Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5381227 | Standard materials and methods for instrumental measurement for ASTM color of petroleum products using said standard materials | Masahiro Yamaguchi | 1995-01-10 |
| 5139329 | Standard samples and methods of instrumental measurement of Saybolt color of petroleum products using said samples | Masahiro Yamaguchi | 1992-08-18 |
| 5139330 | Standard samples and methods of instrumental measurement of ASTM color of petroleum products using said samples | Masahiro Yamaguchi | 1992-08-18 |