Patents by Inventor Rakesh K. Gupta
Rakesh K. Gupta 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: 10507453Abstract: A nanoclay based solid sorbent is provided having a nanoclay with at least one surface, and at least one amine containing compound wherein the amine containing compound is attached to the surface, as well as a method of making it. A method of capturing carbon dioxide gas is disclosed includes passing a gas from an effluent process stream containing carbon dioxide through the nanoclay based solid sorbent and capturing the carbon dioxide gas on the surface and within the nanoclay based solid sorbent. The nanoclay based solid sorbent having the captured carbon dioxide gas is regenerated by undergoing one or more cycles of desorption of the captured carbon dioxide gas from the nanoclay. The regenerated nanoclay based solid sorbent may then be reused.Type: GrantFiled: November 1, 2012Date of Patent: December 17, 2019Assignee: West Virginia UniversityInventors: Rakesh K. Gupta, Sushant Agarwal, Elliot Roth
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Patent number: 9030186Abstract: A bandgap voltage reference and voltage regulator system includes a bandgap voltage reference circuit and a voltage regulator circuit that share a single, common amplifier. The amplifier acts as a gain stage for the reference circuit and as an error amplifier for a driver stage of the regulator circuit. The regulator circuit has an input reference generated by the reference circuit, and the reference circuit acts as a load to the driver stage, obviating the need for a bias resistance network. By sharing the amplifier and obviating the need for a resistance network, the area and overall quiescent current of the system are reduced. The system can be implemented in CMOS/BiCMOS technology and is suited for low power applications.Type: GrantFiled: July 12, 2012Date of Patent: May 12, 2015Assignee: Freescale Semiconductor, Inc.Inventors: Rakesh K. Gupta, Jaideep Banerjee, Sanjay K. Wadhwa
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Publication number: 20140015509Abstract: A bandgap voltage reference and voltage regulator system includes a bandgap voltage reference circuit and a voltage regulator circuit that share a single, common amplifier. The amplifier acts as a gain stage for the reference circuit and as an error amplifier for a driver stage of the regulator circuit. The regulator circuit has an input reference generated by the reference circuit, and the reference circuit acts as a load to the driver stage, obviating the need for a bias resistance network. By sharing the amplifier and obviating the need for a resistance network, the area and overall quiescent current of the system are reduced. The system can be implemented in CMOS/BiCMOS technology and is suited for low power applications.Type: ApplicationFiled: July 12, 2012Publication date: January 16, 2014Applicant: FREESCALE SEMICONDUCTOR, INCInventors: Rakesh K. Gupta, Jaideep Banerjee, Sanjay K. Wadhwa
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Publication number: 20130121903Abstract: A nanoclay based solid sorbent is provided having a nanoclay with at least one surface, and at least one amine containing compound wherein the amine containing compound is attached to the surface, as well as a method of making it. A method of capturing carbon dioxide gas is disclosed includes passing a gas from an effluent process stream containing carbon dioxide through the nanoclay based solid sorbent and capturing the carbon dioxide gas on the surface and within the nanoclay based solid sorbent. The nanoclay based solid sorbent having the captured carbon dioxide gas is regenerated by undergoing one or more cycles of desorption of the captured carbon dioxide gas from the nanoclay. The regenerated nanoclay based solid sorbent may then be reused.Type: ApplicationFiled: November 1, 2012Publication date: May 16, 2013Inventors: Rakesh K. Gupta, Sushant Agarwal, Elliot Roth
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Publication number: 20110047522Abstract: Technologies for editing a circuit design implemented in a hardware description language are provided. A representation of a circuit design described by a syntactic description of the circuit is generated. Subsequently, a modification operation is carried out on the circuit design representation after which a modified syntactic description may be generated from the modified representation.Type: ApplicationFiled: May 21, 2010Publication date: February 24, 2011Inventors: Mark W.P. Dane, Gordon N. Walker, Rakesh K. Gupta
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Patent number: 7300792Abstract: The luxA, B, C, D, and E genes from Photorhabdus luminescens have been introduced into Saccharomyces cerevisiae bioluminescent yeast cells.Type: GrantFiled: April 4, 2003Date of Patent: November 27, 2007Assignee: University of Tennessee Research FoundationInventors: Rakesh K. Gupta, Stacy S. Patterson, Gary S. Sayler, Steven A. Ripp
