Patents by Inventor David J. Schwartz
David J. Schwartz 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: 11958747Abstract: Disclosed are methods and systems of providing carbon nanotubes decorated with polymer coated metal nanoparticles. Then, annealing the metal coated carbon nanotubes to reduce a quantity of hydrophilic components of the polymer coating.Type: GrantFiled: April 20, 2021Date of Patent: April 16, 2024Assignees: SRI INTERNATIONAL, UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF THE NASA, BAY SYSTEMS CONSULTING, INC.Inventors: Gabriel Iftime, Beomseok Kim, Clinton J. Smith, Eric D. Cocker, Junhua Wei, David Eric Schwartz, Meyya Meyyappan, Rahul Pandey, Yong Zhang
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Publication number: 20170033869Abstract: The system and method for ameliorating the effect of close-in user equipment up to a point where the user equipment itself limits the performance. The system and method utilizes a digital filter in front of the LASER modulator being applied to the LASER. Additionally, total power detectors may be used at input to prevent unwanted signals from overloading stages in front of the LASER. The system further includes a scanning receiver capable of scanning and analyzing the wide-band signal received from user equipment in the uplink direction.Type: ApplicationFiled: June 27, 2016Publication date: February 2, 2017Inventors: William J. Crilly, JR., David J. Schwartz
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Patent number: 9467230Abstract: The system and method for ameliorating the effect of close-in user equipment up to a point where the user equipment itself limits the performance. The system and method utilizes a digital filter in front of the LASER modulator being applied to the LASER. Additionally, total power detectors may be used at input to prevent unwanted signals from overloading stages in front of the LASER. In uplink and downlink directions, bidirectional digital filtering in the RUs allows the selective use of a given RU in a given sub-band, by a given WSP. The use of digital filtering in the RU reduces the need for hardware RF switching at the head end to accomplish the same objective of signal flexibility, by one of more WSPs, providing one or more sectors exists within the DAS.Type: GrantFiled: March 3, 2014Date of Patent: October 11, 2016Assignee: Westell, Inc.Inventors: William J. Crilly, Jr., David J. Schwartz
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Publication number: 20140248050Abstract: The system and method for ameliorating the effect of close-in user equipment up to a point where the user equipment itself limits the performance. The system and method utilizes a digital filter in front of the LASER modulator being applied to the LASER. Additionally, total power detectors may be used at input to prevent unwanted signals from overloading stages in front of the LASER. In uplink and downlink directions, bidirectional digital filtering in the RUs allows the selective use of a given RU in a given sub-band, by a given WSP. The use of digital filtering in the RU reduces the need for hardware RF switching at the head end to accomplish the same objective of signal flexibility, by one of more WSPs, providing one or more sectors exists within the DAS.Type: ApplicationFiled: March 3, 2014Publication date: September 4, 2014Inventors: William J. Crilly, JR., David J. Schwartz
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Patent number: 8199724Abstract: Systems, devices and method are provided in association with a multiple beam antenna base station. One system embodiment includes a multiple beam antenna base station configured to communicate data to a number of subscriber stations using a number of multiple antenna beams. The multiple beam antenna base station is implemented with an independent receiver for each of the number of multiple antenna beams. In various embodiments, each of the independent receivers of the multiple beam antenna base station is configured to determine signal quality of a preamble of an uplink transmission from a subscriber station via the number of multiple antenna beams.Type: GrantFiled: September 25, 2006Date of Patent: June 12, 2012Assignee: XR Communications, LLCInventor: David J. Schwartz
