Patents by Inventor Karthik Ramaswami
Karthik Ramaswami 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: 20220370952Abstract: Embodiments of the present disclosure are directed to systems and methods for removing formaldehyde from indoor air. Some embodiments include flowing an indoor airflow over and/or through a solid supported amine filtering medium, such that, at least a portion of formaldehyde entrained in the indoor airflow is removed therefrom. Some other embodiments include systems having one or more fans for providing velocity to one and/or another airflows (e.g., airflows to/from a formaldehyde filter).Type: ApplicationFiled: July 11, 2022Publication date: November 24, 2022Inventors: Udi MEIRAV, Israel BIRAN, Karthik RAMASWAMI, Shira ROSENCWAIG
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Publication number: 20190314756Abstract: Embodiments of the present disclosure are directed to systems and methods for removing formaldehyde from indoor air. Some embodiments include flowing an indoor airflow over and/or through a solid supported amine filtering medium, such that, at least a portion of formaldehyde entrained in the indoor airflow is removed therefrom. Some other embodiments include systems having one or more fans for providing velocity to one and/or another airflows (e.g., airflows to/from a formaldehyde filter).Type: ApplicationFiled: January 11, 2019Publication date: October 17, 2019Applicant: enVerid Systems, Inc.Inventors: Udi MEIRAV, Israel BIRAN, Karthik RAMASWAMI, Shira ROSENCWAIG
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Publication number: 20160228811Abstract: Embodiments of the present disclosure are directed to systems and methods for removing formaldehyde from indoor air. Some embodiments include flowing an indoor airflow over and/or through a solid supported amine filtering medium, such that, at least a portion of formaldehyde entrained in the indoor airflow is removed therefrom. Some other embodiments include systems having one or more fans for providing velocity to one and/or another airflows (e.g., airflows to/from a formaldehyde filter).Type: ApplicationFiled: September 16, 2014Publication date: August 11, 2016Inventors: Udi MEIRAV, Israel BIRAN, Karthik RAMASWAMI, Shira ROSENCWAIG
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Patent number: 7931981Abstract: The present invention relates to a high capacity electrochemical cell having a cathode containing an oxide of copper as an active material, as well as an anode, an electrolyte, and separators for use with the cathodes of the invention in an alkaline electrochemical cell.Type: GrantFiled: October 20, 2009Date of Patent: April 26, 2011Assignee: Rovcal Inc.Inventors: David Boone, William C. Bushong, Paul Cheeseman, Gregory J. Davidson, Mario Destephen, Zhihong Jin, Jon Luecke, Erik Mortensen, Ernest Ndzebet, Karthik Ramaswami, Sergiy V. Sazhin, Viet H. Vu
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Patent number: 7807296Abstract: The present invention relates to a copper-manganese mixed oxide cathode material, which is suitable for use in a cathode of an electrochemical cell, and which has the formula MnxCuyOz.nH2O, wherein the oxidation state of Cu is between about +1 and about +3, the oxidation state of Mn is between about +2 and about +7, x is equal to about 3-y, y is less than about 3, z is calculated or experimentally determined, using means known in the art, based on the values of x and y, as well as the oxidation states of Mn and Cu, and nH2O represents the surface and structural water present in the mixed oxide material. The present invention further relates to an electrochemical cell comprising the noted cathode material.Type: GrantFiled: August 23, 2007Date of Patent: October 5, 2010Assignee: Roval, Inc.Inventors: Viet H. Vu, Ernest Ndzebet, Akshaya Kumar, Deborah Gilbert, William C. Bushong, Karthik Ramaswami, Juergen Scherer
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Patent number: 7763384Abstract: The present invention relates to a high capacity electrochemical cell including an anode, a cathode, and a separator disposed between the anode and cathode. The anode is configured to operate in combination with a quantity of an oxide of copper in the cathode. The cell is capable of operating at a discharge voltage greater than 1.05 volts for at least an initial 5% of a cell discharge period at a current density of at least 5 mA/g, and can include a cathode active material that includes an oxide of copper.Type: GrantFiled: August 9, 2004Date of Patent: July 27, 2010Assignee: Rovcal, Inc.Inventors: David Boone, William C. Bushong, Paul Cheeseman, Gregory J Davidson, Mario Destephen, Zihong Jin, Jon Luecke, Erik Mortensen, Ernest Ndzebet, Karthik Ramaswami, Sergey Sazhin, Viet H. Vu
