Patents by Inventor Rengaswamy Srinivasan
Rengaswamy Srinivasan 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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Publication number: 20170271647Abstract: A method of preparing a high capacity nanocomposite cathode of FeF3 in carbon pores may include preparing a nanoporous carbon precursor, employing electrochemistry or solution chemistry deposition to deposit Fe particles in the carbon pores, reacting nano Fe with liquid hydrofluoric acid to form nano FeF3 in carbon, and milling to achieve a desired particle size.Type: ApplicationFiled: June 7, 2017Publication date: September 21, 2017Inventors: Jeremy D. Walker, Jeffrey P. Maranchi, Edward D. Russell, Jennifer L. Sample, Marcia W. Patchan, Lance M. Baird, Rengaswamy Srinivasan
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Patent number: 9705124Abstract: A method of preparing a high capacity nanocomposite cathode of FeF3 in carbon pores may include preparing a nanoporous carbon precursor, employing electrochemistry or solution chemistry deposition to deposit Fe particles in the carbon pores, reacting nano Fe with liquid hydrofluoric acid to form nano FeF3 in carbon, and milling to achieve a desired particle size.Type: GrantFiled: August 17, 2012Date of Patent: July 11, 2017Assignee: The Johns Hopkins UniversityInventors: Jeremy D. Walker, Jeffrey P. Maranchi, Edward D. Russell, Jennifer L. Sample, Marcia W. Patchan, Lance M. Baird, Rengaswamy Srinivasan
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Publication number: 20170149256Abstract: A battery charging monitor is provided including a non-invasive sensor electrically connected to at least one battery cell of at least one battery, which is configured to measure an internal temperature of the at least one battery cell. The non-invasive internal temperature sensor is connected to the microcontroller that is configured to determine a rate of change of the internal temperature of the at least one battery cell based on the internal temperature of the at least one battery cell, determine a state of charge of the at least one battery cell based on the rate of change of the internal temperature, and cause a charging rate to be applied, by a battery charger, to the at least one battery cell based on the determined state of charge.Type: ApplicationFiled: March 28, 2016Publication date: May 25, 2017Inventors: Rengaswamy Srinivasan, Bliss G. Carkhuff, Lakshminarayan Srinivasan
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Patent number: 9550855Abstract: A metallic microcapsule containing a polymeric microcapsule having one or more polymeric precursors encapsulated therein; and a metallic shell enclosing a volume containing the polymeric microcapsule is disclosed. Also disclosed is a self-healing coating composition comprising (a) a film-forming binder; and (b) metallic microcapsules, the metallic microcapsules being the same or different and containing a polymeric microcapsule containing one or more polymeric precursors encapsulated therein; and a metallic shell enclosing a volume containing the polymeric microcapsule.Type: GrantFiled: April 11, 2011Date of Patent: January 24, 2017Assignee: The Johns Hopkins UniversityInventors: Jason J. Benkoski, Rengaswamy Srinivasan, Jeffrey P. Maranchi
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Patent number: 9331507Abstract: A battery charging system includes a charging source, at least one battery cell, a battery internal temperature sensor configured to measure an internal temperature of the at least one battery cell responsive to charging of the at least one battery cell by the charging source, and a charge controller. The charge controller is configured to receive indications of the internal temperature of the at least one battery cell over time, to identify an indication that the at least one battery cell is at a point of full charge based on rate of change of the internal temperature, and to interrupt power delivery from the charging source to the at least one battery cell responsive to the indication that the at least one battery cell is at the point of full charge.Type: GrantFiled: April 9, 2013Date of Patent: May 3, 2016Assignee: The Johns Hopkins UniversityInventors: Rengaswamy Srinivasan, Bliss G. Carkhuff
