July 8, 1996Date of Patent: April 6, 1999Assignee: AAF InternationalInventor: Kyung-Ju Choi