Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4956126 | Metal-oxide-silica adsorbent and process for refining oil using the same | Leendert H. Staal, Jan W. Groeneweg | 1990-09-11 |
| 4812436 | Metal-oxide-silica adsorbent for bleaching and refining oil | Leendert H. Staal, Jan W. Groeneweg | 1989-03-14 |
| 4328112 | Process for the preparation of sulfur-containing additives for lubricant compositions | Willem J. de Klein | 1982-05-04 |
| 4283314 | Resin composition having improved internal and external lubricating properties employing branched chain high molecular weight ester derivatives of monocarboxylic acids | Jacobus J. Zeilstra, Willem J. de Klein, Joannes D. Bik | 1981-08-11 |