Patents by Inventor Kevin Fok
Kevin Fok 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).
-
Patent number: 7018740Abstract: Fuel cell oxygen electrode and instant startup fuel cells employing such oxygen electrode. The oxygen electrode operates through the mechanism of redox couples which uniquely provide multiple degrees of freedom in selecting the operating voltages available for such fuel cells. Such oxygen electrodes provide the fuel cells in which they are used a “buffer” or “charge” of oxidizer available within the oxygen electrode at all times.Type: GrantFiled: September 16, 2003Date of Patent: March 28, 2006Assignee: Texaco Ovonic Fuel Cell LLCInventors: Stanford R. Ovshinsky, Srinivasan Venkatesan, Boyko Aladjov, Subhash K. Dhar, Kevin Fok, Thomas Hopper
-
Publication number: 20050271928Abstract: A Proton Exchange Membrane fuel cell including a hydrogen electrode utilizing non-noble metal hydrogen oxidation catalysts, and/or an oxygen electrode utilizing non-noble metal oxygen reduction catalysts. The non-noble metal hydrogen oxidation catalysts and the non-noble metal oxygen reduction catalysts provide for a long catalyst cycle life due to increased stability and poisoning resistance in an acidic environment.Type: ApplicationFiled: June 7, 2004Publication date: December 8, 2005Inventors: Stanford Ovshinsky, Srinivasan Venkatesan, Hong Wang, Konstantin Petrov, Kevin Fok
-
Patent number: 6926986Abstract: A fuel cell utilizing parallel flow of a hydrogen stream, an oxygen stream, and an electrolyte solution with respect to the electrodes, while maintaining mechanical support within the fuel cell. The fuel cell utilizes encapsulated electrodes to maintain a high air flow rate and low pressure throughout the fuel cell. The fuel cell is also designed to maintain mechanical support within the fuel cell while the electrodes expand and contract in response to the absorption of oxygen and hydrogen. Gas is predistributed by the compression plates and electrode plates to supply the electrodes with high concentrations of oxygen from air.Type: GrantFiled: May 9, 2002Date of Patent: August 9, 2005Assignee: Energy Conversion DevicesInventors: Stanford R. Ovshinsky, Ana Menjak, Thomas Hopper, Zdravko Menjak, Kevin Fok, Boyko Aladjov, Srinivasan Venkatesan, Subhash K. Dhar
-
Publication number: 20050147884Abstract: An active electrode composition comprising a nickel hydroxide material and a pectin. Preferably, the pectin comprises a citrus pectin.Type: ApplicationFiled: November 15, 2004Publication date: July 7, 2005Inventors: Srinivasan Venkatesan, Boyko Aladjov, Kevin Fok, Thomas Hopper, Stanford Ovshinsky
-
Publication number: 20050042495Abstract: A fuel cell utilizing parallel flow of a hydrogen stream, an oxygen stream, and an electrolyte solution with respect to the electrodes, while maintaining mechanical support within the fuel cell. The fuel cell utilizes encapsulated electrodes to maintain a high air flow rate and low pressure throughout the fuel cell. The fuel cell is also designed to maintain mechanical support within the fuel cell while the electrodes expand and contract in response to the absorption of oxygen and hydrogen. Gas is predistributed by the compression plates and electrode plates to supply the electrodes with high concentrations of oxygen from air.Type: ApplicationFiled: May 9, 2002Publication date: February 24, 2005Inventors: Stanford Ovshinsky, Ana Menjak, Thomas Hopper, Zdravko Menjak, Kevin Fok, Boyko Aladjov, Srinivasan Venkatesan, Subhash Dhar
-
Patent number: 6828057Abstract: A fuel cell utilizing parallel flow of a hydrogen stream, an oxygen stream, and an electrolyte solution with respect to the electrodes, while maintaining mechanical support within the fuel cell. The fuel cell utilizes framed electrodes to maintain a high air flow rate and low pressure throughout the fuel cell. The fuel cell is also designed to maintain mechanical support within the fuel cell while the electrodes expand and contract in response to the absorption of oxygen and hydrogen. Gas is predistributed by the compression plates and frames to supply the electrodes with high concentrations of oxygen from air.Type: GrantFiled: April 29, 2002Date of Patent: December 7, 2004Assignee: Energy Conversion Devices, Inc.Inventors: Stanford R. Ovshinsky, Ana Menjak, Tom Hopper, Zdravko Menjak, Kevin Fok, Boyko Aladjov, Srinivasan Venkatesan, Subhash K. Dhar
-
