Patents by Inventor Jeffrey Johnstone

Jeffrey Johnstone 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: 7816891
    Abstract: An active voltage management device and a method for actively managing a voltage level of an energy storage device are provided. The active voltage management device comprises: a pair of input terminals adapted to be connected to the energy storage device; a reverse polarity protection circuit coupled to the pair of input terminals; a voltage comparator circuit adapted to compare a second voltage associated with the voltage level of the energy storage device to a reference voltage and to provide an output based upon the comparison of the second voltage to the reference voltage; and a transistor adapted to operate in a linear mode to dissipate energy from the energy storage device at a substantially constant current level, wherein output of the voltage comparator circuit is adapted to activate the transistor when the second voltage is greater than or equal to the reference voltage.
    Type: Grant
    Filed: November 19, 2007
    Date of Patent: October 19, 2010
    Assignee: Maxwell Technologies, Inc.
    Inventors: Dragan Nebrigic, Jeffrey Johnstone, Vlastislav Haman, Hung Q. Ha
  • Publication number: 20080136376
    Abstract: An active voltage management device and a method for actively managing a voltage level of an energy storage device are provided. The active voltage management device comprises: a pair of input terminals adapted to be connected to the energy storage device; a reverse polarity protection circuit coupled to the pair of input terminals; a voltage comparator circuit adapted to compare a second voltage associated with the voltage level of the energy storage device to a reference voltage and to provide an output based upon the comparison of the second voltage to the reference voltage; and a transistor adapted to operate in a linear mode to dissipate energy from the energy storage device at a substantially constant current level, wherein output of the voltage comparator circuit is adapted to activate the transistor when the second voltage is greater than or equal to the reference voltage.
    Type: Application
    Filed: November 19, 2007
    Publication date: June 12, 2008
    Applicant: Maxwell Technologies, Inc.
    Inventors: Dragan Nebrigic, Jeffrey Johnstone, Vlastislav Haman, Hung Q. Ha
  • Publication number: 20070184711
    Abstract: It is desirable to be able to securely connect individual electrical components within an electrical module. An electrical module is provided in which a plurality of energy storage components are connected together using a clamp instead of wiring or bus bar connections. In one configuration, for example, a first energy storage component comprising a first terminal and second terminal is connected to a second energy storage component comprising a third terminal and a fourth terminal. The first terminal of the first energy storage component is electrically connected to a third terminal of the second energy storage component using a clamp comprising a recess. The recess of the clamp receives at least a portion of the first terminal of the first energy storage component and at least a portion of the third terminal of the second energy storage component.
    Type: Application
    Filed: December 15, 2006
    Publication date: August 9, 2007
    Applicant: MAXWELL TECHNOLOGIES, INC.
    Inventors: Guy Thrap, Ray Soliz, Jeffrey Johnstone, Steven Stanley
  • Patent number: D571294
    Type: Grant
    Filed: March 31, 2007
    Date of Patent: June 17, 2008
    Assignee: Maxwell Technologies, Inc.
    Inventors: Steve Stanley, Jeffrey Johnstone
  • Patent number: D571295
    Type: Grant
    Filed: March 31, 2007
    Date of Patent: June 17, 2008
    Assignee: Maxwell Technologies, Inc.
    Inventors: Steve Stanley, Jeffrey Johnstone