Patents by Inventor David J. Levitt
David J. Levitt 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: 10286338Abstract: A fluid filtration device is provided that can be used for separating solids from fluids. In some embodiments, the fluid filtration device comprises a hollow housing and a hollow filter assembly located within the housing. Fluid to be filtered is provided to the inside of a filter material in the filter assembly and passes outward toward the housing. In some embodiments one or more flow-directing features are located between the filter assembly and the housing, and may aid in the flow of fluid to a filtered outlet after passing through the filter. The flow-directing features may comprise, for example, channels that extend the length of the filter.Type: GrantFiled: January 9, 2015Date of Patent: May 14, 2019Assignee: Spiral Water Technologies, Inc.Inventor: David J. Levitt
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Patent number: 9895635Abstract: Fluid filtration devices and methods of filtering fluids are described. The devices generally include a housing and an annular filter assembly, wherein the filter assembly is located inside the housing and comprises a filter material. The filter material may be, for example, an electroformed nickel screen having a smooth working surface and expanding pores. A rotating cleaning assembly comprising a distributor and wipers may be located inside the filter assembly.Type: GrantFiled: July 1, 2016Date of Patent: February 20, 2018Assignee: Spiral Water Technologies, Inc.Inventor: David J. Levitt
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Publication number: 20160310877Abstract: Fluid filtration devices and methods of filtering fluids are described. The devices generally include a housing and an annular filter assembly, wherein the filter assembly is located inside the housing and comprises a filter material. The filter material may be, for example, an electroformed nickel screen having a smooth working surface and expanding pores. A rotating cleaning assembly comprising a distributor and wipers may be located inside the filter assembly.Type: ApplicationFiled: July 1, 2016Publication date: October 27, 2016Inventor: David J. Levitt
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Patent number: 9409106Abstract: Fluid filtration devices and methods of filtering fluids are described. The devices generally include a housing and an annular filter assembly, wherein the filter assembly is located inside the housing and comprises a filter material. The filter material may be, for example, an electroformed nickel screen having a smooth working surface and expanding pores. A rotating cleaning assembly comprising a distributor and wipers may be located inside the filter assembly.Type: GrantFiled: March 10, 2011Date of Patent: August 9, 2016Assignee: SPIRAL WATER TECHNOLOGIES, INC.Inventor: David J. Levitt
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Publication number: 20150196859Abstract: A fluid filtration device is provided that can be used for separating solids from fluids. In some embodiments, the fluid filtration device comprises a hollow housing and a hollow filter assembly located within the housing. Fluid to be filtered is provided to the inside of a filter material in the filter assembly and passes outward toward the housing. In some embodiments one or more flow-directing features are located between the filter assembly and the housing, and may aid in the flow of fluid to a filtered outlet after passing through the filter. The flow-directing features may comprise, for example, channels that extend the length of the filter.Type: ApplicationFiled: January 9, 2015Publication date: July 16, 2015Inventor: David J. Levitt
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Patent number: 8882999Abstract: Cleaning assemblies and particulate tolerant fluid bearings that are particularly well suited for use in centrifugal separation enhanced filtration devices are described. In one aspect of the invention, at least one bearing is arranged to carry a circulating cleaning assembly such that the cleaning assembly can rotate around a filter membrane during filtering operation of the filtration device. The bearing is preferably arranged to maintain the circulating cleaning assembly in a substantially coaxial alignment with the filter membrane and in a substantially stable longitudinal position relative to the filter membrane as the circulating cleaning assembly is rotated around the filter membrane. In another aspect of the invention a variety of particulate tolerant bearings are described.Type: GrantFiled: June 17, 2011Date of Patent: November 11, 2014Assignee: Dow Global Technologies LLCInventors: David J. Levitt, George D. Caffell, John H. Mallard, Steven E. O'Reilly
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Publication number: 20140202920Abstract: A container for harvested fruits and vegetables is shown. The container comprises a bottom and sidewalls supported on a base structure. The sidewalls are formed from side structures. The bottom may be integrally formed with a side structure. A rim and rib may be integrally formed in a side structure. The base structure comprises a slot or pocket that may be integrally formed from a side structure. The slot or pocket may be configured for engagement with a lifting apparatus for the container (e.g. forks of a fork lift). The base structure may comprise a bracket. The bracket of the base structure may be configured to facilitate stacking of one container securely on the rim of another container.Type: ApplicationFiled: January 21, 2014Publication date: July 24, 2014Applicant: Hudsonville Products LLCInventors: David J. Levitt, Benjamin A. DOZEMAN
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Patent number: 8701896Abstract: A variety of improved hydroclone based fluid filtering systems are described. The hydroclones generally include a tank having an internal chamber and a filter (preferably a surface filter) that is positioned within the internal chamber. The filter defines a filtered fluid chamber within the internal chamber of the tank. The hydroclone may be operated such that a vortex of flowing fluid is formed between the chamber wall and the filter with the filter being located in the center of the vortex. With this arrangement, the filter acts as a cross-flow filter. In one aspect of the invention, a circulating cleaning assembly is provided in the hydroclone region. In yet another aspect of the invention, improved hydroclone intake structures are described.Type: GrantFiled: May 17, 2012Date of Patent: April 22, 2014Assignee: Dow Global Technologies LLCInventors: David J. Levitt, Frank Dutro
