Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4770534 | Color indication comparison method | Hiroshi Matsuki, Takao Sumiyoshi | 1988-09-13 |
| 4715716 | Rhombic-shaped scale device for use in judging discoloration, fading or staining | Nagaichi Suga | 1987-12-29 |
| 4704903 | Light fastness/weather resistance accelerated test machine with an air mixing regulator | Shigeru Suga, Etsuji Natori, Shigeo Suga, Katsuaki Mitamura | 1987-11-10 |