Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7399355 | Fluid loss control additive and cement compositions comprising same | Michael J. Szymanski, Samuel J. Lewis, Christian Spindler | 2008-07-15 |
| 7202319 | Water-soluble copolymers based on olefinic sulfonic acids, method for the production thereof and use of the same | Christian Spindler, Johann Plank, Uwe Huber | 2007-04-10 |
| 6608159 | Polymeric, acrylamide-free water retention agent | Johann Plank | 2003-08-19 |
| 6346588 | Terpolymers based on sulfobetaines, processes for their preparation and their use as thickeners for aqueous salt solutions | Johann Plank, Michael Schinabeck | 2002-02-12 |