Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4852156 | Private telephone system using a personal code number to access the telephone nearest to the code number holder | — | 1989-07-25 |
| 4810862 | System for judging propriety of use of an integrated circuit card with a card terminal | Harumi Nakano | 1989-03-07 |
| 4809326 | IC card system | — | 1989-02-28 |
| 4803351 | IC card system with control of data-writing process | — | 1989-02-07 |