Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4857999 | Video monitoring system | — | 1989-08-15 |
| 4829558 | System and device for data transmission, and related method | — | 1989-05-09 |
| 4816904 | Television and market research data collection system and method | William J. McKenna, Kenneth W. Silvers, Rand B. Nickerson, Harold R. Walker, Joseph A. Cullity +1 more | 1989-03-28 |