Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885401 | Bis-phosphite compounds | Ernst Billig, Anthony G. Abatjoglou | 1989-12-05 |
| 4861918 | Reactivation of hydroformylation catalysts | David J. Miller, Ernst Billig, Bernard L. Shaw | 1989-08-29 |
| 4835299 | Process for purifying tertiary organophosphites | John Michael Maher, Ernst Billig | 1989-05-30 |