Patents by Inventor Subbarao Surampudi
Subbarao Surampudi 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: 7488548Abstract: Improvements to non acid methanol fuel cells include new formulations for materials. The platinum and ruthenium are more exactly mixed together. Different materials are substituted for these materials. The backing material for the fuel cell electrode is specially treated to improve its characteristics. A special sputtered electrode is formed which is extremely porous. The fuel cell system also comprises a fuel supplying part including a meter which meters an amount of fuel which is used by the fuel cell, and controls the supply of fuel based on said metering.Type: GrantFiled: August 30, 2004Date of Patent: February 10, 2009Assignee: California Institute of TechnologyInventors: Subbarao Surampudi, Harvey A. Frank, Sekharipuram R. Narayanan, William Chun, Barbara Jeffries-Nakamura, Andrew Kindler, Gerald Halpert
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Patent number: 7470478Abstract: Improvements to non acid methanol fuel cells include new formulations for materials. The platinum and ruthenium are more exactly mixed together. Different materials are substituted for these materials. The backing material for the fuel cell electrode is specially treated to improve its characteristics. A special sputtered electrode is formed which is extremely porous.Type: GrantFiled: March 9, 2004Date of Patent: December 30, 2008Assignee: California Institute of TechnologyInventors: Subbarao Surampudi, Harvey A. Frank, Sekharipuram R. Narayanan, William Chun, Barbara Jeffries-Nakamura, Andrew Kindler, Gerald Halpert
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Patent number: 7445859Abstract: A liquid organic, fuel cell is provided which employs a solid electrolyte membrane. An organic fuel, such as a methanol/water mixture, is circulated past an anode of a cell while oxygen or air is circulated past a cathode of the cell. The cell solid electrolyte membrane is preferably fabricated from Nafion™. Additionally, a method for improving the performance of carbon electrode structures for use in organic fuel cells is provided wherein a high surface-area carbon particle/Teflon™-binder structure is immersed within a Nafion™/methanol bath to impregnate the electrode with Nafion™. A method for fabricating an anode for use in a organic fuel cell is described wherein metal alloys are deposited onto the electrode in an electro-deposition solution containing perfluorooctanesulfonic acid. A fuel additive containing perfluorooctanesulfonic acid for use with fuel cells employing a sulfuric acid electrolyte is also disclosed.Type: GrantFiled: May 27, 2004Date of Patent: November 4, 2008Assignee: California Institute of TechnologyInventors: Eugene Vamos, Subbarao Surampudi, Sekharipuram R. Narayanan, Harvey A. Frank, Gerald Halpert, George A. Olah, G. K. Surya Prakash
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Patent number: 7425384Abstract: Improvements to non acid methanol fuel cells include new formulations for materials. The platinum and ruthenium are more exactly mixed together. Different materials are substituted for these materials. The backing material for the fuel cell electrode is specially treated to improve its characteristics. A special sputtered electrode is formed which is extremely porous.Type: GrantFiled: September 1, 2004Date of Patent: September 16, 2008Assignee: California Institute of TechnologyInventors: Subbarao Surampudi, Harvey A. Frank, Sekharipuram R. Narayanan, William Chun, Barbara Jeffries-Nakamura, Andrew Kindler, Gerald Halpert
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Patent number: 7416809Abstract: An improved direct liquid-feed fuel cell having a solid membrane electrolyte for electrochemical reactions of an organic fuel. Improvements in interfacing of the catalyst layer and the membrane and activating catalyst materials are disclosed.Type: GrantFiled: June 1, 2006Date of Patent: August 26, 2008Assignee: California Institute of TechnologyInventors: Sekharipuram R. Narayanan, Subbarao Surampudi
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Publication number: 20060216576Abstract: An improved direct liquid-feed fuel cell having a solid membrane electrolyte for electrochemical reactions of an organic fuel. Improvements in interfacing of the catalyst layer and the membrane and activating catalyst materials are disclosed.Type: ApplicationFiled: June 1, 2006Publication date: September 28, 2006Inventors: Sekharipuram Karayanan, Subbarao Surampudi
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Publication number: 20060204810Abstract: A liquid organic, fuel cell is provided which employs a solid electrolyte membrane. An organic fuel, such as a methanol/water mixture, is circulated past an anode of a cell while oxygen or air is circulated past a cathode of the cell. The cell solid electrolyte membrane is preferably fabricated from Nafion™. Additionally, a method for improving the performance of carbon electrode structures for use in organic fuel cells is provided wherein a high surface-area carbon particle/Teflon™-binder structure is immersed within a Nafion™/methanol bath to impregnate the electrode with Nafion™. A method for fabricating an anode for use in a organic fuel cell is described wherein metal alloys are deposited onto the electrode in an electro-deposition solution containing perfluorooctanesulfonic acid. A fuel additive containing perfluorooctanesulfonic acid for use with fuel cells employing a sulfuric acid electrolyte is also disclosed.Type: ApplicationFiled: May 5, 2006Publication date: September 14, 2006Inventors: Subbarao Surampudi, Sekharipuram Narayanan, Eugene Vamos, Harvey Frank, Gerald Halpert, George Olah, G. K. Prakash
