Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5160979 | Test piece coloration comparative decision unit | Hiroyuki Ota, Takao Terada, Bernd G. Herpichboehm, George H. Sierra, Thomas M. Watlington | 1992-11-03 |
| 5160980 | Test piece coloration comparative decision unit | Bernd G. Herpichboehm, George H. Sierra, Thomas M. Watlington | 1992-11-03 |
| D321488 | Colorimeter | George H. Sierra | 1991-11-12 |
| D318245 | Colorimeter | George H. Sierra, James D. Morrow | 1991-07-16 |
| 5011290 | Test sample color comparison device | Takao Terada, Hiroyuki Ota, Shigeru Makita, Bernd G. Herpichboehm, George H. Sierra +1 more | 1991-04-30 |
| 4871258 | Color test meter | Bernd G. Herpichboehm, George H. Sierra, Thomas M. Watlington | 1989-10-03 |