Patents by Inventor Pankaj Arora
Pankaj Arora 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: 8239807Abstract: A method for generating a standard cell layout pattern for standard cell placement in an integrated circuit uses a congestion map. First, congestion zones are identified in a congestion map generated by an Electronic Design Automation (EDA) application. Next, routing tracks data corresponding to bounding boxes belonging to the congestion zones are used to calculate values of average vertical and horizontal congestion. Subsequently, a value of modified standard cell density is calculated based on the values of average vertical and horizontal congestion, and an unmodified standard cell density. The dimensions of a layout pattern unit are calculated using the value of the modified standard cell density and the width of standard cells. Various layout pattern units then are placed adjacent to one another to form a standard cell layout pattern.Type: GrantFiled: June 1, 2010Date of Patent: August 7, 2012Assignee: Freescale Semiconductor, IncInventors: Pankaj Arora, Tarun Gupta, Manoj Singh
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Patent number: 8214484Abstract: To predict edges in a non-cumulative graph, based on a sequence of non-cumulative previous occurrences of the graph, the sequence of non-cumulative previous occurrences of the graph is obtained, and topological properties of each of the previous occurrences of the graph are extracted. Topological similarities between each of the previous occurrences of the graph are computed based on the topological properties. The edges of the graph are predicted by computing a score for each possible edge of the graph, based upon the topological similarities.Type: GrantFiled: November 29, 2007Date of Patent: July 3, 2012Assignee: International Business Machines CorporationInventors: Pankaj Arora, Sameep Mehta, Laurent S. Mignet
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Publication number: 20110296366Abstract: A method for generating a standard cell layout pattern for standard cell placement in an integrated circuit uses a congestion map. First, congestion zones are identified in a congestion map generated by an Electronic Design Automation (EDA) application. Next, routing tracks data corresponding to bounding boxes belonging to the congestion zones are used to calculate values of average vertical and horizontal congestion. Subsequently, a value of modified standard cell density is calculated based on the values of average vertical and horizontal congestion, and an unmodified standard cell density. The dimensions of a layout pattern unit are calculated using the value of the modified standard cell density and the width of standard cells. Various layout pattern units then are placed adjacent to one another to form a standard cell layout pattern.Type: ApplicationFiled: June 1, 2010Publication date: December 1, 2011Applicant: FREESCALE SEMICONDUCTOR, INC.Inventors: Pankaj Arora, Tarun Gupta, Manoj Singh
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Publication number: 20110143207Abstract: This invention provides a multi-layer article comprising a first electrode material, a second electrode material, and a porous separator disposed between and in contact with the first and the second electrode materials, wherein the porous separator comprises a nanoweb consisting essentially of a plurality of nanofibers of a fully aromatic polyimide. Also provided is a method for preparing the multi-layer article, and an electrochemical cell employing the same. A multi-layer article comprising a polyimide nanoweb with enhanced properties is also provided.Type: ApplicationFiled: October 7, 2010Publication date: June 16, 2011Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: PANKAJ ARORA, Stephane Francois Bazzana, T. Joseph Dennes, Eric P. Holowka, Lakshmi Krishnamurthy, Stephen Mazur, Glen E. Simmonds
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Publication number: 20110143217Abstract: This invention provides an electrochemical cell comprising a housing having disposed therewithin, an electrolyte, and a multi-layer article at least partially immersed in the electrolyte; the multi-layer article comprising a first metallic current collector, a first electrode material in electrically conductive contact with the first metallic current collector, a second electrode material in ionically conductive contact with the first electrode material, a porous separator disposed between and contacting the first electrode material and the second electrode material; and, a second metallic current collector in electrically conductive contact with the second electrode material, wherein the porous separator comprises a nanoweb consisting essentially of a plurality of nanofibers of a fully aromatic polyimide. Also provided is a process for preparing the multi-layer article. Further provided is an electrochemical cell wherein the separator is a polyimide nanoweb with enhanced properties.Type: ApplicationFiled: October 7, 2010Publication date: June 16, 2011Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: PANKAJ ARORA, Stephane Francois Bazzana, T. Joseph Dennes, Eric P. Holowka, Lakshmi Krishnamurthy, Stephen Mazur, Glen E. Simmonds
