Patents by Inventor Geoff Wallhead

Geoff Wallhead 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: 8680778
    Abstract: An emergency-lighting device for operating a light-source, in particular an LED, comprises an energy storage unit, a charging circuit, to be supplied with a mains supply voltage (Uin), for charging the energy storage unit during charging operation, the charging circuit comprising a potential separation, and also a driver circuit, supplied by the energy storage unit during emergency-light operation, for operating the light-source. Furthermore a control unit is provided which is designed for monitoring the state of the mains supply voltage (Uin) during charging operation and, when an emergency condition is detected, for activating emergency-light operation, the control unit ascertaining the state of the mains supply voltage (Uin) on the basis of operating variables of the emergency-lighting device which are measured on the output side of the charging circuit.
    Type: Grant
    Filed: January 19, 2007
    Date of Patent: March 25, 2014
    Assignee: Tridonic Atco GmbH & Co. KG
    Inventors: Frederick Stevens, Geoff Wallhead, Daniel Rohner, Alexander Mair
  • Publication number: 20100060189
    Abstract: An emergency-lighting device for operating a light-source, in particular an LED, comprises an energy storage unit, a charging circuit, to be supplied with a mains supply voltage (Uin), for charging the energy storage unit during charging operation, the charging circuit comprising a potential separation, and also a driver circuit, supplied by the energy storage unit during emergency-light operation, for operating the light-source. Furthermore a control unit is provided which is designed for monitoring the state of the mains supply voltage (Uin) during charging operation and, when an emergency condition is detected, for activating emergency-light operation, the control unit ascertaining the state of the mains supply voltage (Uin) on the basis of operating variables of the emergency-lighting device which are measured on the output side of the charging circuit.
    Type: Application
    Filed: January 19, 2007
    Publication date: March 11, 2010
    Applicant: TridoniticAtco GmbH & Co. KG
    Inventors: Frederick Stevens, Geoff Wallhead, Daniel Rohner, Alexander Mair