Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6156837 | Carbon blacks | John M. Branan, Jr., Bin Chung, Frank J. Hrach, Jr., Ronald C. Hurst, David J. Kaul +3 more | 2000-12-05 |
| 5352289 | Low ash carbon blacks | Frank J. Hrach, Jr., Chung-Huei Shieh, William L. Sifleet, Jay J. Zimmer | 1994-10-04 |