Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5037508 | Aluminum chlorohydrate or hydrotalcite treated kaolin clays for pitch control | Walter J. Hyder, Albert C. Kunkle | 1991-08-06 |
| 4927465 | Kaolin clays for pitch control | Walter J. Hyder, Albert C. Kunkle | 1990-05-22 |