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Publication number: 20110139331Abstract: The invention provides a method for enhancing the properties of polyimide nanowebs, the method comprising subjecting a nanoweb consisting essentially of a plurality of nanofibers of an aromatic polyimide to a temperature at least 50 C.° higher than the imidization temperature thereof for a period of time in the range of 5 seconds to 20 minutes, thereby preparing an enhanced nanoweb. Also provided is a multi-layer article comprising the enhanced nanoweb, and an electrochemical cell comprising the multi-layer article.Type: ApplicationFiled: October 7, 2010Publication date: June 16, 2011Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Pankaj Arora, Stephane Francois Bazzana, T. Joseph Dennes, Eric P. Holowka, Lakshmi Krishnamurthy, Stephen Mazur, Glen E. Simmonds
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Publication number: 20110117416Abstract: Alkaline batteries are disclosed that advantageously include separators comprising at least one porous layer of fine fibers having a diameter of between about 50 nm and about 3000 nm that provide improved combinations of reduced thickness, dendritic barrier against short-circuiting and low ionic resistance as compared with known battery separators. The fine fibers show improved wet-ability in the alkaline electrolytes.Type: ApplicationFiled: January 24, 2011Publication date: May 19, 2011Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Pankaj Arora, Simon Frisk, Young H. Kim
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Patent number: 7790320Abstract: A battery separator is a microporous membrane. The membrane has a major volume of a thermoplastic polymer and a minor volume of an inert particulate filler. The filler is dispersed throughout the polymer. The membrane exhibits a maximum Z-direction compression of 95% of the original membrane thickness. Alternatively, the battery separator is a microporous membrane having a TMA compression curve with a first substantially horizontal slope between ambient temperature and 125° C., a second substantially horizontal slope at greater than 225° C. The curve of the first slope has a lower % compression than the curve of the second slope. The curve of the second slope is not less than 5% compression. The TMA compression curve is graphed so that the Y-axis represents % compression from original thickness and the X-axis represents temperature.Type: GrantFiled: January 2, 2007Date of Patent: September 7, 2010Assignee: Celgard LLCInventors: Pankaj Arora, Ronald W. Call, Tien Dao, Khuy V. Nguyen, Donald K. Simmons, Zhengming Zhang
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Patent number: 7760486Abstract: The present invention provides an aluminum electrolytic capacitor having a cathode, an anode and an improved spacer comprised of polymeric nanofibers. The nanofiber spacer offers low ionic resistance, desirable barrier properties and high electrolyte absorption. The use of the improved spacer results in devices having higher capacitance, lower ESR, less heat generation and improved capacitor manufacturing efficiency.Type: GrantFiled: August 28, 2007Date of Patent: July 20, 2010Assignee: E. I. du Pont de Nemours and CompanyInventors: Pankaj Arora, Simon Frisk
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Publication number: 20090261035Abstract: A nonwoven web of fibers that have a number average diameter of less than 1 micron. The web can have a Poisson Ratio of less than about 0.8, a solidity of at least about 20%, a basis weight of at least about 1 gsm, and a thickness of at least 1 micrometer.Type: ApplicationFiled: July 1, 2009Publication date: October 22, 2009Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: PANKAJ ARORA, Guanghui Chen, Simon Frisk, David Keith Graham, JR., Robert Anthony Marin, Hageun Suh
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Publication number: 20090178206Abstract: The invention is an improved process for stripping chemically bonded spinning solvent from a solution-spun nonwoven web by adding antioxidant to the fiber-forming polymer, and transporting the nonwoven web through a solvent stripping zone at a temperature and for a time sufficient to reduce the solvent concentration of the fibers to less than about 1000 ppmw.Type: ApplicationFiled: November 7, 2008Publication date: July 16, 2009Inventors: Pankaj Arora, Joseph Brian Hovanec, Junaid Ahmed Siddiqui, Simon Frisk
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Publication number: 20090141028Abstract: To predict edges in a non-cumulative graph, based on a sequence of non-cumulative previous occurrences of the graph, the sequence of non-cumulative previous occurrences of the graph is obtained, and topological properties of each of the previous occurrences of the graph are extracted. Topological similarities between each of the previous occurrences of the graph are computed based on the topological properties. The edges of the graph are predicted by computing a score for each possible edge of the graph, based upon the topological similarities.Type: ApplicationFiled: November 29, 2007Publication date: June 4, 2009Applicant: International Business Machines CorporationInventors: Pankaj Arora, Sameep Mehta, Laurent S. Mignet
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Publication number: 20090144032Abstract: To predict edges in a non-cumulative graph, based on a sequence of non-cumulative previous occurrences of the graph, the sequence of non-cumulative previous occurrences of the graph is obtained, and topological properties of each of the previous occurrences of the graph are extracted. Topological similarities between each of the previous occurrences of the graph are computed based on the topological properties. The edges of the graph are predicted by computing a score for each possible edge of the graph, based upon the topological similarities.Type: ApplicationFiled: November 29, 2007Publication date: June 4, 2009Applicant: International Business Machines CorporationInventors: Pankaj Arora, Sameep Mehta, Laurent S. Mignet