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Patent number: 7740984Abstract: Aspects of the present invention provide a high capacity electrochemical cell having an anode, a cathode, and a separator disposed between the anode and cathode. The cathode includes a mixture having a first component, a second component and a third component. The first component includes a first element, the second component includes a second element, and the third component includes the first element and the second element. The mixture can, for instance, be a mixed metal oxide. The separator is configured to provide suitable ionic transport between the anode and the cathode.Type: GrantFiled: February 8, 2005Date of Patent: June 22, 2010Assignee: Rovcal, Inc.Inventors: William C. Bushong, Paul Cheeseman, Zhihong Jin, Erik Mortensen, Ernest Ndzebet, Karthik Ramaswami, Viet H. Vu, Deborah Gilbert, Juergen Scherer
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Publication number: 20100112431Abstract: The present invention relates to a high capacity electrochemical cell having a cathode containing an oxide of copper as an active material, as well as an anode, an electrolyte, and separators for use with the cathodes of the invention in an alkaline electrochemical cell.Type: ApplicationFiled: October 20, 2009Publication date: May 6, 2010Applicant: Rovcal Inc.Inventors: David Boone, Wiliam C. Bushong, Paul Cheeseman, Gregory J. Davidson, Mario Destephen, Zihong Jin, Jon Luecke, Erik Mortensen, Ernest Ndzebet, Karthik Ramaswami, Sergey Sazhin, Viet H. Vu
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Patent number: 7645540Abstract: The present invention relates to a high capacity electrochemical cell having a cathode containing an oxide of copper as an active material, as well as an anode, an electrolyte, and separators for use with the cathodes of the invention in an alkaline electrochemical cell.Type: GrantFiled: August 9, 2004Date of Patent: January 12, 2010Assignee: Rovcal, Inc.Inventors: David Boone, William C. Bushong, Paul Cheeseman, Gregory J. Davidson, Mario Destephen, Zhihong Jin, Jon Luecke, Erik Mortensen, Ernest Ndzebet, Karthik Ramaswami, Sergey Sazhin, Viet H. Vu
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Publication number: 20090081501Abstract: The present disclosure generally relates to an on-demand hydrogen gas generation device, suitable for use in a fuel cell, which utilizes water electrolysis, and more particularly galvanic cell corrosion, and/or a chemical hydride reaction, to produce hydrogen gas. The present disclosure additionally relates to such a device that comprises a switching mechanism that has an electrical current passing therethrough and that repeatedly and reversibly moves between a first position and a second position when exposed to pressure differential resulting from hydrogen gas generation, in order to (1) alter the rate at which hydrogen gas is generated, such that hydrogen gas is generated on an as-needed basis for a fuel cell connected thereto, and/or (2) ensure a substantially constant flow of hydrogen gas is released therefrom.Type: ApplicationFiled: July 22, 2008Publication date: March 26, 2009Applicant: ROVCAL, INC.Inventors: Viet Vu, Zhihong Jin, Juergen Scherer, Joseph L. Passaniti, Gregory J. Davidson, Craig Rom, Mario DeStephen, Jon Luecke, Erik Mortensen, Jamie L. Ostroha, Karthik Ramaswami, Tony Rubsam, William C. Bushong
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Publication number: 20090081497Abstract: The present disclosure generally relates to an on-demand hydrogen gas generation device, suitable for use in a fuel cell, which utilizes water electrolysis, and more particularly galvanic cell corrosion, and/or a chemical hydride reaction, to produce hydrogen gas. The present disclosure additionally relates to such a device that comprises a switching mechanism that has an electrical current passing therethrough and that repeatedly and reversibly moves between a first position and a second position when exposed to pressure differential resulting from hydrogen gas generation, in order to (1) alter the rate at which hydrogen gas is generated, such that hydrogen gas is generated on an as-needed basis for a fuel cell connected thereto, and/or (2) ensure a substantially constant flow of hydrogen gas is released therefrom.Type: ApplicationFiled: July 22, 2008Publication date: March 26, 2009Applicant: Rovcal, IncInventors: Viet Vu, Zhihong Jin, Juergen Scherer, Joseph L. Passaniti, Gregory J. Davidson, Craig Rom, Mario DeStephen, Jon Luecke, Erik Mortensen, Jamie L. Ostroha, Karthik Ramaswami, Tony Rubsam, William C. Bushong
