Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5075416 | Novel process | Bodo Friedrich, Hans Spengler, Robert Zellerhoff | 1991-12-24 |
| 4900717 | Recovery of 2,6-dialkyl-naphthalene isomers | Wilhelm Holtmann, Robert Zellerhoff, Rudolf Oberkobusch, Bernhard Charpey | 1990-02-13 |
| 4598138 | Stable, phenolic modified hydrocarbon resins for leucopigments | Wolfgang Lucke, Herbert Beneke | 1986-07-01 |