Patents by Inventor Johna Leddy

Johna Leddy 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).

  • Publication number: 20040234767
    Abstract: New magnetic materials and new metallic particles, new methods of making and using same, for example, to prepare magnetically modified electrodes and fuel cells, and coated metallic particles in general. The present invention discloses methods of preparation of cheaper and more uniformly sized magnetic and metallic microparticles formed from the exemplary materials magnetite, nickel, samarium cobalt and neodymium iron boron. In addition, the present invention discloses methodology for preparation and use of coated magnetic and metallic microparticles, in particular, exemplary siloxyl coating of magnetic particles, metallic particles, and magnetic and metallic microparticles with an exemplary silane, 3-aminopropyltrimethoxysilane, that is cross linked thereon. In addition, methods and results are described for preparing and using larger siloxyl coated samarium cobalt milliparticles.
    Type: Application
    Filed: June 23, 2004
    Publication date: November 25, 2004
    Inventors: Johna Leddy, Shelly D Minteer, Wayne L. Gellett
  • Publication number: 20040137283
    Abstract: Disclosed are magnetically modified electrodes containing at least one catalyst component that mediates a subatomic particle transfer process. Also disclosed are magnetically modified electrodes containing metalloproteins (metalloenzymes).
    Type: Application
    Filed: October 20, 2003
    Publication date: July 15, 2004
    Inventors: Johna Leddy, Chaminda Hettige
  • Publication number: 20040131889
    Abstract: The present invention is directed to methods for making magnetically modified electrodes and electrodes made according to the method. Such electrodes are useful as electrodes in batteries, such as Ni—MH batteries, Ni—Cd batteries, Ni—Zn batteries and Ni—Fe batteries.
    Type: Application
    Filed: September 16, 2003
    Publication date: July 8, 2004
    Inventors: Johna Leddy, Pengcheng Zou
  • Publication number: 20040053416
    Abstract: The present invention is directed to methods for determining electron transfer rates in systems involving metalloproteins. Metalloprotein/substrate electron transfer rates as well as metalloprotein self exchange rates may be modeled. Such electron transfer rates are useful in smart drug design and enzyme engineering.
    Type: Application
    Filed: April 3, 2003
    Publication date: March 18, 2004
    Inventors: Johna Leddy, Shelley D. Minteer
  • Publication number: 20040026253
    Abstract: The present invention is directed to methods for making magnetically modified electrodes and electrodes made according to the method. Such electrode are useful as electrodes in batteries, such as Ni-MH batteries, Ni—Cd batteries, Ni—Zn batteries and Ni—Fe batteries.
    Type: Application
    Filed: April 3, 2003
    Publication date: February 12, 2004
    Inventors: Johna Leddy, Shelley D. Minteer
  • Publication number: 20030232223
    Abstract: The present invention is directed to methods for making magnetically modified electrodes and electrodes made according to the method. Such electrode are useful as electrodes in batteries, such as Ni-MH batteries, Ni—Cd batteries, Ni—Zn batteries and Ni—Fe batteries.
    Type: Application
    Filed: February 3, 2003
    Publication date: December 18, 2003
    Inventors: Johna Leddy, Pengcheng Zou
  • Patent number: 6514575
    Abstract: Magnetic composites exhibit distinct flux properties due to gradient interfaces. The composites can be used to improve fuel cells and effect transport and separation of different species of materials. A variety of devices can be made utilizing the composites including a separator, a cell, an electrode for channeling flux of magnetic species, an electrode for effecting electrolysis of magnetic species, a system for channeling electrolyte species, a system for separating particles with different magnetic susceptibilities. Some composites can be used to make a dual sensor for distinguishing between two species of materials and a flux switch to regulate the flow of a redox species and a flux switch to regulate the flow of a chemical species. Some composites can control chemical species transport and distribution.
    Type: Grant
    Filed: June 8, 2001
    Date of Patent: February 4, 2003
    Assignee: University of Iowa Research Foundation
    Inventors: Johna Leddy, Sudath Amarasinghe
  • Patent number: 6479176
    Abstract: Magnetic composites exhibit distinct flux properties due to gradient interfaces. The composites can be used to improve fuel cells and batteries and effect transport and separation of different species of materials, for example, transition metal species such as lanthanides and actinides. A variety of devices can be made utilizing the composites including a separator, an electrode for channeling flux of magnetic species, an electrode for effecting electrolysis of magnetic species, a system for channeling electrolyte species, a system for separating particles with different magnetic susceptibilities, improved fuel cells, batteries, and oxygen concentrators. Some composites can be used to make a separator for distinguishing between two species of materials and a flux switch to regulate the flow of a chemical species. Some composites can control chemical species transport and distribution. Other composites enable ambient pressure fuel cells having enhanced performance and reduced weight to be produced.