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Patent number: 7114374Abstract: A method for making fluid elasticity measurements using an extensional viscometer (100) is disclosed, where stress is not directly measured but is inferred from an accurate measurement of the change in the rate of flow of a liquid during passage through a vertical capillary (104). The flow rate changes when the liquid jet, also called the liquid filament, leaving a first capillary (104), is stretched by the application of vacuum forces. Steady flow is established almost instantly by using a constant liquid head (102, 118) above the capillary, and the flow rate is determined by timing the interval for liquid to drain between two marks (110, 112) on the liquid reservoir surface. Extensional viscosity can be calculated as a ratio of the tensile stress and stretch rate of the liquid at different axial positions.Type: GrantFiled: June 21, 2002Date of Patent: October 3, 2006Assignee: West Virginia UniversityInventors: Rakesh K. Gupta, Sushant Agarwal
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Publication number: 20040206163Abstract: A method for making fluid elasticity measurements using an extensional viscometer (100) is disclosed, where stress is not directly measured but is inferred from an accurate measurement of the change in the rate of flow of a liquid during passage through a vertical capillary (104). The flow rate changes when the liquid jet, also called the liquid filament, leaving a first capillary (104), is stretched by the application of vacuum forces. Steady flow is established almost instantly by using a constant liquid head (102,118) above the capillary, and the flow rate is determined by timing the interval for liquid to drain between two marks (110,112) on the liquid reservoir surface. Extensional viscosity can be calculated as a ratio of the tensile stress and stretch rate of the liquid at different axial positions.Type: ApplicationFiled: June 10, 2004Publication date: October 21, 2004Inventors: Rakesh K Gupta, Sushant Agarwal
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Publication number: 20040002148Abstract: The luxA, B, C, D, and E genes from Photorhabdus luminescens have been introduced into Saccharomyces cerevisiae bioluminescent yeast cells.Type: ApplicationFiled: April 4, 2003Publication date: January 1, 2004Inventors: Rakesh K. Gupta, Stacy S. Patterson, Gary S. Sayler, Steven A. Ripp
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Patent number: 6458726Abstract: Process of producing skin-core fibers and the resulting fibers and nonwoven materials and articles wherein the fibers are composed of a polymer blend of a polyolefin and polymeric bond curve enhancing agents, such as ethylene vinyl acetate polymers.Type: GrantFiled: July 15, 1999Date of Patent: October 1, 2002Assignee: Fiberco, Inc.Inventors: James H. Harrington, Randall E. Kozulla, John F. L. Newport, Edward J. Engle, Elizabeth L. Fahey, Walter J. Freeman, Rakesh K. Gupta, Carl J. Wust
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Patent number: 6177191Abstract: Hydrophobic polyolefin fibers are provided with an internal hydrophobic polysiloxane of the formula in which X, Y, R1, and R2, which may be the same or different, or substituted or unsubstituted independently of each other, are aliphatic groups having not more than about sixteen carbon atoms, R1 and R2 also being selected from among aryl groups, and z being a positive number sufficiently high that the polysiloxane is hydrophobic (z is generally a least 10). The invention also provides a novel polymer melt for spinning these hydrophobic fibers. The fibers can be cut into staple lengths and carded and bonded to form hydrophobic woven and nonwoven products suitable for use in hygiene devices such as diapers. Such devices are improved by these fibers, which, as spun, present a greater hydrophobicity than melt-spun polyolefin fibers lacking the internal siloxane lubricant, the improved hydrophobicity is evidenced by an advancing contact angle for the as-spun fibers of at least about 95°.Type: GrantFiled: February 18, 1998Date of Patent: January 23, 2001Assignee: Hercules IncorporatedInventors: Rakesh K. Gupta, James H. Harrington
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Patent number: 6117546Abstract: A yarn comprising linear low density polyethylene fiber and nonmelting fiber or fiber having a melting point higher than the linear low density polyethylene fiber, and structures made therefrom.Type: GrantFiled: October 8, 1997Date of Patent: September 12, 2000Assignee: Hercules IncorporatedInventors: James D. Geiman, Rakesh K. Gupta, Randall E. Kozulla, Richard J. Legare, Robert G. MacLellan
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Patent number: 6116883Abstract: Process and apparatus for spinning polymer filaments permits the obtaining of skin-core filament structure by feeding a polymer composition to a spinnerette at a flow rate sufficient to obtain a spinning speed of about 10 to 200 meters per minute through the spinnerette; heating the polymer composition at a location at or adjacent to the spinnerette so as to heat the polymer composition to a sufficient temperature to obtain a skin-core filament structure upon quenching in an oxidative atmosphere; extruding the heated polymer composition through the spinnerette at a spinning speed of about 10 to 200 meters per minute to form molten filaments; and quenching the molten filaments in an oxidative atmosphere so as to effect oxidative chain scission degradation of at least a surface of the molten filaments to obtain filaments having a skin-core structure.Type: GrantFiled: February 7, 1996Date of Patent: September 12, 2000Assignee: Fiberco, Inc.Inventors: Kunihiko Takeuchi, Rakesh K. Gupta, Shiv Sibal, Richard J. Coffin, Walter J. Freeman