Patent number: 6818348Abstract: An active electrode composition comprising an active electrode material and a binder where the binder comprises a monosaccharide, a disaccharide, a pectin or a molasses. Preferably, the active electrode material is nickel hydroxide.Type: GrantFiled: February 10, 2000Date of Patent: November 16, 2004Assignee: Ovonic Battery Company, Inc.Inventors: Srinivasan Venkatesan, Boyko Aladjov, Kevin Fok, Thomas Hopper, Stanford R. Ovshinsky
-
Patent number: 6783891Abstract: Fuel cell oxygen electrode and instant startup fuel cells employing such oxygen electrode. The oxygen electrode operates through the mechanism of redox couples which uniquely provide multiple degrees of freedom in selecting the operating voltages available for such fuel cells. Such oxygen electrodes provide the fuel cells in which they are used a “buffer” or “charge” of oxidizer available within the oxygen electrode at all times.Type: GrantFiled: September 16, 2003Date of Patent: August 31, 2004Assignee: Energy Conversion Devices, Inc.Inventors: Stanford R. Ovshinsky, Srinivasan Venkatesan, Boyko Aladjov, Subhash Dhar, Kevin Fok, Thomas Hopper
-
Patent number: 6777125Abstract: Fuel cell oxygen electrode and instant startup fuel cells employing such oxygen electrode. The oxygen electrode operates through the mechanism of redox couples which uniquely provide multiple degrees of freedom in selecting the operating voltages available for such fuel cells. Such oxygen electrodes provide the fuel cells in which they are used a “buffer” or “charge” of oxidizer available within the oxygen electrode at all times.Type: GrantFiled: June 28, 2002Date of Patent: August 17, 2004Assignee: Energy Conversion Devices, Inc.Inventors: Stanford R. Ovhsinsky, Srinivasan Venkatesan, Boyko Aladjov, Subhash Dhar, Kevin Fok, Thomas Hopper
-
Publication number: 20040053109Abstract: Fuel cell oxygen electrode and instant startup fuel cells employing such oxygen electrode. The oxygen electrode operates through the mechanism of redox couples which uniquely provide multiple degrees of freedom in selecting the operating voltages available for such fuel cells. Such oxygen electrodes provide the fuel cells in which they are used a “buffer” or “charge” of oxidizer available within the oxygen electrode at all times.Type: ApplicationFiled: September 16, 2003Publication date: March 18, 2004Inventors: Stanford R. Ovshinsky, Srinivasan Venkatesan, Boyko Aladjov, Subhash K. Dhar, Kevin Fok, Thomas Hopper
-
Patent number: 6703156Abstract: Fuel cell oxygen electrode and instant startup fuel cells employing such oxygen electrode. The oxygen electrode operates through the mechanism of redox couples which uniquely provide multiple degrees of freedom in selecting the operating voltages available for such fuel cells. Such oxygen electrodes provide the fuel cells in which they are used a “buffer” or “charge” of oxidizer available within the oxygen electrode at all times.Type: GrantFiled: October 4, 2002Date of Patent: March 9, 2004Assignee: Texaco Ovonic Fuel Cell, LLCInventors: Stanford R. Ovshinsky, Srinivasan Venkatesan, Boyko Aladjov, Subhash K. Dhar, Kevin Fok, Thomas Hopper
-
Publication number: 20030203274Abstract: A fuel cell utilizing parallel flow of a hydrogen stream, an oxygen stream, and an electrolyte solution with respect to the electrodes, while maintaining mechanical support within the fuel cell. The fuel cell utilizes framed electrodes to maintain a high air flow rate and low pressure throughout the fuel cell. The fuel cell is also designed to maintain mechanical support within the fuel cell while the electrodes expand and contract in response to the absorption of oxygen and hydrogen. Gas is predistributed by the compression plates and frames to supply the electrodes with high concentrations of oxygen from air.Type: ApplicationFiled: April 29, 2002Publication date: October 30, 2003Inventors: Stanford R. Ovshinsky, Ana Menjak, Tom Hopper, Zdravko Menjak, Kevin Fok, Boyko Aladjov, Srinivasan Venkatesan, Subhash K. Dhar
-
Patent number: 6613471Abstract: A hydrogen storage alloy active material for the anode of Ovonic instant startup/regenerative fuel cells. The active material includes a hydrogen storage alloy material with a water reactive chemical hydride additive, which, upon utilization of the active material in an anode of an alkaline electrolyte fuel cell, gives the anode added benefits, not attainable by using hydrogen storage alloy material alone. These added benefits include 1) precharge of the hydrogen storage material with hydrogen; 2) higher porosity/increased surface area/reduced electrode polarization at high currents; 3) simplified, faster activation of the hydrogen storage alloy; and 4) optionally, enhanced corrosion protection for the hydrogen storage alloy.Type: GrantFiled: October 31, 2001Date of Patent: September 2, 2003Assignee: Energy Conversion Devices, Inc.Inventors: Stanford R. Ovshinsky, Boyko Aladjov, Srinivasan Venkatesan, Thomas Hopper, Kevin Fok, Subhash Dhar
