Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4814050 | Estimation and control of alumina concentration in hall cells | William D. McGraw, Kevin G. Christian, William M. Hall, Christopher M. Seaman, Robert L. Kozarek | 1989-03-21 |