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Publication number: 20090078568Abstract: The present disclosure generally relates to an on-demand hydrogen gas generation device, suitable for use in a fuel cell, which utilizes water electrolysis, and more particularly galvanic cell corrosion, and/or a chemical hydride reaction, to produce hydrogen gas. The present disclosure additionally relates to such a device that comprises a switching mechanism that has an electrical current passing therethrough and that repeatedly and reversibly moves between a first position and a second position when exposed to pressure differential resulting from hydrogen gas generation, in order to (1) alter the rate at which hydrogen gas is generated, such that hydrogen gas is generated on an as-needed basis for a fuel cell connected thereto, and/or (2) ensure a substantially constant flow of hydrogen gas is released therefrom.Type: ApplicationFiled: July 22, 2008Publication date: March 26, 2009Applicant: ROVCAL, INC.Inventors: Karthik Ramaswami, Zhihong Jin, Erik Mortensen, Gregory J. Davidson, Mario DeStephen, Joseph L. Passaniti, Jon Luecke, Jamie L. Ostroha, Tony Rubsam, Juergen Scherer, Viet Vu, William C. Bushong
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Publication number: 20080090138Abstract: The present invention relates to a copper-manganese mixed oxide cathode material, which is suitable for use in a cathode of an electrochemical cell, and which has the formula MnxCuyOz,.nH2O, wherein the oxidation state of Cu is between about +1 and about +3, the oxidation state of Mn is between about +2 and about +7, x is equal to about 3?y, y is less than about 3, z is calculated or experimentally determined, using means known in the art, based on the values of x and y, as well as the oxidation states of Mn and Cu, and nH2O represents the surface and structural water present in the mixed oxide material. The present invention further relates to an electrochemical cell comprising an anode, a cathode, and a separator disposed between the anode and cathode, and an electrolyte in fluid communication with the anode, the cathode and the separator, wherein the cathode comprises the noted cathode material.Type: ApplicationFiled: August 23, 2007Publication date: April 17, 2008Applicant: ROVCAL, INC.Inventors: Viet Vu, Ernest Ndzebet, Akshaya Padhi, Deborah Gilbert, William Bushong, Karthik Ramaswami, Juergen Scherer
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Publication number: 20080038634Abstract: An electrochemical cell is provided that includes a container, a cathode and anode disposed in the container, and a separator disposed between the anode and cathode. The cell further includes an extender either included in or separate from the cathode. An agent is further provided that interacts with soluble ionic species generated in the cathode to prevent the migration of the species to the anode.Type: ApplicationFiled: December 10, 2004Publication date: February 14, 2008Applicant: Rovcal, Inc.Inventors: William C. Bushong, Paul Cheeseman, Gregory J. Davidson, Zihong Jin, Erik Mortensen, Ernest Ndzebet, Karthik Ramaswami, Viet H. Vu
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Publication number: 20070257016Abstract: The present disclosure generally relates to a device for dispensing a volatile active material that may be direct current (DC) (batteries, fuel cells, solar cells, and the like) powered or chemically powered. More particularly, the present disclosure relates to a battery operated insect repellant device that is easily portable and is capable of providing a sufficient vaporous stream of a volatile insecticide and/or other active agent, to protect a user. The battery operated insect repellant device is configured to operate at high efficiency such that a high percentage of battery energy input into the device is converted to heat used to volatilize the insecticide or other active agent.Type: ApplicationFiled: May 1, 2007Publication date: November 8, 2007Applicant: ROVCAL, INC.Inventors: Zhihong Jin, William Bushong, Gregory Davidson, Joseph Passaniti, Karthik Ramaswami, Viet Vu
