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| Number | Title | Issue Date |
| 5305385 | Network message security method and apparatus A security system for local area networks (LAN) to prevent eavesdropping of or to control access to LAN traffic at repeater or concentrator ports. The security system determines which repeater ports are to have security activated according to a given set ... | 04/19/1994 |
| 5109206 | Balanced low-pass common mode filter A balanced L-section low-pass common mode filter is connected in series with balanced data I/O lines to remove common mode signals from balanced line difference mode signals. The filter includes input and output series transformers configured so that the ... | 04/28/1992 |
