Patents by Inventor Dennis J. Dennen

Dennis J. Dennen 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).

  • Inductively coupled ballast circuit
    Patent number: 7385357
    Abstract: A ballast circuit is disclosed for inductively providing power to a load. The ballast circuit includes an oscillator, a driver, a switching circuit, a resonant tank circuit and a current sensing circuit. The current sensing circuit provides a current feedback signal to the oscillator that is representative of the current in the resonant tank circuit. The current feedback signal drives the frequency of the ballast circuit causing the ballast circuit to seek resonance. The ballast circuit preferably includes a current limit circuit that is inductively coupled to the resonant tank circuit. The current limit circuit disables the ballast circuit when the current in the ballast circuit exceeds a predetermined threshold or falls outside a predetermined range.
    Type: Grant
    Filed: November 28, 2006
    Date of Patent: June 10, 2008
    Assignee: Access Business Group International LLC
    Inventors: Roy W. Kuennen, David W. Baarman, Scott A. Mollema, Ronald C. Markham, Dennis J. Dennen