Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6526840 | Method for measuring sound absorption power of a theater chair with a human being seated thereon and a dummy sound absorber | Takeshi Sakai | 2003-03-04 |
| 6463817 | Dummy sound absorber representing a seated human for measuring sound absorption power of a theater chair | Takeshi Sakai | 2002-10-15 |
| 6105443 | Dummy sound absorber representing a seated human for measuring sound absorption power of a theater chair | Takeshi Sakai | 2000-08-22 |
| 5465469 | Method for measuring sound absorption power of a theater chair with a dummy representing a human being seated thereon | Takeshi Sakai | 1995-11-14 |