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Publication number: 20060105210Abstract: Improvements to non-acid methanol fuel cells include new formulations for materials. The platinum and ruthenium are more exactly mixed together. Different materials are substituted for these materials. The backing material for the fuel cell electrode is specially treated to improve its characteristics. A special sputtered electrode is formed which is extremely porous.Type: ApplicationFiled: October 17, 2005Publication date: May 18, 2006Inventors: Subbarao Surampudi, Harvey Frank, Sekharipuram Narayanan, William Chun, Barbara Jeffries-Nakamura, Andrew Kindler, Gerald Halpert
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Publication number: 20060046133Abstract: Improvements to non acid methanol fuel cells include new formulations for materials. The platinum and ruthenium are more exactly mixed together. Different materials are substituted for these materials. The backing material for the fuel cell electrode is specially treated to improve its characteristics. A special sputtered electrode is formed which is extremely porous.Type: ApplicationFiled: September 1, 2004Publication date: March 2, 2006Inventors: Subbarao Surampudi, Harvey Frank, Sekharipuram Narayanan, William Chun, Barbara Jeffries-Nakamura, Andrew Kindler, Gerald Halpert
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Publication number: 20050214629Abstract: Coating materials for coating the electrodes of a fuel cell are disclosed. In one embodiment, the coating materials comprise perfluoroalkanesulfonic acids having the general formula F3C—(CF2)n—SO3H, wherein n ranges from 8 to 17. In another embodiment, the coating materials comprise perfluoroalkanesulfonimides having the general formula CnF2n+1SO2NHO2SF2m+1Cm, wherein the sum of m and n ranges from 8 to 17. These long chain sulfonic acids and imides impart improved electrode performance and decrease polarization.Type: ApplicationFiled: October 1, 2004Publication date: September 29, 2005Inventors: Sekharipuram Narayanan, Marshall Smart, Subbarao Surampudi, G. K. Prakash, Qun-jie Wang, George Olah
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Publication number: 20050042487Abstract: Improvements to non acid methanol fuel cells include new formulations for materials. The platinum and ruthenium are more exactly mixed together. Different materials are substituted for these materials. The backing material for the fuel cell electrode is specially treated to improve its characteristics. A special sputtered electrode is formed which is extremely porous.Type: ApplicationFiled: August 30, 2004Publication date: February 24, 2005Inventors: Subbarao Surampudi, Harvey Frank, Sekharipuram Narayanan, William Chun, Barbara Jeffries-Nakamura, Andrew Kindler, Gerald Halpert
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Publication number: 20050003254Abstract: Improvements to non acid methanol fuel cells include new formulations for materials. The platinum and ruthenium are more exactly mixed together. Different materials are substituted for these materials. The backing material for the fuel cell electrode is specially treated to improve its characteristics. A special sputtered electrode is formed which is extremely porous.Type: ApplicationFiled: March 9, 2004Publication date: January 6, 2005Inventors: Subbarao Surampudi, Harvey Frank, Sekharipuram Narayanan, William Chun, Barbara Jeffries-Nakamura, Andrew Kindler, Gerald Halpert
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Patent number: 6821659Abstract: A liquid organic, fuel cell is provided which employs a solid electrolyte membrane. An organic fuel, such as a methanol/water mixture, is circulated past an anode of a cell while oxygen or air is circulated past a cathode of the cell. The cell solid electrolyte membrane is preferably fabricated from Nafion™. Additionally, a method for improving the performance of carbon electrode structures for use in organic fuel cells is provided wherein a high surface-area carbon particle/Teflon™ binder structure is immersed within a Nafion™/methanol bath to impregnate the electrode with Nafion™. A method for fabricating an anode for use in a organic fuel cell is described wherein metal alloys are deposited onto the electrode in an electro-deposition solution containing perfluorooctanesulfonic acid. A fuel additive containing perfluorooctanesulfonic acid for use with fuel cells employing a sulfuric acid electrolyte is also disclosed.Type: GrantFiled: June 13, 2001Date of Patent: November 23, 2004Assignees: California Institute of Technology, University of Southern CaliforniaInventors: Subbarao Surampudi, Sekharipuram R. Narayanan, Eugene Vamos, Harvey A. Frank, Gerald Halpert, George A. Olah, G. K. Surya Prakash
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Publication number: 20040224214Abstract: A liquid organic, fuel cell is provided which employs a solid electrolyte membrane. An organic fuel, such as a methanol/water mixture, is circulated past an anode of a cell while oxygen or air is circulated past a cathode of the cell. The cell solid electrolyte membrane is preferably fabricated from Nafion™. Additionally, a method for improving the performance of carbon electrode structures for use in organic fuel cells is provided wherein a high surface-area carbon particle/Teflon™-binder structure is immersed within a Nafion™/methanol bath to impregnate the electrode with Nafion™. A method for fabricating an anode for use in a organic fuel cell is described wherein metal alloys are deposited onto the electrode in an electro-deposition solution containing perfluorooctanesulfonic acid. A fuel additive containing perfluorooctanesulfonic acid for use with fuel cells employing a sulfuric acid electrolyte is also disclosed.Type: ApplicationFiled: May 27, 2004Publication date: November 11, 2004Inventors: Eugene Vamos, Subbarao Surampudi, Sekharipuram R. Narayanan, Harvey A. Frank, Gerald Halpert, George A. Olah, G. K. Surya Prakash
