| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 7 | |
| #2 | EPO (European Patent Office) | 3 | |
| #3 | Canada | 2 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy |
| # | Technology | |
|---|---|---|
| #1 | Dynamo-electric machines | |
| #2 | Electric motor controls | |
| #3 | Magnets and transformers |
| # | Name | Total Patents |
|---|---|---|
| #1 | Welburn Ross D | 12 |
| Publication | Filing date | Title |
|---|---|---|
| US4568865A | Self-corrected synchro/resolver | |
| US4551708A | Reactance-commutated high resolution servo motor system | |
| US4458168A | Toothed reluctance synchro/resolver | |
| US4532448A | Flux director, tooth shield | |
| US4481453A | Torque loop control system and method | |
| US4501980A | High torque robot motor |