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Patent number: 8489367Abstract: A reference model may be defined to refer to a matrix of a target computerized system. The reference model may comprise a reference index and a reference matrix. The reference index may have a non-deterministic value enabling the reference matrix to refer to the matrix using a fewer number of cells. The disclosed subject matter may enable a more efficient model checking process of a computerized device by using a reference model that is relatively easy to define or maintain or by using a reference model that is configured to be more efficient for model checking as it uses non-determinism.Type: GrantFiled: September 30, 2009Date of Patent: July 16, 2013Assignee: International Business Machines CorporationInventors: Gadiel Auerbach, David J. Levitt
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Publication number: 20130126421Abstract: A variety of improved hydroclone based fluid filtering systems are described. The hydroclones generally include a tank having an internal chamber and a filter (preferably a surface filter) that is positioned within the internal chamber. The filter defines a filtered fluid chamber within the internal chamber of the tank. The hydroclone may be operated such that a vortex of flowing fluid is formed between the chamber wall and the filter with the filter being located in the center of the vortex. With this arrangement, the filter acts as a cross-flow filter. In one aspect of the invention, a circulating cleaning assembly is provided in the hydroclone region. In yet another aspect of the invention, improved hydroclone intake structures are described.Type: ApplicationFiled: May 17, 2012Publication date: May 23, 2013Inventors: David J. Levitt, Frank Dutro
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Patent number: 8370553Abstract: A mechanism is provide for formally verifying random priority-based arbiters. A determination is made as to whether a random priority-based arbiter is blocking one of a set of output ports or a set of input ports. Responsive to the first predetermined time period expiring before the processor determines whether the random priority-based arbiter is blocking, a determination is made as to whether the random priority-based arbiter is blocking one of the set of output ports or the set of input ports within a second predetermined time period using the random seed and at least one of property strengthening or underapproximation. Responsive to the processor determining that the random priority-based arbiter satisfies a non-blocking specification such that not one of the set of output ports or the set of input ports is blocked within the second predetermined time period, the random priority-based arbiter is validated as satisfying the non-blocking specification.Type: GrantFiled: October 18, 2010Date of Patent: February 5, 2013Assignee: International Business Machines CorporationInventors: Gadiel Auerbach, Fady Copty, David J. Levitt, Viresh Paruthi
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Patent number: 8201697Abstract: A variety of improved hydroclone based fluid filtering systems are described. The hydroclones generally include a tank having an internal chamber and a filter (preferably a surface filter) that is positioned within the internal chamber. The filter defines a filtered fluid chamber within the internal chamber of the tank. The hydroclone may be operated such that a vortex of flowing fluid is formed between the chamber wall and the filter with the filter being located in the center of the vortex. With this arrangement, the filter acts as a cross-flow filter. In one aspect of the invention, the filter is a stepped filter. In another aspect of the invention, the filter is an surface filter, as for example, an electroformed metal surface filter. In some preferred embodiments, the openings in the filter are arranged as slots that extend substantially vertically so that they are oriented substantially perpendicular to the flow path of fluid flowing in the adjacent portion of the vortex.Type: GrantFiled: February 1, 2011Date of Patent: June 19, 2012Assignee: Dow Global Technologies LLCInventors: David J. Levitt, Frank Dutro
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Publication number: 20120111635Abstract: The present invention relates to the field of rock and soil core sampling and more specifically to the preservation of core sample integrity. A sample capsule is described which comprises heat shrink tubing. The sample capsule is located inside a sampling tool such as a core drill bit and activated by electric film heaters also inside the drill bit. A sample capsule front end cap may also be included. A cache mechanism is described which may store one or more sample capsules and front end caps.Type: ApplicationFiled: April 12, 2011Publication date: May 10, 2012Inventors: George Caffell, David J. Levitt
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Publication number: 20120096204Abstract: A mechanism is provide for formally verifying random priority-based arbiters. A determination is made as to whether a random priority-based arbiter is blocking one of a set of output ports or a set of input ports. Responsive to the first predetermined time period expiring before the processor determines whether the random priority-based arbiter is blocking, a determination is made as to whether the random priority-based arbiter is blocking one of the set of output ports or the set of input ports within a second predetermined time period using the random seed and at least one of property strengthening or underapproximation. Responsive to the processor determining that the random priority-based arbiter satisfies a non-blocking specification such that not one of the set of output ports or the set of input ports is blocked within the second predetermined time period, the random priority-based arbiter is validated as satisfying the non-blocking specification.Type: ApplicationFiled: October 18, 2010Publication date: April 19, 2012Applicant: International Business Machines CorporationInventors: Gadiel Auerbach, Fady Copty, David J. Levitt, Viresh Paruthi
