Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4551513 | Water soluble copolymers | Friedrich Engelhardt, Klaus Kuhlein, Ulrich Riegel, Sigmar-Peter von Halasz, Jeffery C. Dawson | 1985-11-05 |
| 4500437 | Water soluble copolymers for use in fracture-acidizing of wells | Friedrich Engelhardt, Klaus Kuhlein, Ulrich Riegel, Sigmar-Peter von Halasz, Jeffery C. Dawson | 1985-02-19 |