Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5182616 | Color communication kits | Kenneth G. Roberts | 1993-01-26 |
| 5143212 | Gemstone color communication kits | Kenneth G. Roberts | 1992-09-01 |
| D328612 | Simulated gemstone color guide | Kenneth G. Roberts | 1992-08-11 |