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Patent number: 6740434Abstract: A liquid organic, fuel cell is provided which employs a solid electrolyte membrane. An organic fuel, such as a methanol/water mixture, is circulated past an anode of a cell while oxygen or air is circulated past a cathode of the cell. The cell solid electrolyte membrane is preferably fabricated from Nafion™. Additionally, a method for improving the performance of carbon electrode structures for use in organic fuel cells is provided wherein a high surface-area carbon particle/Teflon™-binder structure is immersed within a Nafion™/methanol bath to impregnate the electrode with Nafion™. A method for fabricating an anode for use in a organic fuel cell is described wherein metal alloys are deposited onto the electrode in an electro-deposition solution containing perfluorooctanesulfonic acid. A fuel additive containing perfluorooctanesulfonic acid for use with fuel cells employing a sulfuric acid electrolyte is also disclosed.Type: GrantFiled: June 13, 2001Date of Patent: May 25, 2004Assignee: California Institute of TechnologyInventors: Subbarao Surampudi, Sekharipuram R. Narayanan, Eugene Vamos, Harvey A. Frank, Gerald Halpert, George A. Olah, G. K. Surya Prakash
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Patent number: 6703150Abstract: Improvements to non acid methanol fuel cells include new formulations for materials. The platinum and ruthenium are more exactly mixed together. Different materials are substituted for these materials. The backing material for the fuel cell electrode is specially treated to improve its characteristics. A special sputtered electrode is formed which is extremely porous.Type: GrantFiled: June 27, 2001Date of Patent: March 9, 2004Assignee: California Institute of TechnologyInventors: Subbarao Surampudi, Harvey A. Frank, Sekharipuram R. Narayanan, William Chun, Barbara Jeffries-Nakamura, Andrew Kindler, Gerald Halpert
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Patent number: 6589684Abstract: Improvements to non acid methanol fuel cells include new formulations for materials. The platinum and ruthenium are more exactly mixed together. Different materials are substituted for these materials. The backing material for the fuel cell electrode is specially treated to improve its characteristics. A special sputtered electrode is formed which is extremely porous.Type: GrantFiled: October 29, 1999Date of Patent: July 8, 2003Assignee: California Institute of TechnologyInventors: Subbarao Surampudi, Harvey A. Frank, Sekharipuram R. Narayanan, William Chun, Barbara Jeffries-Nakamura, Andrew Kindler, Gerald Halpert
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Patent number: 6492064Abstract: Multi-component organic solvent systems, electrolytes and electrochemical cells characterized by good low temperature performance are provided. In one embodiment, an improved organic solvent system contains a ternary mixture of ethylene carbonate, dimethyl carbonate and diethyl carbonate. In other embodiments, quaternary systems include a fourth component, i.e, an aliphatic ester, an asymmetric alkyl carbonate or a compound of the formula LiOX, where X is R, COOR, or COR, where R is alkyl or fluoroalkyl. Electrolytes based on such organic solvent systems are also provided and contain therein a lithium salt of high ionic mobility, such as LiPF6. Reversible electrochemical cells, particularly lithium ion cells, are constructed with the improved electrolytes, and preferably include a carbonaceous anode, an insertion type cathode, and an electrolyte interspersed therebetween.Type: GrantFiled: May 3, 1999Date of Patent: December 10, 2002Assignee: California Institute of TechnologyInventors: Marshall C. Smart, Ratnakumar V. Bugga, Subbarao Surampudi, Chen-Kuo Huang
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Patent number: 6420059Abstract: Improvements to non acid methanol fuel cells include new formulations for materials. The platinum and ruthenium are more exactly mixed together. Different materials are substituted for these materials. The backing material for the fuel cell electrode is specially treated to improve its characteristics. A special sputtered electrode is formed which is extremely porous.Type: GrantFiled: November 4, 1999Date of Patent: July 16, 2002Assignee: California Institute of TechnologyInventors: Subbarao Surampudi, Harvey A. Frank, Sekharipuram R. Narayanan, William Chun, Barbara Jeffries-Nakamura, Andrew Kindler, Gerald Halpert
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Patent number: 6391486Abstract: An improved direct liquid-feed fuel cell having a solid membrane electrolyte for electrochemical reactions of an organic fuel. Improvements in interfacing of the catalyst layer and the membrane and activating catalyst materials are disclosed.Type: GrantFiled: May 4, 1999Date of Patent: May 21, 2002Assignee: California Institute of TechnologyInventors: Sekharipuram Narayanan, Subbarao Surampudi