Patents by Inventor David L. Hendren, Jr.

David L. Hendren, Jr. 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).

  • Optical element driving circuit
    Patent number: 7471049
    Abstract: Optical element driving circuits flexibly configure energy sources to cause a flash tube to produce illumination at one of multiple output intensities. The driving circuits allow a single strobe alarm to take the place of multiple strobe alarms individually dedicated to specific output intensities. The driving circuits may also mitigate or eliminate high voltage arcing within the driving circuit.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: December 30, 2008
    Assignee: SimplexGrinnell LP
    Inventors: Kenneth E. Savage, Jr., David L. Hendren, Jr.
  • Optical element driving circuit
    Patent number: 7456585
    Abstract: Optical element driving circuits flexibly configure energy sources to cause a flash tube to produce illumination at one of multiple output intensities. The driving circuits allow a single strobe alarm to take the place of multiple strobe alarms individually dedicated to specific output intensities. The driving circuits may also mitigate or eliminate high voltage arcing within the driving circuit.
    Type: Grant
    Filed: May 11, 2006
    Date of Patent: November 25, 2008
    Assignee: SimplexGrinnell LP
    Inventors: Kenneth E. Savage, Jr., David L. Hendren, Jr.