Issued Patents All Time
Showing 1–5 of 5 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 |
| 4739510 | Direct broadcast satellite signal transmission system | John Jeffers, S. Wayne Mundy, Joseph B. Glaab | 1988-04-19 |
| 4694491 | Cryptographic system using interchangeable key blocks and selectable key fragments | John Jeffers | 1987-09-15 |
| 4685131 | Program blocking method for use in direct broadcast satellite system | — | 1987-08-04 |