Circuit Closing Type Patents (Class 340/815.89)
  • Loop powered current-loop wireless transmitter
    Patent number: 7684768
    Abstract: A self-powered current loop transmitter transmits a process variable over a wireless link, deriving operating power from the current which drives the loop. A storage capacitor is connected across the system input terminals through a switch to provide the operating power for the system components.
    Type: Grant
    Filed: June 19, 2007
    Date of Patent: March 23, 2010
    Inventors: Otto P. Fest, Noel Smith