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Patent number: 9281537Abstract: A thin film electrode is fabricated from a non-metallic, non-conductive porous support structure having pores with micrometer-range diameters. The support may include a polymer film. A first surface of the support is metalized, and the pores are partially metallized to create metal tubes having a thickness within a range of 50 to 150 nanometers, in contact with the metal layer. An active material is disposed within metalized portions of the pores. An electrolyte is disposed within non-metalized portions of the pores. Active materials may be selected to create an anode and a cathode. Non-metalized surfaces of the anode and cathode may be contacted to one another to form a battery cell, with the non-metalized electrolyte-containing portions of the anode facing the electrolyte-containing portions of the cathode pores. A battery cell may be fabricated as, for example, a nickel-zinc battery cell.Type: GrantFiled: July 22, 2013Date of Patent: March 8, 2016Assignee: The Johns Hopkins UniversityInventors: Rengaswamy Srinivasan, Jeffrey P. Maranchi, Lance M. Baird, Ryan M. Deacon, Arthur S. Francomacaro, Paul J. Biermann, Craig B. Leese, Gary E. Peck
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Patent number: 8961004Abstract: Methods and systems to determine an internal temperature of a rechargeable lithium-ion cell based on a phase shift of the cell. Internal cell temperature may be determined with respect to an internal anode temperature and/or an internal cathode temperature. Internal anode temperature may be determined based on a phase shift of a frequency within a range of approximately 40 Hertz (Hz) to 500 Hz. Internal cathode temperature may be determined based on a phase shift of a frequency of up to approximately 30 Hz. A temperature sensor as disclosed herein may be powered by a monitored cell with relatively little impact on cell charge, may be electrically coupled to cell but housed physically separate from the cell, and/or may monitor multiple cells in a multiplex fashion. A rate of change in phase shift may be used to initiate pre-emptive action, without determining corresponding temperatures.Type: GrantFiled: October 18, 2011Date of Patent: February 24, 2015Assignee: The Johns Hopkins UniversityInventors: Rengaswamy Srinivasan, Michael H. Butler, Bliss G. Carkhuff, Terry E. Phillips, Jeremy D. Walker, Oscar M. Uy, Andrew C. Baisden
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Publication number: 20130312255Abstract: A thin film electrode is fabricated from a non-metallic, non-conductive porous support structure having pores with micrometer-range diameters. The support may include a polymer film. A first surface of the support is metalized, and the pores are partially metallized to create metal tubes having a thickness within a range of 50 to 150 nanometers, in contact with the metal layer. An active material is disposed within metalized portions of the pores. An electrolyte is disposed within non-metalized portions of the pores. Active materials may be selected to create an anode and a cathode. Non-metalized surfaces of the anode and cathode may be contacted to one another to form a battery cell, with the non-metalized electrolyte-containing portions of the anode facing the electrolyte-containing portions of the cathode pores. A battery cell may be fabricated as, for example, a nickel-zinc battery cell.Type: ApplicationFiled: July 22, 2013Publication date: November 28, 2013Applicant: Johns Hopkins UnivesityInventors: Rengaswamy Srinivasan, Jeffrey P. Maranchi, Lance M. Baird, Ryan M. Deacon, Arthur S. Francomacaro, Paul J. Biermann, Craig B. Leese, Gary E. Peck
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Patent number: 8574767Abstract: Thin-film electrodes and battery cells, and methods of fabrication. A thin film electrode may be fabricated from a non-metallic, non-conductive porous support structure having pores with micrometer-range diameters. The support may include a polymer film. A first surface of the support is metalized, and the pores are partially metallized to create metal tubes having a thickness within a range of 50 to 150 nanometers, in contact with the metal layer. An active material is disposed within metalized portions of the pores. An electrolyte is disposed within non-metalized portions of the pores. Active materials may be selected to create an anode and a cathode. Non-metalized surfaces of the anode and cathode may be contacted to one another to form a battery cell, with the non-metalized electrolyte-containing portions of the anode facing the electrolyte-containing portions of the cathode pores. A battery cell may be fabricated as, for example, a nickel-zinc battery cell.Type: GrantFiled: May 18, 2010Date of Patent: November 5, 2013Assignee: The Johns Hopkins UniversityInventors: Rengaswamy Srinivasan, Jeffrey P. Maranchi, Lance M. Baird, Ryan M. Deacon, Arthur S. Francomacaro, Paul J. Biermann, Craig B. Leese, Gary E. Peck
