Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887296 | Cryptographic system for direct broadcast satellite system | — | 1989-12-12 |
| 4803725 | Cryptographic system using interchangeable key blocks and selectable key fragments | John Jeffers | 1989-02-07 |