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Publication number: 20090059475Abstract: The present invention provides an aluminum electrolytic capacitor having a cathode, an anode and an improved spacer comprised of polymeric nanofibers. The nanofiber spacer offers low ionic resistance, desirable barrier properties and high electrolyte absorption. The use of the improved spacer results in devices having higher capacitance, lower ESR, less heat generation and improved capacitor manufacturing efficiency.Type: ApplicationFiled: August 28, 2007Publication date: March 5, 2009Inventors: Pankaj Arora, Simon Frisk
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Publication number: 20080305389Abstract: Alkaline batteries are disclosed that advantageously include separators comprising at least one porous layer of fine fibers having a diameter of between about 50 nm and about 3000 nm that provide improved combinations of reduced thickness, dendritic barrier against short-circuiting and low ionic resistance as compared with known battery separators. The fine fibers show improved wet-ability in the alkaline electrolytes.Type: ApplicationFiled: June 11, 2007Publication date: December 11, 2008Inventors: Pankaj Arora, Simon Frisk, Young H. Kim
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Publication number: 20080268345Abstract: A battery separator is a microporous membrane. The membrane has a major volume of a thermoplastic polymer and a minor volume of an inert particulate filler. The filler is dispersed throughout the polymer. The membrane exhibits a maximum Z-direction compression of 95% of the original membrane thickness. Alternatively, the battery separator is a microporous membrane having a TMA compression curve with a first substantially horizontal slope between ambient temperature and 125° C., a second substantially horizontal slope at greater than 225° C. The curve of the first slope has a lower % compression than the curve of the second slope. The curve of the second slope is not less than 5% compression. The TMA compression curve is graphed so that the Y-axis represents % compression from original thickness and the X-axis represents temperature.Type: ApplicationFiled: October 18, 2005Publication date: October 30, 2008Inventors: Zhengming Zhang, Khuy V. Nguyen, Pankaj Arora, Ronald W. Call, Donald K. Simmons, Tien Dao
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Publication number: 20080070463Abstract: A nonwoven web of fibers that have a number average diameter of less than 1 micron. The web can have a Poisson Ratio of less than about 0.8, a solidity of at least about 20%, a basis weight of at least about 1 gsm, and a thickness of at least 1 micrometer.Type: ApplicationFiled: September 20, 2006Publication date: March 20, 2008Inventors: Pankaj Arora, Guanghui Chen, Simon Frisk, David Keith Graham, Robert Anthony Marin
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Publication number: 20070105019Abstract: A battery separator is a microporous membrane. The membrane has a major volume of a thermoplastic polymer and a minor volume of an inert particulate filler. The filler is dispersed throughout the polymer. The membrane exhibits a maximum Z-direction compression of 95% of the original membrane thickness. Alternatively, the battery separator is a microporous membrane having a TMA compression curve with a first substantially horizontal slope between ambient temperature and 125° C., a second substantially horizontal slope at greater than 225° C. The curve of the first slope has a lower % compression than the curve of the second slope. The curve of the second slope is not less than 5% compression. The TMA compression curve is graphed so that the Y-axis represents % compression from original thickness and the X-axis represents temperature.Type: ApplicationFiled: January 2, 2007Publication date: May 10, 2007Inventors: Pankaj Arora, Ronald Call, Tien Dao, Khuy Nguyen, Donald Simmons, Zhengming Zhang
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Publication number: 20070072068Abstract: A lithium ion rechargeable battery comprises: a negative electrode adapted to give up electrons during discharge, a positive electrode adapted to gain electrons during discharge, a microporous separator sandwiched between said positive electrode and said negative electrode, an organic electrolyte being contained within said separator and being in electrochemical communication with said positive electrode and said negative electrode, and an oxidative barrier interposed between said separator and said positive electrode, and thereby preventing oxidation of said separator.Type: ApplicationFiled: October 13, 2006Publication date: March 29, 2007Applicant: Celgard Inc.Inventors: Zhengming Zhang, Pankaj Arora
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Patent number: 7170739Abstract: Electrochemical double layer capacitors are disclosed that advantageously include separators having at least one porous layer of nanofibers having average diameters of between about 50 nm and about 1000 nm that provide improved combinations of reduced thickness, barrier against the development of soft short-circuits and low ionic resistance as compared with known capacitor separators.Type: GrantFiled: September 30, 2005Date of Patent: January 30, 2007Assignee: E.I. du Pont de Nemours and CompanyInventors: Pankaj Arora, Simon Frisk, Lu Zhang