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Publication number: 20060183019Abstract: Electrochemical cells comprising an anode, a cathode, a container, and a separator are disclosed. At least a portion of the separator is covered by an adhesive material that is bonded to the container or a sealing assembly. The adhesive material provides a mechanical bond between the separator and the container or sealing assembly, and acts to minimize or prevent physical and chemical transport from the anode to the cathode and vice versa. The adhesive material provides a means to utilize thin separators in an electrochemical cell without compromising the shelf life or reliability of the cell. The inhibition of the species migration with the electrochemical cell substantially minimizes or eliminates shorting within the cell or the degradation of shelf life of the cell by limiting the migration of soluble species that can foul one or both electrodes.Type: ApplicationFiled: February 15, 2005Publication date: August 17, 2006Applicant: Rovcal, Inc.Inventors: Gregory Davidson, Andreas Winardi, Karthik Ramaswami, Erik Mortensen
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Publication number: 20060183020Abstract: In an electrochemical cell a container houses a cathode, an anode, a separator between the cathode and the anode, a negative current collector and a sealing assembly for sealing a terminal end of the separator extending outward from between the cathode and the anode. The sealing assembly seals the terminal end of the separator between a first sealing member in sealing relationship with the first face of the separator terminal end and a second sealing member in sealing relationship with the second face of the separator terminal end. In another embodiment, the sealing assembly seals the terminal end of the separator between the sealing assembly in sealing relationship with the first face of the separator terminal end and at least one of the cathode, the anode and the container in sealing relationship with the second face of the separator terminal end.Type: ApplicationFiled: February 15, 2005Publication date: August 17, 2006Applicant: Rovcal, Inc.Inventors: Gregory Davidson, Viet Vu, Tom Kaufman, Karthik Ramaswami
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Publication number: 20050271941Abstract: Aspects of the present invention provide a high capacity electrochemical cell having an anode, a cathode, and a separator disposed between the anode and cathode. The cathode includes a mixture having a first component, a second component and a third component. The first component includes a first element, the second component includes a second element, and the third component includes the first element and the second element. The mixture can, for instance, be a mixed metal oxide. The separator is configured to provide suitable ionic transport between the anode and the cathode.Type: ApplicationFiled: February 8, 2005Publication date: December 8, 2005Inventors: William Bushong, Paul Cheeseman, Zhihong Jin, Erik Mortensen, Ernest Ndzebet, Karthik Ramaswami, Viet Vu, Deborah Gilbert, Juergen Scherer
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Publication number: 20050084755Abstract: The present invention relates to a high capacity electrochemical cell including a cathode that can contain an oxide of copper as an active material, an anode, an electrolyte, and a separator disposed between the anode and the cathode. The oxide can have surface area greater than 0.5 m2/g, and the cathode can include an additive that increases the discharge voltage of the cell. In some cases the additive has a lower voltage than the oxide alone. The additive can have a surface area within the range defined by a lower limit of 0.5 m2/g and an upper limit of 100 m2/g. The anode can include a quantity of mercury below 0.025%.Type: ApplicationFiled: August 9, 2004Publication date: April 21, 2005Inventors: David Boone, William Bushong, Paul Cheeseman, Gregory Davidson, Mario Destephen, Zihong Jin, Jon Luecke, Erik Mortensen, Ernest Ndzebet, Karthik Ramaswami, Sergey Sazhin, Viet Vu
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Publication number: 20050079415Abstract: The present invention relates to a high capacity electrochemical cell including an anode, a cathode, and a separator disposed between the anode and cathode. The anode is configured to operate in combination with a quantity of an oxide of copper in the cathode. The cell is capable of operating at a discharge voltage greater than 1.05 volts for at least an initial 5 % of a cell discharge period at a current density of at least 5 mA/g, and can include a cathode active material that includes an oxide of copper.Type: ApplicationFiled: August 9, 2004Publication date: April 14, 2005Inventors: David Boone, William Bushong, Paul Cheeseman, Gregory Davidson, Mario Destephen, Zihong Jin, Jon Luecke, Erik Mortensen, Ernest Ndzebet, Karthik Ramaswami, Sergey Sazhin, Viet Vu