Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4864115 | Electronic access card having key pads and coils and combination using the same | Keith S. Clark | 1989-09-05 |
| 4851652 | Electronic lock box, access card, system and method | — | 1989-07-25 |
| 4800255 | Electronic access card with visual display | — | 1989-01-24 |
| 4796620 | System for sensing abnormal heart activity by means of heart rate acceleration and deceleration detection | — | 1989-01-10 |