Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5160979 | Test piece coloration comparative decision unit | Hiroyuki Ota, Takao Terada, George H. Sierra, Robert B. Summers, Thomas M. Watlington | 1992-11-03 |
| 5160980 | Test piece coloration comparative decision unit | George H. Sierra, Robert B. Summers, Thomas M. Watlington | 1992-11-03 |
| 5011290 | Test sample color comparison device | Takao Terada, Hiroyuki Ota, Shigeru Makita, George H. Sierra, Robert B. Summers +1 more | 1991-04-30 |
| 4871258 | Color test meter | George H. Sierra, Robert B. Summers, Thomas M. Watlington | 1989-10-03 |