Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5326457 | Process for making carbon electrode impregnating pitch from coal tar | — | 1994-07-05 |
| 5314609 | Process for preparing debenzolized tar and low-benzene centrifuged tar sludge | David Q. Wible | 1994-05-24 |