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Publication number: 20080160639Abstract: An embodiment of the invention relates to a device comprising (1) an array of electromagnetic elements comprising coils, metal cores, and metal core heads, and (2) a controller that is adapted to control a current for one or more coils individually, to vary the current for said one or more coils individually, to reverse the current for one or more coils individually, and to generate a specific magnetic flux distribution and gradient across two or more coils; wherein the metal core head is at one end of the coil and the metal core head has a geometry to create a desired magnetic flux, intensity and gradient, in a region of interest between two adjacent coils; further wherein the device is functionally coupled to a fluidic device to concentrate and transport magnetic particles in a fluid without fluidic movement of the fluid.Type: ApplicationFiled: December 29, 2006Publication date: July 3, 2008Inventors: Xina Su, KaiWU Swartz, David J. Schwartz
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Patent number: 6528449Abstract: Catalyst compositions useful for olefin polymerizations comprising a Group 3-10 metal complex and a compound corresponding to the formula: AlArfQ1Q2, or a dimer, adduct, or mixture thereof and further mixtures with aluminum compounds of the formula AlArf3, where: Arf is a fluorinated aromatic hydrocarbyl moiety of from 6 to 30 carbon atoms; Q1 is Arf or a C1-20 hydrocarbyl group, optionally substituted with one or more cyclohydrocarbyl, hydrocarbyloxy, hydrocarbylsiloxy, hydrocarbylsilylamino, hydrocarbylsilyl, silylhydrocarbyl, di(hydrocarbylsilyl)amino, hydrocarbylamino, di(hydrocarbyl)amino, di(hydrocarbyl)phosphino, or hydrocarbylsulfido groups having from 1 to 20 atoms other than hydrogen, or, further optionally, such substituents may be covalently linked with each other to form one or more fused rings or ring systems; and Q2 is an aryloxy, arylsulfide or di(hydrocarbyl)amido group, optionally substituted with one or more hydrocarbyl, cyclohydrocarbyl, hydrocarbyloxy, hydrocarbylsiloxy, hydrocarbylsilType: GrantFiled: October 31, 2000Date of Patent: March 4, 2003Assignee: The Dow Chemical ComapnyInventors: Eugene Y. Chen, William J. Kruper, Jr., Gordon R. Roof, David J. Schwartz, Joey W. Storer
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Patent number: 6387838Abstract: Compositions comprising: A) an aluminum compound corresponding to the formula AlArf3, where Arf is a fluorinated aromatic hydrocarbyl moiety of from 6 to 30 carbon atoms; B) an aluminum compound corresponding to the formula: AlArfQ1Q2, or a dimer, adduct, or mixture thereof; where: Arf is as previously defined; Q1 is Arf or a C1-20 hydrocarbyl group, optionally substituted with one or more cyclohydrocarbyl, hydrocarbyloxy, hydrocarbylsiloxy, hydrocarbylsilylamino, hydrocarbylsilyl, silylhydrocarbyl, di(hydrocarbylsilyl)amino, hydrocarbylamino, di(hydrocarbyl)amino, di(hydrocarbyl)phosphino, or hydrocarbylsulfido groups having from 1 to 20 atoms other than hydrogen, or, further optionally, such substituents may be covalently linked with each other to form one or more fused rings or ring systems; and Q2 is an aryloxy, arylsulfide or di(hydrocarbyl)amido group, optionally substituted with one or more hydrocarbyl, cyclohydrocarbyl, hydrocarbyloxy, hydrocarbylsiloxy, hydrocarbylsilylamino, hydrocarbylsilyl,Type: GrantFiled: January 30, 2001Date of Patent: May 14, 2002Assignee: The Dow Chemical CompanyInventors: Eugene Y. Chen, Gordon R. Roof, William J. Kruper, Jr., David J. Schwartz, Joey W. Storer
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Patent number: 6344529Abstract: Disclosed are compounds useful as catalyst activators for olefin polymerization, comprising structures of the following formulae: wherein: L+ is a protonated derivative of an element of Group 15 of the Periodic Table of the Elements, additionally bearing two hydrocarbyl substituents of from 1 to 50 carbons each, or a positively charged derivative of an element of Group 14 of the Periodic Table of the Elements, said Group 14 element being substituted with three hydrocarbyl substituents of from 1 to 50 carbons each; R1 is a divalent linking group of from 1 to 40 non-hydrogen atoms; R2 independently each occurrence is a ligand group of from 1 to 50 nonhydrogen atoms with the proviso that in a sufficient number of occurrences to balance charge in the compound, R2 is L+—R1—; M1 is boron, aluminum or gallium; Arf independently each occurrence is a monovalent, fluorinated organic group containing from 6 to 100 non-hydrogen atoms; Y is a Group 15 element; and Z is a GrouType: GrantFiled: December 6, 1999Date of Patent: February 5, 2002Assignee: The Dow Chemical CompanyInventors: Edmund M. Carnahan, Grant B. Jacobsen, Jerzy Klosin, Peter N. Nickias, David J. Schwartz, David R. Neithamer
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Patent number: 6268445Abstract: A catalyst activator particularly adapted for use in the activation of metal complexes of metals of Group 3-10 for polymerization of ethylenically unsaturated polymerizable monomers, especially olefins, comprising two Group 13 metal or metalloid atoms and a ligand structure including at least one bridging group connecting ligands on the two Group 13 metal or metalloid atoms.Type: GrantFiled: November 19, 1999Date of Patent: July 31, 2001Assignees: The Dow Chemical Company, Northwestern UniversityInventors: Mark H. McAdon, Peter N. Nickias, Tobin J. Marks, David J. Schwartz
