Patents by Inventor Dean H. Johnston

Dean H. Johnston 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: 7902744
    Abstract: A structure for high performance light emitting electrochemical cells comprises at least two active layers of mixed ionic/electronic conducting materials, at least one of which is electroluminescent. The active layers are sandwiched between ion blocking electrodes, typically metal and/or transparent conducting oxide, that are electrically but not ionically conductive. Application of bias to the electrodes results in the polarization of ions at the electrodes thereby generating a field to drive the injection of electronic carriers into the active layer. The injected electron and holes recombine within the active layers to emit light. The ability to balance electron and hole injection in the design of such devices provides for optimal light emission efficiency.
    Type: Grant
    Filed: December 13, 2007
    Date of Patent: March 8, 2011
    Assignee: The State of Oregon Acting by and through the State Board of Higher Education on Behalf of the University of Oregon
    Inventors: Mark C. Lonergan, Calvin H. W. Cheng, Dean H. Johnston
  • Publication number: 20080157662
    Abstract: A structure for high performance light emitting electrochemical cells comprises at least two active layers of mixed ionic/electronic conducting materials, at least one of which is electroluminescent. The active layers are sandwiched between ion blocking electrodes, typically metal and/or transparent conducting oxide, that are electrically but not ionically conductive. Application of bias to the electrodes results in the polarization of ions at the electrodes thereby generating a field to drive the injection of electronic carriers into the active layer. The injected electron and holes recombine within the active layers to emit light. The ability to balance electron and hole injection in the design of such devices provides for optimal light emission efficiency.
    Type: Application
    Filed: December 13, 2007
    Publication date: July 3, 2008
    Inventors: Mark C. Lonergan, Calvin H. W. Cheng, Dean H. Johnston
  • Patent number: 7049068
    Abstract: A method of detecting a nucleic acid (e.g., DNA, RNA) that contains at least one preselected base (e.g., adenine, guanine, 6-mercaptoguanine, 8-oxo-guanine, and 8-oxo-adenine) comprises (a) reacting the nucleic acid with a transition metal complex capable of oxidizing the preselected base in an oxidation-reduction reaction; (b) detecting the oxidation-reduction reaction; and (c) determining the presence or absence of the nucleic acid from the detected oxidation-reduction reaction at the preselected base. The method may be used in a variety of applications, including DNA sequencing, diagnostic assays, and quantitative analysis.
    Type: Grant
    Filed: November 6, 2001
    Date of Patent: May 23, 2006
    Assignee: The University of North Carolina at Chapel Hill
    Inventors: H. Holden Thorp, Dean H. Johnston, Mary E. Napier, Carson R. Loomis, Mark F. Sistare, Jinheung Kim
  • Publication number: 20020106683
    Abstract: A method of detecting a nucleic acid (e.g., DNA, RNA) that contains at least one preselected base (e.g., adenine, guanine, 6-mercaptoguanine, 8-oxo-guanine, and 8-oxo-adenine) comprises (a) reacting the nucleic acid with a transition metal complex capable of oxidizing the preselected base in an oxidation-reduction reaction; (b) detecting the oxidation-reduction reaction; and (c) determining the presence or absence of the nucleic acid from the detected oxidation-reduction reaction at the preselected base. The method may be used in a variety of applications, including DNA sequencing, diagnostic assays, and quantitative analysis.
    Type: Application
    Filed: November 6, 2001
    Publication date: August 8, 2002
    Inventors: H. Holden Thorp, Dean H. Johnston, Mary E. Napier, Carson R. Loomis, Mark F. Sistare, Jinheung Kim
  • Patent number: 6361951
    Abstract: A method of detecting a nucleic acid (e.g., DNA, RNA) that contains at least one preselected base (e.g., adenine, guanine, 6-mercaptoguanine, 8-oxo-guanine, and 8-oxo-adenine) comprises (a) reacting the nucleic acid with a transition metal complex capable of oxidizing the preselected base in an oxidation-reduction reaction; (b) detecting the oxidation-reduction reaction; and (c) determining the presence or absence of the nucleic acid from the detected oxidation-reduction reaction at the preselected base. The method may be used in a variety of applications, including DNA sequencing, diagnostic assays, and quantitative analysis.
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: March 26, 2002
    Assignee: The University of North Carolina at Chapel Hill
    Inventors: H. Holden Thorp, Dean H. Johnston, Mary E. Napier, Carson R. Loomis, Mark F. Sistare, Jinheung Kim
  • Patent number: 6132971
    Abstract: A method of detecting a nucleic acid (e.g., DNA, RNA) that contains at least one preselected base (e.g., adenine, guanine, 6-mercaptoguanine, 8-oxo-guanine, and 8-oxo-adenine) comprises (a) reacting the nucleic acid with a transition metal complex capable of oxidizing the preselected base in an oxidation-reduction reaction; (b) detecting the oxidation-reduction reaction; and (c) determining the presence or absence of the nucleic acid from the detected oxidation-reduction reaction at the preselected base. The method may be used in a variety of applications, including DNA sequencing, diagnostic assays, and quantitative analysis.
    Type: Grant
    Filed: October 27, 1998
    Date of Patent: October 17, 2000
    Assignee: The University of North Carolina at Chapel Hill
    Inventors: H. Holden Thorp, Dean H. Johnston, Mary E. Napier, Carson R. Loomis, Mark F. Sistare, Jinheung Kim
  • Patent number: 5871918
    Abstract: A method of detecting a nucleic acid (e.g., DNA, RNA) that contains at least one preselected base (e.g., adenine, guanine, 6-mercaptoguanine, 8-oxo-guanine, and 8-oxo-adenine) comprises (a) reacting the nucleic acid with a transition metal complex capable of oxidizing the preselected base in an oxidation-reduction reaction; (b) detecting the oxidation-reduction reaction; and (c) determining the presence or absence of the nucleic acid from the detected oxidation-reduction reaction at the preselected base. The method may be used in a variety of applications, including DNA sequencing, diagnostic assays, and quantitative analysis.
    Type: Grant
    Filed: June 20, 1996
    Date of Patent: February 16, 1999
    Assignee: The University of North Carolina at Chapel Hill
    Inventors: H. Holden Thorp, Dean H. Johnston, Mary E. Napier, Carson R. Loomis, Mark F. Sistare, Jinheung Kim