Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4201404 | Pressure-sensitive marking materials | Jack W. Charbonneau, Richard S. Law, Willis J. Ludwig | 1980-05-06 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4201404 | Pressure-sensitive marking materials | Jack W. Charbonneau, Richard S. Law, Willis J. Ludwig | 1980-05-06 |