Issued Patents All Time
Showing 51–64 of 64 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6170044 | Systems and methods for synchronizing redundant controllers with minimal control disruption | Norman R. Swanson | 2001-01-02 |
| 6138049 | System and methods for generating and distributing alarm and event notifications | — | 2000-10-24 |
| 5988847 | Systems and methods for implementing a dynamic cache in a supervisory control system | Ian K. Canavan, Peter C. Davis | 1999-11-23 |
| 5426774 | Method for maintaining a sequence of events function during failover in a redundant multiple layer system | Indra Banerjee, Kevin R. McCracken | 1995-06-20 |
| 5261092 | Synchronizing slave processors through eavesdrop by one on periodic sync-verify messages directed to another followed by comparison of individual status | Robert W. Bristow | 1993-11-09 |
| 5255388 | Synchronizing slave processors through eavesdrop by one on a write request message directed to another followed by comparison of individual status request replies | Pankaj H. Mody, Robert W. Bristow | 1993-10-19 |
| 5210756 | Fault detection in relay drive circuits | Karl T. Kummer, Robert W. Bristow, Hieu T. Duong | 1993-05-11 |
| 5202822 | Universal scheme of input/output redundancy in a process control system | Robert W. Bristow | 1993-04-13 |
| 5168443 | Method for providing redundancy of a high speed pulse input I/O processor | Indra Banerjee | 1992-12-01 |
| 5142470 | Method of maintaining synchronization of a free-running secondary processor | Robert W. Bristow | 1992-08-25 |
| 5136498 | Method for enacting failover of a 1:1 redundant pair of slave processors | Robert W. Bristow, Karl T. Kummer | 1992-08-04 |
| 5088021 | Apparatus and method for guaranteed data store in redundant controllers of a process control system | Pankaj H. Mody | 1992-02-11 |
| 5016244 | Method for controlling failover between redundant network interface modules | W. Russell Massey, Renee Drobish | 1991-05-14 |
| 4958270 | Method for control data base updating of a redundant processor in a process control system | Pankaj H. Mody | 1990-09-18 |