Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7694701 | Structure of check valve for air-packing device | — | 2010-04-13 |
| 7481252 | Structure of check valve for air-packing device | — | 2009-01-27 |
| 7204278 | Structure of check-valve and production method thereof and inflatable air-packing device using same | Yasuzumi Tanaka, Katsutoshi Yoshifusa | 2007-04-17 |
| 7000767 | Structure of air-packing device having improved shock absorbing capability | Yasuzumi Tanaka, Katsutoshi Yoshifusa | 2006-02-21 |