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Publication number: 20120010063Abstract: Cleaning assemblies and particulate tolerant fluid bearings that are particularly well suited for use in centrifugal separation enhanced filtration devices are described. In one aspect of the invention, at least one bearing is arranged to carry a circulating cleaning assembly such that the cleaning assembly can rotate around a filter membrane during filtering operation of the filtration device. The bearing is preferably arranged to maintain the circulating cleaning assembly in a substantially coaxial alignment with the filter membrane and in a substantially stable longitudinal position relative to the filter membrane as the circulating cleaning assembly is rotated around the filter membrane. In another aspect of the invention a variety of particulate tolerant bearings are described.Type: ApplicationFiled: June 17, 2011Publication date: January 12, 2012Applicant: CLEAN FILTRATION TECHNOLOGIES, INC.Inventors: David J. Levitt, George D. Caffell, John H. Mallard, Steven E. O'Reilly
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Publication number: 20110220586Abstract: Fluid filtration devices and methods of filtering fluids are described. The devices generally include a housing and an annular filter assembly, wherein the filter assembly is located inside the housing and comprises a filter material. The filter material may be, for example, an electroformed nickel screen having a smooth working surface and expanding pores. A rotating cleaning assembly comprising a distributor and wipers may be located inside the filter assembly.Type: ApplicationFiled: March 10, 2011Publication date: September 15, 2011Inventor: David J. Levitt
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Publication number: 20110120959Abstract: A variety of improved hydroclone based fluid filtering systems are described. The hydroclones generally include a tank having an internal chamber and a filter (preferably a surface filter) that is positioned within the internal chamber. The filter defines a filtered fluid chamber within the internal chamber of the tank. The hydroclone may be operated such that a vortex of flowing fluid is formed between the chamber wall and the filter with the filter being located in the center of the vortex. With this arrangement, the filter acts as a cross-flow filter. In one aspect of the invention, the filter is a stepped filter. In another aspect of the invention, the filter is an surface filter, as for example, an electroformed metal surface filter. In some preferred embodiments, the openings in the filter are arranged as slots that extend substantially vertically so that they are oriented substantially perpendicular to the flow path of fluid flowing in the adjacent portion of the vortex.Type: ApplicationFiled: February 1, 2011Publication date: May 26, 2011Applicant: CLEAN FILTRATION TECHNOLOGIES, INC.Inventors: David J. LEVITT, Frank DUTRO
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Publication number: 20110077915Abstract: A reference model may be defined to refer to a matrix of a target computerized system. The reference model may comprise a reference index and a reference matrix. The reference index may have a non-deterministic value enabling the reference matrix to refer to the matrix using a fewer number of cells. The disclosed subject matter may enable a more efficient model checking process of a computerized device by using a reference model that is relatively easy to define or maintain or by using a reference model that is configured to be more efficient for model checking as it uses non-determinism.Type: ApplicationFiled: September 30, 2009Publication date: March 31, 2011Applicant: International Business Machines CorporationInventors: Gadiel Auerbach, David J. Levitt
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Patent number: 7896169Abstract: A variety of improved hydroclone based fluid filtering systems are described. The hydroclones generally include a tank having an internal chamber and a filter (preferably a surface filter) that is positioned within the internal chamber. The filter defines a filtered fluid chamber within the internal chamber of the tank. The hydroclone may be operated such that a vortex of flowing fluid is formed between the chamber wall and the filter with the filter being located in the center of the vortex. With this arrangement, the filter acts as a cross-flow filter. In one aspect of the invention, the filter is a stepped filter. In another aspect of the invention, the filter is an surface filter, as for example, an electroformed metal surface filter. In some preferred embodiments, the openings in the filter are arranged as slots that extend substantially vertically so that they are oriented substantially perpendicular to the flow path of fluid flowing in the adjacent portion of the vortex.Type: GrantFiled: August 18, 2006Date of Patent: March 1, 2011Assignee: Clean Filtration Technologies, Inc.Inventors: David J. Levitt, Frank Dutro
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Patent number: 7632416Abstract: A variety of improved hydroclone based fluid filtering systems are described. The hydroclones generally include a tank having an internal chamber and a filter (preferably a surface filter) that is positioned within the internal chamber. The filter defines a filtered fluid chamber within the internal chamber of the tank. The hydroclone may be operated such that a vortex of flowing fluid is formed between the chamber wall and the filter with the filter being located in the center of the vortex. With this arrangement, the filter acts as a cross-flow filter. In one aspect of the invention, the filter is a stepped filter. In another aspect of the invention, the filter is an surface filter, as for example, an electroformed metal surface filter. In some preferred embodiments, the openings in the filter are arranged as slots that extend substantially vertically so that they are oriented substantially perpendicular to the flow path of fluid flowing in the adjacent portion of the vortex.Type: GrantFiled: August 18, 2006Date of Patent: December 15, 2009Assignee: Clean Filtration Technologies, Inc.Inventor: David J. Levitt