    Type: Grant
    Filed: June 29, 2001
    Date of Patent: November 12, 2002
    Assignee: University of Iowa Research Foundation
    Inventors: Johna Leddy, Sudath Amarasinghe, Lois Anne Zook
  • Patent number: 6375885
    Abstract: A method for coating a surface with a magnetic composite material exhibiting distinct flux properties due to gradient interfaces within the composite. Surfaces coated with such a composite can be used to improve fuel cells and to effect improved transport and separation of different species of materials. A wide variety of devices can incorporate such composite-coated surfaces, including separators, fuel cells, electrochemical cells, and electrodes for channeling flux of, or for effecting electrolysis of, magnetic species.
    Type: Grant
    Filed: July 27, 1998
    Date of Patent: April 23, 2002
    Assignee: The University of Iowa Research Foundation
    Inventors: Johna Leddy, Sudath Amarasinghe
  • Patent number: 6355166
    Abstract: Materials and methods for making and using magnetically enhanced composite materials are provided. Surfaces coated with such composites can be used to improve fuel cells, material separators, and other applications. A variety of devices can incorporate such composites, including fuel cells, separators, batteries, and electrodes that effect electrolysis of magnetic species.
    Type: Grant
    Filed: October 29, 1999
    Date of Patent: March 12, 2002
    Assignee: The University of Iowa Research Foundation
    Inventors: Sudath Amarasinghe, Shelley Minteer, Lois Anne Zook, Drew C. Dunwoody, Catherine Spolar, Hachull Chung, Johna Leddy
  • Publication number: 20020012821
    Abstract: Magnetic composites exhibit distinct flux properties due to gradient interfaces. The composites can be used to improve fuel cells and batteries and effect transport and separation of different species of materials, for example, transition metal species such as lanthanides and actinides. A variety of devices can be made utilizing the composites including a separator, an electrode for channeling flux of magnetic species, an electrode for effecting electrolysis of magnetic species, a system for channeling electrolyte species, a system for separating particles with different magnetic susceptibilities, improved fuel cells, batteries, and oxygen concentrators. Some composites can be used to make a separator for distinguishing between two species of materials and a flux switch to regulate the flow of a chemical species. Some composites can control chemical species transport and distribution. Other composites enable ambient pressure fuel cells having enhanced performance and reduced weight to be produced.
    Type: Application
    Filed: June 29, 2001
    Publication date: January 31, 2002
    Applicant: UNIVERSITY OF IOWA RESEARCH FOUNDATION
    Inventors: Johna Leddy, Sudath Amarasinghe, Lois Anne Zook
  • Publication number: 20020004106
    Abstract: Magnetic composites exhibit distinct flux properties due to gradient interfaces. The composites can be used to improve fuel cells and effect transport and separation of different species of materials. A variety of devices can be made utilizing the composites including a separator, a cell, an electrode for channeling flux of magnetic species, an electrode for effecting electrolysis of magnetic species, a system for channeling electrolyte species, a system for separating particles with different magnetic susceptibilities. Some composites can be used to make a dual sensor for distinguishing between two species of materials and a flux switch to regulate the flow of a redox species and a flux switch to regulate the flow of a chemical species. Some composites can control chemical species transport and distribution.
    Type: Application
    Filed: June 8, 2001
    Publication date: January 10, 2002
    Inventors: Johna Leddy, Sudath Amarasinghe
  • Patent number: 6322676
    Abstract: Magnetic composites exhibit distinct flux properties due to gradient interfaces. The composites can be used to improve fuel cells and effect transport and separation of different species of materials. A variety of devices can be made utilizing the composites including a separator, a cell, an electrode for channeling flux of magnetic species, an electrode for effecting electrolysis of magnetic species, a system for channeling electrolyte species, a system for separating particles with different magnetic susceptibilities. Some composites can be used to make a dual sensor for distinguishing between two species of materials and a flux switch to regulate the flow of a redox species and a flux switch to regulate the flow of a chemical species. Some composites can control chemical species transport and distribution.
    Type: Grant
    Filed: March 25, 1998
    Date of Patent: November 27, 2001
    Assignee: University of Iowa Research Foundation
    Inventors: Johna Leddy, Sudath Amarasinghe
  • Patent number: 6303242
    Abstract: Magnetic composites exhibit distinct flux properties due to gradient interfaces. The composites can be used to improve fuel cells and batteries and effect transport and separation of different species of materials, for example, transition metal species such as lanthanides and actinides. A variety of devices can be made utilizing the composites including a separator, an electrode for channeling flux of magnetic species, an electrode for effecting electrolysis of magnetic species, a system for channeling electrolyte species, a system for separating particles with different magnetic susceptibilities, improved fuel cells, batteries, and oxygen concentrators. Some composites can be used to make a separator for distinguishing between two species of materials and a flux switch to regulate the flow of a chemical species. Some composites can control chemical species transport and distribution. Other composites enable ambient pressure fuel cells having enhanced performance and reduced weight to be produced.
