Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4661991 | Circuit arrangement for preventing unauthorized access to a communication system which is protected by a subscriber-specific password | — | 1987-04-28 |
HL
Helmut Logemann
Overall (All Time): #3,973,302 of 4,157,543Top 100%
1
Patents All Time