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Patent number: 5985193Abstract: Process of producing skin-core fibers and the resulting fibers and nonwoven materials and articles wherein the fibers are composed of a polymer blend of a polyolefin and polymeric bond curve enhancing agents, such as ethylene vinyl acetate polymers.Type: GrantFiled: October 9, 1996Date of Patent: November 16, 1999Assignee: Fiberco., Inc.Inventors: James H. Harrington, Randall E. Kozulla, John F. L. Newport, Edward J. Engle, Elizabeth L. Fahey, Walter J. Freeman, Rakesh K. Gupta, Carl J. Wust
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Patent number: 5888438Abstract: Thermobondable fiber of at least one first component of polypropylene having a melt flow rate of 0.5-30, and at least one second component of polypropylene having a melt flow rate of 60-1000.Type: GrantFiled: February 13, 1997Date of Patent: March 30, 1999Assignee: Hercules IncorporatedInventors: Rakesh K. Gupta, James E. Mallory, Kunihiko Takeuchi
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Patent number: 5824613Abstract: A laminate comprising (1) at least one layer of a textile structure comprising linear low density polyethylene fiber and (2) at least one layer of a textile structure comprising nomnelting fiber or fiber having a melting point higher than the linear low density polyethylene fiber, needlepunched and thermally consolidated together.Type: GrantFiled: May 3, 1996Date of Patent: October 20, 1998Assignee: Hercules IncorporatedInventors: James D. Geiman, Rakesh K. Gupta, Randall E. Kozulla, Richard J. Legare, Robert G. MacLellan
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Patent number: 5763334Abstract: Hydrophobic polyolefin fibers are provided with an internal hydrophobic polysiloxane of the formula X--?Si(R.sup.1)(R.sup.2)--O--!.sub.z --Y, in which X, Y, R.sup.1, and R.sup.2, which may be the same or different, or substituted or unsubstituted independently of each other, are aliphatic groups having not more than about sixteen carbon atoms, R.sup.1 and R.sup.2 also being selected from among aryl groups, and z being a positive number sufficiently high that the polysiloxane is hydrophobic (z is generally at least 10). The invention also provides a novel polymer melt for spinning these hydrophobic fibers. The fibers can be cut into staple lengths and carded and bonded to form hydrophobic woven and nonwoven products suitable for use in hygiene devices such as diapers.Type: GrantFiled: September 17, 1996Date of Patent: June 9, 1998Assignee: Hercules IncorporatedInventors: Rakesh K. Gupta, James H. Harrington
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Patent number: 5733646Abstract: Thermobondable fiber of at least one first component of polypropylene having a melt flow rate of 0.5-30, and at least one second component of polypropylene having a melt flow rate of 60-1000.Type: GrantFiled: June 6, 1995Date of Patent: March 31, 1998Assignee: Hercules IncorporatedInventors: Rakesh K. Gupta, James E. Mallory, Kunihiko Takeuchi
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Patent number: 5712209Abstract: A fabric comprising a warp yarn and a filling yarn, wherein the filling yarn comprises linear low density polyethylene fiber and the warp yarn comprises nonmelting fiber or fiber having a melting point higher than the linear low density polyethylene fiber.Type: GrantFiled: May 3, 1996Date of Patent: January 27, 1998Assignee: Hercules IncorporatedInventors: James D. Geiman, Rakesh K. Gupta, Randall E. Kozulla, Richard J. Legare, Robert G. MacLellan
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Patent number: 5705119Abstract: Process and apparatus for spinning polymer filaments permits the obtaining of skin-core filament structure by feeding a polymer composition to a spinnerette at a flow rate sufficient to obtain a spinning speed of about 10 to 200 meters per minute through the spinnerette; heating the polymer composition at a location at or adjacent to the spinnerette so as to heat the polymer composition to a sufficient temperature to obtain a skin-core filament structure upon quenching in an oxidative atmosphere; extruding the heated polymer composition through the spinnerette at a spinning speed of about 10 to 200 meters per minute to form molten filaments; and quenching the molten filaments in an oxidative atmosphere so as to effect oxidative chain scission degradation of at least a surface of the molten filaments to obtain filaments having a skin-core structure.Type: GrantFiled: February 7, 1996Date of Patent: January 6, 1998Assignee: Hercules IncorporatedInventors: Kunihiko Takeuchi, Rakesh K. Gupta, Shiv Sibal, Richard J. Coffin, Walter J. Freeman