Jeffers; John M.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Jeffers; John M..The latest application filed is for "geographic black-out method for direct broadcast satellite system".
- Jeffers; John M. - Downsview CA
| Patent | Date |
|---|---|
| Geographic black-out method for direct broadcast satellite system Grant 5,036,537 - Jeffers , et al. July 30, 1 | 1991-07-30 |
| Cryptographic system using interchangeable key blocks and selectable key fragments Grant 4,803,725 - Horne , et al. * February 7, 1 | 1989-02-07 |
| Direct broadcast satellite signal transmission system Grant 4,739,510 - Jeffers , et al. April 19, 1 | 1988-04-19 |
| Cryptographic system using interchangeable key blocks and selectable key fragments Grant 4,694,491 - Horne , et al. September 15, 1 | 1987-09-15 |
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