Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4551513 | Water soluble copolymers | Friedrich Engelhardt, Klaus Kuhlein, Ulrich Riegel, Sigmar-Peter von Halasz, Anthony R. Reed | 1985-11-05 |
| 4507440 | Cross-linkable and cross linked macromolecular compositions wherein cross-linking is by structural bridges of the formula --NR.sup.x --CH.dbd.N--CO-- and their preparation | Friedrich Engelhardt, Steffen Piesch, Juliane Balzer | 1985-03-26 |
| 4500437 | Water soluble copolymers for use in fracture-acidizing of wells | Friedrich Engelhardt, Klaus Kuhlein, Ulrich Riegel, Sigmar-Peter von Halasz, Anthony R. Reed | 1985-02-19 |
| 4499232 | Water soluble, crosslinkable polymer compositions, their preparation and use | Friedrich Engelhardt, Steffen Piesch, Juliane Balzar | 1985-02-12 |