Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862501 | Communications network using IC cards | Takashi Kamitake, Shin-ichi Kawamura | 1989-08-29 |
| 4823388 | Communications network using an enciphering and deciphering device | Takashi Kamitake | 1989-04-18 |