Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6904623 | Drain plug structure for bath tub | Masaki Ishigaki, Shinichi Ohta | 2005-06-14 |
| 6347417 | Drain plug device | — | 2002-02-19 |
| 4860390 | Drainage plug | — | 1989-08-29 |
| 4638618 | Decorative panels comprising replaceable decorative sheets | Takashi Iesaka, Takaaki Wada, Masayuki Izumi | 1987-01-27 |
| 4596057 | Draining plug device | Shinobu Ito | 1986-06-24 |