Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4837840 | System for verifying authenticity of various articles | — | 1989-06-06 |
| 4816824 | Merchandise verification and information system | Ronald A. Katz | 1989-03-28 |
| 4811408 | Image dissecting document verification system | — | 1989-03-07 |
| 4795890 | Device authentication system for on and off line use | — | 1989-01-03 |