Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5186748 | Process for the preparation of bismuth vanadate pigments, and novel bismuth vanadate pigments of high color strength | Leonardus Johannes Hubertus Erkens, Gregor Schmitt, Werner F. C. G. Corvers | 1993-02-16 |
| 5007963 | Novel process for the preparation of lead molybdate pigments and novel lead molybdate pigments | Leonardus Johannes Hubertus Erkens, Gerben P. Algra, Hubertus P. A. Gielkens | 1991-04-16 |
| 4872915 | Orthorhombic lead chromate pigments of greenish hue | Leonardus Johannes Hubertus Erkens, Gerben P. Algra, Jacobus-Michiel-Hubertus Snijders, Andre Pugin | 1989-10-10 |