Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5054120 | Receiver for personal radio paging service | Katsumi Ushiyama, Seiji Nishikawa | 1991-10-01 |
| 5023621 | Small antenna | Katsumi Ushiyama, Kiyohiko Itoh | 1991-06-11 |
| 5017932 | Miniature antenna | Katsumi Ushiyama, Kiyohiko Itoh | 1991-05-21 |
| 5001778 | Portable radio receiver | Katsumi Ushiyama, Giho Makino, Kiyohiko Itoh | 1991-03-19 |