| 8184562 |
Process control system having dual wireless communication links |
Thomas A. Boyd |
2012-05-22 |
| 7623479 |
Process control system devices with dual hardwired and wireless communication ports |
Thomas A. Boyd |
2009-11-24 |
| 7609660 |
Wireless transceiver pair disposed within a process control system |
Thomas A. Boyd |
2009-10-27 |
| 7602741 |
Field device in a process control system using wireless radio communications to transmit and receive sense and control signals |
Thomas A. Boyd |
2009-10-13 |
| 7519012 |
Distributed control system for controlling material flow having wireless transceiver connected to industrial process control field device to provide redundant wireless access |
Thomas A. Boyd |
2009-04-14 |
| 7453834 |
Distributed control system for controlling material flow having wireless transceiver connected to industrial process control field device to provide redundant wireless access |
Thomas A. Boyd |
2008-11-18 |
| 6236334 |
Distributed control system for controlling material flow having wireless transceiver connected to industrial process control field device to provide redundant wireless access |
Thomas A. Boyd |
2001-05-22 |
| 5793963 |
Apparatus for providing non-redundant secondary access to field devices in a distributed control system |
Thomas A. Boyd |
1998-08-11 |
| 5682476 |
Distributed control system having central control providing operating power to wireless transceiver connected to industrial process control field device which providing redundant wireless access |
Thomas A. Boyd |
1997-10-28 |