Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6031030 | Production process | Robert Langley, Paul Kerwin, Kenneth Grant Dykes | 2000-02-29 |
| 5964929 | Process for the production of ink concentrates | Robert Langley, Paul Kerwin, Kenneth Grant Dykes | 1999-10-12 |
| 5776238 | Production of pigments | Paul Kerwin, Robert Langley | 1998-07-07 |
| 4801634 | Production of pigmentary copper phthalocyanine | Robert Langley, John D. Stewart | 1989-01-31 |
| 4801638 | Production of pigmentary copper phthalocyanine | Robert Langley, John D. Stewart | 1989-01-31 |
| 4694078 | Production of pigmentary copper phthalocyanine | Robert Langley, John D. Stewart | 1987-09-15 |