Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6255525 | Process for preparing purified carboxylic acids | David L. Sikkenga, M. Michelle Morie-Bebel | 2001-07-03 |
| 5770764 | Process for preparing purified aromatic polycarboxylic acids | Martin A. Zeitlin, David L. Sikkenga, Paul K. Behrens | 1998-06-23 |
| 5728870 | Process for preparing purified 2,6-naphthalenedicarboxylic acid | Juergen K. Holzhauer, Rusins Albertins, David L. Sikkenga | 1998-03-17 |
| 5629446 | Process for preparing purified 2,6-naphthalenedicarboxylic acid | Juergen K. Holzhauer, Rusins Albertins, David L. Sikkenga | 1997-05-13 |
| 5563294 | Process for preparing purified 2,6-naphthalenedicarboxylic acid | Juergen K. Holzhauer, Rusins Albertins, David L. Sikkenga | 1996-10-08 |
| 5292934 | Method for preparing aromatic carboxylic acids | David L. Sikkenga, George E. Kuhlmann, Paul K. Behrens, Martin A. Zeitlin | 1994-03-08 |
| 5256817 | Method for purifying a naphthalenedicarboxylic acid | David L. Sikkenga | 1993-10-26 |
| 5041633 | Process for the production of an aromatic polycarboxylic acid | Walter Partenheimer, Gregory P. Hussmann, Juergen K. Holzhauer | 1991-08-20 |
| 4434244 | Maleic anhydride catalyst recycle | George E. Kuhlmann | 1984-02-28 |