Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4353050 | Displacement measuring transducer | Alan Pelczyk, Robert F. Purssell, Alfred J. Woollard, David M. Walker, Alan G. Henderson +1 more | 1982-10-05 |
| 4316105 | Comparator | — | 1982-02-16 |
| 4284990 | Position sensing transducer | Alan G. Henderson, Alastair K. Stevenson, David M. Walker | 1981-08-18 |
| 4191145 | Vacuum sensor | — | 1980-03-04 |