Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D432219 | Toilet seat with cover | Ayse Birsel, Junichi Tani, Koichi Watanabe | 2000-10-17 |
| D413658 | Combined toilet seat and cover | Ayse Birsel, Junichi Tani, Koichi Watanabe | 1999-09-07 |
| 5666672 | Toilet attachment with easily detachable seat | Ayse Birsel, Junichi Tani, Kenichi Nagato, Koichi Watanabe, Kuniaki Shinohara | 1997-09-16 |
| 5223314 | Cover film for sublimation thermal-transfer hard copy | Hideo Watanabe, Kaoru Naito | 1993-06-29 |