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Patent number: 6211111Abstract: Compositions comprising: A) an aluminum compound corresponding to the formula AlArf3, where Arf is a fluorinated aromatic hydrocarbyl moiety of from 6 to 30 carbon atoms; B) an aluminum compound corresponding to the formula: AlArfQ1Q2, or a dimer, adduct, or mixture thereof; where: Arf is as previously defined; Q1 is Arf or a C1-20 hydrocarbyl group, optionally substituted with one or more cyclohydrocarbyl, hydrocarbyloxy, hydrocarbylsiloxy, hydrocarbylsilylamino, hydrocarbylsilyl, silylhydrocarbyl, di(hydrocarbylsilyl)amino, hydrocarbylamino, di(hydrocarbyl)amino, di(hydrocarbyl)phosphino, or hydrocarbylsulfido groups having from 1 to 20 atoms other than hydrogen, or, further optionally, such substituents may be covalently linked with each other to form one or more fused rings or ring systems; and Q2is an aryloxy, arylsulfide or di(hydrocarbyl)amido group, optionally substituted with one or more hydrocarbyl, cyclohydrocarbyl, hydrocarbyloxy, hydrocarbylsiloxy, hydrocarbylsilylamino, hydrocarbylsilyl, sType: GrantFiled: June 11, 1999Date of Patent: April 3, 2001Assignee: The Dow Chemical CompanyInventors: Eugene Y. Chen, William J. Kruper, Jr., Gordon R. Roof, David J. Schwartz, Joey W. Storer
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Patent number: 6187940Abstract: Compounds corresponding to the formula: AlArfQ1Q2, or a dimer, adduct, or mixture thereof and further mixtures with aluminum compounds of the formula AlArf3, where: Arf is a fluorinated aromatic hydrocarbyl moiety of from 6 to 30 carbon atoms; Q1 is Af or a C1-20 hydrocarbyl group, optionally substituted with one or more cyclohydrocarbyl, hydrocarbyloxy, hydrocarbylsiloxy, hydrocarbylsilylamino, hydrocarbylsilyl, silylhydrocarbyl, di(hydrocarbylsilyl)amino, hydrocarbylamino, di(hydrocarbyl)amino, di(hydrocarbyl)phosphino, or hydrocarbylsulfido groups having from 1 to 20 atoms other than hydrogen, or, further optionally, such substituents may be covalently linked with each other to form one or more fused rings or ring systems; and Q2 is an aryloxy, arylsulfide or di(hydrocarbyl)amido group, optionally substituted with one or more hydrocarbyl, cyclohydrocarbyl, hydrocarbyloxy, hydrocarbylsiloxy, hydrocarbylsilylamino, hydrocarbylsilyl, silylhydrocarbyl, di(hydrocarbylsilyl)amino, hydrocarbylamino, di(hydrocaType: GrantFiled: June 11, 1999Date of Patent: February 13, 2001Assignee: The Dow Chemical CompanyInventors: Eugene Y. Chen, William J. Kruper, Jr., Gordon R. Roof, David J. Schwartz, Joey W. Storer
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Patent number: 5945885Abstract: A digital baseband modulator having a flexible architecture that is readily adaptible to a variety of digital modulation types is provided. A symbol builder maps the input data to a series of modulation states corresponding to data symbols that are represented as state indexes. A pair of digital filters accepts the state indexes being generated by the symbol builder to provide both up-sampling and filtering functions. The digital filters are implemented using random access memory (RAM) to implement blocks of interpolating look-up multipliers which may be readily configured between fast, normal, and long modes. The filtered output data from the digital filters is provided to a resampler that converts the filtered output data to an output sample rate that corresponds to the sample rate of output DACs and corresponding analog low pass filters.Type: GrantFiled: March 5, 1998Date of Patent: August 31, 1999Assignee: Hewlett-Packard CompanyInventors: David J Schwartz, Alan R Bloom, William J. Anklam
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Patent number: 5025369Abstract: A multilevel distributed computer system for distributed processing preferably includes a plurality of personal computers. A task inputted to the system is divided into a plurality of portions. As many of the portions as possible are distributed for processing on the lowest level of the system. Those portions unprocessed on the lowest level are distributed for processing on the next lowest level. Remaining unprocessed portions of the task are distributed to available computers on successively higher levels of the system until all of the task have been distributed for processing.Type: GrantFiled: August 25, 1988Date of Patent: June 18, 1991Assignee: David Schwartz Enterprises, Inc.Inventor: David J. Schwartz