Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4587513 | Noncontact shaft angle detector | David E. Burrowes, Alan W. Holmes | 1986-05-06 |
| 4544184 | Tamper-proof identification card and identification system | Robert F. Freund | 1985-10-01 |
| 4253095 | Alarm apparatus for detecting disturbance or other change of condition | Ray P. Schwarz | 1981-02-24 |