    Type: Grant
    Filed: December 10, 1999
    Date of Patent: October 16, 2001
    Assignee: The University of Iowa Research Foundation
    Inventors: Johna Leddy, Sudath Amarasinghe, Lois Anne Zook
  • Patent number: 6207313
    Abstract: Magnetic composites exhibit distinct flux properties due to gradient interfaces. The composites can be used to improve fuel cells and batteries and effect transport and separation of different chemical species. Devices utilizing the composites include an electrode and improved fuel cells and batteries. Some composites, disposed on the surface of electrodes, prevent passivation of those electrodes and enable direct reformation of liquid fuels. Methods involving these composites provide distinct ways for these composites to be utilized.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: March 27, 2001
    Assignee: The University of Iowa Research Foundation
    Inventors: Johna Leddy, Lois Anne Zook, Sudath Amarasinghe
  • Patent number: 6001248
    Abstract: Magnetic composites exhibit distinct flux properties due to gradient interfaces. The composites can be used to improve fuel cells and batteries and effect transport and separation of different species of materials, for example, transition metal species such as lanthanides and actinides. A variety of devices can be made utilizing the composites including a separator, an electrode for channeling flux of magnetic species, an electrode for effecting electrolysis of magnetic species, a system for channeling electrolyte species, a system for separating particles with different magnetic susceptibilities, improved fuel cells, batteries, and oxygen concentrators. Some composites can be used to make a separator for distinguishing between two species of materials and a flux switch to regulate the flow of a chemical species. Some composites can control chemical species transport and distribution. Other composites enable ambient pressure fuel cells having enhanced performance and reduced weight to be produced.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: December 14, 1999
    Assignee: The University of Iowa Research Foundation
    Inventors: Johna Leddy, Sudath Amarasinghe, Lois Anne Zook
  • Patent number: 5981095
    Abstract: Magnetic composites exhibit distinct flux properties due to gradient interfaces. The composites can be used to improve fuel cells and batteries and effect transport and separation of different chemical species. Devices utilizing the composites include an electrode and improved fuel cells and batteries. Some composites, disposed on the surface of electrodes, prevent passivation of those electrodes and enable direct reformation of liquid fuels. Methods involving these composites provide distinct ways for these composites to be utilized.
    Type: Grant
    Filed: January 28, 1999
    Date of Patent: November 9, 1999
    Assignee: University of Iowa Research Foundation
    Inventors: Johna Leddy, Lois Anne Zook, Sudath Amarasinghe
  • Patent number: 5928804
    Abstract: Magnetic composites exhibit distinct flux properties due to gradient interfaces. Such composites can be used, for example, to improve fuel cells and batteries and to effect transport and separation of different chemical species, such as transition metal species (lanthanides and actinides). A variety of devices can be made utilizing the composites, including a separator, an electrode for channeling flux of magnetic species, an electrode for effecting electrolysis of magnetic species, a system for channeling electrolyte species, a system for separating particles with different magnetic susceptibilities, as well as improved fuel cells, batteries, and oxygen concentrators.
    Type: Grant
    Filed: March 24, 1998
    Date of Patent: July 27, 1999
    Assignee: The University of Iowa Research Foundation
    Inventors: Johna Leddy, Sudath Amarasinghe, Flavio Tinoco
  • Patent number: 5871625
    Abstract: Magnetic composites exhibit distinct flux properties due to gradient interfaces. The composites can be used to improve fuel cells and batteries and effect transport and separation of different chemical species. Devices utilizing the composites include an electrode and improved fuel cells, batteries. Some composites, disposed on the surface of electrodes, prevent passivation of those electrodes and enable direct reformation of liquid fuels. Methods involving these composites provide distinct ways for these composites to be utilized.
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: February 16, 1999
    Assignee: University of Iowa Research Foundation
    Inventors: Johna Leddy, Lois Anne Zook, Sudath Amarasinghe
  • Patent number: 5817221
    Abstract: Magnetic composites exhibit distinct flux properties due to gradient interfaces. The composites can be used to improve fuel cells and batteries and effect transport and separation of different species of materials, for example, transition metal species such as lanthanides and actinides. A variety of devices can be made utilizing the composites including a separator, an electrode for channeling flux of magnetic species, an electrode for effecting electrolysis of magnetic species, a system for channeling electrolyte species, a system for separating particles with different magnetic susceptibilities, improved fuel cells, batteries, and oxygen concentrators. Some composites can be used to make a separator for distinguishing between two species of materials and a flux switch to regulate the flow of a chemical species. Some composites can control chemical species transport and distribution. Other composites enable ambient pressure fuel cells having enhanced performance and reduced weight to be produced.
    Type: Grant
    Filed: February 5, 1996
    Date of Patent: October 6, 1998
    Assignee: University of Iowa Research Foundation
    Inventors: Johna Leddy, Sudath Amarasinghe, Flavio Tinoco