07956738 is referenced by 2 patents and cites 293 patents.

A field device for use in an industrial process control or monitoring system includes terminals configured to connect to a two-wire process control loop. The loop carries data and provides power to the field device. RF circuitry in the field device is provided for radio frequency communication. A power supply powers the RF circuitry using power received from the two-wire process control loop.

Title
Process field device with radio frequency communication
Application Number
11/842356
Publication Number
7956738 (B2)
Application Date
August 21, 2007
Publication Date
June 7, 2011
Inventor
Kelly M Orth
Apple Valley
MN, US
Brian L Westfield
Victoria
MN, US
David A Broden
Andover
MN, US
Charles R Willcox
Eden Prairie
MN, US
Robert J Karschnia
Chaska
MN, US
Agent
Westman Champlin & Kelly P A
Assignee
Rosemount
MN, US
IPC
G08B 1/08
G08B 29/00
H04Q 11/04
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