Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888803 | Method and apparatus for verifying a value for a batch of items | — | 1989-12-19 |
| 4878246 | Method and apparatus for generating encryption/decryption key | Maya R. Barton | 1989-10-31 |
| 4873645 | Secure postage dispensing system | Kevin D. Hunter, Robert T. Durst, Jr. | 1989-10-10 |
| 4853961 | Reliable document authentication system | — | 1989-08-01 |
| 4835713 | Postage meter with coded graphic information in the indicia | — | 1989-05-30 |