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Publication number: 20130264999Abstract: A battery charging system includes a charging source, at least one battery cell, a battery internal temperature sensor configured to measure an internal temperature of the at least one battery cell responsive to charging of the at least one battery cell by the charging source, and a charge controller. The charge controller is configured to receive indications of the internal temperature of the at least one battery cell over time, to identify an indication that the at least one battery cell is at a point of full charge based on rate of change of the internal temperature, and to interrupt power delivery from the charging source to the at least one battery cell responsive to the indication that the at least one battery cell is at the point of full charge.Type: ApplicationFiled: April 9, 2013Publication date: October 10, 2013Inventors: Rengaswamy Srinivasan, Bliss G. Carkhuff
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Publication number: 20130220817Abstract: A method of preparing a high capacity nanocomposite cathode of FeF3 in carbon pores may include preparing a nanoporous carbon precursor, employing electrochemistry or solution chemistry deposition to deposit Fe particles in the carbon pores, reacting nano Fe with liquid hydrofluoric acid to form nano FeF3 in carbon, and milling to achieve a desired particle size.Type: ApplicationFiled: August 17, 2012Publication date: August 29, 2013Applicant: THE JOHNS HOPKINS UNIVERSITYInventors: Jeremy D. Walker, Jeffrey P. Maranchi, Edward D. Russell, Jennifer L. Sample, Marcia W. Patchan, Lance M. Baird, Rengaswamy Srinivasan
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Publication number: 20130017405Abstract: A microcapsule is disposed in a self-healing coating having zinc powder particles dispersed therein. The microcapsule includes at least a silane coupling agent encapsulated within a volume defined by a metallic or polymeric shell that is rupturable responsive to formation of a fissure in the self-healing coating.Type: ApplicationFiled: August 23, 2012Publication date: January 17, 2013Applicant: THE JOHNS HOPKINS UNIVERSITYInventors: Jason J. Benkoski, Rengaswamy Srinivasan, Jeffrey P. Maranchi
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Publication number: 20120155507Abstract: Methods and systems to determine an internal temperature of a rechargeable lithium-ion cell based on a phase shift of the cell. Internal cell temperature may be determined with respect to an internal anode temperature and/or an internal cathode temperature. Internal anode temperature may be determined based on a phase shift of a frequency within a range of approximately 40 Hertz (Hz) to 500 Hz. Internal cathode temperature may be determined based on a phase shift of a frequency of up to approximately 30 Hz. A temperature sensor as disclosed herein may be powered by a monitored cell with relatively little impact on cell charge, may be electrically coupled to cell but housed physically separate from the cell, and/or may monitor multiple cells in a multiplex fashion. A rate of change in phase shift may be used to initiate pre-emptive action, without determining corresponding temperatures.Type: ApplicationFiled: October 18, 2011Publication date: June 21, 2012Applicant: JOHNS HOPKINS UNIVERSITYInventors: Rengaswamy Srinivasan, Michael H. Butler, Bliss G. Carkhuff, Terry E. Phillips, Jeremy D. Walker, Oscar M. Uy, Andrew C. Baisden
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Publication number: 20110293958Abstract: A metallic microcapsule containing a polymeric microcapsule having one or more polymeric precursors encapsulated therein; and a metallic shell enclosing a volume containing the polymeric microcapsule is disclosed. Also disclosed is a self-healing coating composition comprising (a) a film-forming binder; and (b) metallic microcapsules, the metallic microcapsules being the same or different and containing a polymeric microcapsule containing one or more polymeric precursors encapsulated therein; and a metallic shell enclosing a volume containing the polymeric microcapsule.Type: ApplicationFiled: April 11, 2011Publication date: December 1, 2011Inventors: Jason J. Benkoski, Rengaswamy Srinivasan, Jeffrey P. Maranchi
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Publication number: 20110123852Abstract: Thin-film electrodes and battery cells, and methods of fabrication. A thin film electrode may be fabricated from a non-metallic, non-conductive porous support structure having pores with micrometer-range diameters. The support may include a polymer film. A first surface of the support is metalized, and the pores are partially metallized to create metal tubes having a thickness within a range of 50 to 150 nanometers, in contact with the metal layer. An active material is disposed within metalized portions of the pores. An electrolyte is disposed within non-metalized portions of the pores. Active materials may be selected to create an anode and a cathode. Non-metalized surfaces of the anode and cathode may be contacted to one another to form a battery cell, with the non-metalized electrolyte-containing portions of the anode facing the electrolyte-containing portions of the cathode pores. A battery cell may be fabricated as, for example, a nickel-zinc battery cell.Type: ApplicationFiled: May 18, 2010Publication date: May 26, 2011Inventors: Rengaswamy Srinivasan, Jeffrey P. Maranchi, Lance M. Baird, Ryan M. Deacon, Arthur S. Francomacaro, Paul J. Biermann, Craig B. Leese, Gary E. Peck
