Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874245 | Optical shaft angular and torsional displacement and speed sensing system | William B. Spillman, Jr., Sylvester M. Ellinger, Douglas R. Patriquin, Bruce R. Kline | 1989-10-17 |
| 4863274 | Optical shaft torsional displacement and speed sensing system | William B. Spillman, Jr., Michael Ellinger, Douglas R. Patriquin, Bruce R. Kline | 1989-09-05 |