-
Patent number: 6605375Abstract: A method of activating a hydrogen storage alloy electrode. The method comprises the step of applying current cycles to the electrode where each current cycle includes a forward pulse effective to at least partially charge the electrode and a reverse pulse effective to at least partially discharge the electrode.Type: GrantFiled: February 28, 2001Date of Patent: August 12, 2003Assignee: Ovonic Battery Company, Inc.Inventors: Stanford R. Ovshinsky, Boyko Aladjov, Srinivasan Venkatesan, Subhash K. Dhar, Thomas Hopper, Kevin Fok
-
Patent number: 6589686Abstract: A method of activating a metal hydride electrode of an alkaline fuel cell. The method comprises the step of applying current cycles to the anode where each current cycle includes a forward current effective to at least partially charge the electrode and a reverse current effective to at least partially discharge the electrode.Type: GrantFiled: January 8, 2002Date of Patent: July 8, 2003Assignee: Ovonic Battery Company, Inc.Inventors: Stanford R. Ovshinsky, Boyko Aladjov, Srinivasan Venkatesan, Subhash K. Dhar, Thomas Hopper, Kevin Fok
-
Publication number: 20030039879Abstract: Fuel cell oxygen electrode and instant startup fuel cells employing such oxygen electrode. The oxygen electrode operates through the mechanism of redox couples which uniquely provide multiple degrees of freedom in selecting the operating voltages available for such fuel cells. Such oxygen electrodes provide the fuel cells in which they are used a “buffer” or “charge” of oxidizer available within the oxygen electrode at all times.Type: ApplicationFiled: October 4, 2002Publication date: February 27, 2003Inventors: Stanford R. Ovshinsky, Srinivasan Venkatesan, Boyko Aladjov, Subhash K. Dhar, Kevin Fok, Thomas Hopper
-
Patent number: 6503659Abstract: A layered hydrogen absorbing alloy electrode for an alkaline electrochemical cell. The layered electrode comprises a outer layer comprising a metal oxide, metal sulfide or mixtures thereof. The outer layer reduces the internal pressure of electrochemical cell.Type: GrantFiled: July 13, 1999Date of Patent: January 7, 2003Assignee: Ovonic Battery Company, Inc.Inventors: Stanford R. Ovshinsky, Srinivasan Venkatesan, Boyko Aladjov, Kevin Fok, Thomas J. Hopper, Lynn Taylor
-
Publication number: 20020187394Abstract: Fuel cell oxygen electrode and instant startup fuel cells employing such oxygen electrode. The oxygen electrode operates through the mechanism of redox couples which uniquely provide multiple degrees of freedom in selecting the operating voltages available for such fuel cells. Such oxygen electrodes provide the fuel cells in which they are used a “buffer” or “charge” of oxidizer available within the oxygen electrode at all times.Type: ApplicationFiled: June 28, 2002Publication date: December 12, 2002Inventors: Stanford R. Ovhsinsky, Srinivasan Venkatesan, Boyko Aladjov, Subhash Dhar, Kevin Fok, Thomas Hopper
-
Patent number: 6492057Abstract: An alkaline electrochemical cell having a hydrogen absorbing alloy negative electrode. The electrochemical cell comprises an alkaline electrolyte comprising an additive material which reduces cell pressure by decreasing hydrogen gas evolution.Type: GrantFiled: April 14, 1999Date of Patent: December 10, 2002Assignee: Ovonic Battery Company, Inc.Inventors: Stanford R. Ovshinsky, Srinivasan Venkatesan, Boyko Alajov, Kevin Fok, Thomas J. Hopper, James L. Strebe
-
Publication number: 20020127466Abstract: A method of activating a metal hydride electrode of an alkaline fuel cell. The method comprises the step of applying current cycles to the anode where each current cycle includes a forward current effective to at least partially charge the electrode and a reverse current effective to at least partially discharge the electrode.Type: ApplicationFiled: January 8, 2002Publication date: September 12, 2002Inventors: Stanford R. Ovshinsky, Boyko Aladjov, Srinivasan Venkatesan, Subhash K. Dhar, Thomas Hopper, Kevin Fok