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Patent number: 7554294Abstract: A battery health monitor (BHM) that operates as a battery-mountable full-spectrum alternating current (ac) impedance meter that facilitates monitoring a state-of-charge and a state-of-health of a battery. The BHM is used for monitoring one or more electrical parameters, e.g., impedance, of a battery. The BHM includes: a current sink coupled to the first terminal and configured to sink therefrom an oscillatory current so as to cause the battery to produce at a first terminal thereof an oscillatory voltage equal to or less than a dc operating voltage of the battery that would be present at the first terminal in the absence of the oscillatory current; and a voltage sensor configured to sense the oscillatory voltage at the first terminal.Type: GrantFiled: January 28, 2005Date of Patent: June 30, 2009Assignee: The Johns Hopkins UniversityInventors: Rengaswamy Srinivasan, Hassan M. Saffarian, Terry E. Phillips, Paul R. Zarriello, Bliss G. Carkhuff, Subhas Chalasani
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Patent number: 7148706Abstract: An embeddable corrosion rate meter (ECRM) for detecting and measuring corrosion in metal and concrete structures is provided. The system comprises an electrochemical cell with at least one working electrode evenly separated from a counter electrode, wherein a separation distance between electrodes determines an electrolyte medium resistance and the electrolyte medium resistance is less than or equal to a polarization resistance.Type: GrantFiled: July 18, 2003Date of Patent: December 12, 2006Assignee: Johns Hopkins UniversityInventors: Rengaswamy Srinivasan, Hassan M. Saffarian, Terry E. Phillips
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Publication number: 20060170397Abstract: A battery health monitor (BHM) that operates as a battery-mountable full-spectrum alternating current (ac) impedance meter that facilitates monitoring a state-of-charge and a state-of-health of a battery. The BHM is used for monitoring one or more electrical parameters, e.g., impedance, of a battery. The BHM includes: a current sink coupled to the first terminal and configured to sink therefrom an oscillatory current so as to cause the battery to produce at a first terminal thereof an oscillatory voltage equal to or less than a dc operating voltage of the battery that would be present at the first terminal in the absence of the oscillatory current; and a voltage sensor configured to sense the oscillatory voltage at the first terminal.Type: ApplicationFiled: January 28, 2005Publication date: August 3, 2006Inventors: Rengaswamy Srinivasan, Hassan Saffarian, Terry Phillips, Paul Zarriello, Bliss Carkhuff, Subhas Chalasani
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Publication number: 20060125480Abstract: An embeddable corrosion rate meter (ECRM) for detecting and measuring corrosion in metal and concrete structures is provided. The system comprises an electrochemical cell with at least one working electrode evenly separated from a counter electrode, wherein a separation distance between electrodes determines an electrolyte medium resistance and the electrolyte medium resistance is less than or equal to a polarization resistance.Type: ApplicationFiled: July 18, 2003Publication date: June 15, 2006Inventors: Rengaswamy Srinivasan, Hassan Saffarian, Terry Philips
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Patent number: 7005056Abstract: A method for inhibiting corrosion, e.g., pitting corrosion, of alloys is provided. Particularly, the method comprises contacting at least a portion of a surface of the alloy with an aqueous solution comprising a salt of one or more rare earth elements selected from the group consisting of yttrium, gadolinium, cerium, europium, terbium, samarium, neodymium, praseodymium, lanthanum, holmium, ytterbium, dysprosium and erbium; and establishing a voltage differential between an anode comprising the alloy and a cathode in the solution at an effective level and for a sufficient period of time wherein a rare earth element oxide-containing coating is formed on the surface of the alloy to inhibit corrosion thereof.Type: GrantFiled: October 2, 2001Date of Patent: February 28, 2006Assignee: The Johns Hopkins UniversityInventors: Rengaswamy Srinivasan, Hassan M. Saffarian, Stuart A. Fogel