Issued Patents All Time
Showing 51–57 of 57 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5844998 | Headphone apparatus | — | 1998-12-01 |
| 5497427 | Headphone | — | 1996-03-05 |
| 5420935 | Auricle insertion headphone with improved grill | Ikuo Shinohara, Kenichi Katayama | 1995-05-30 |
| 5406037 | Headphone including means for mounting belt-like suspender | Masahiro Dohi | 1995-04-11 |
| 5018599 | Headphone device | Masahiro Dohi | 1991-05-28 |
| 4874316 | Connector apparatus | Yoshiyuki Kamon, Akira Ogiwara | 1989-10-17 |
| 4736435 | Ear piece transducer | Yoshihiro Yokoyama, Shingo Watanabe | 1988-04-05 |