Issued Patents All Time
Showing 51–65 of 65 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5274048 | Use of glycidyl phosphonates as crosslinkers in the preparation of hydrogels | Fritz Engelhardt, Hanss-Jerg Kleiner, Wolf-Dieter Muller | 1993-12-28 |
| 5258448 | Absorbent polymers, manufacturing process and their use in particular for sanitary articles | Paul Mallo, Fritz Engelhardt, Rüdiger Funk | 1993-11-02 |
| 5068298 | Alkenyl-phosphonic and -phosphinic esters, process for their preparation, their use and hydrogels prepared using them | Friedrich Engelhardt, Joachim Gersdorf, Hans-Jerg Kleiner | 1991-11-26 |
| 5066745 | Alkenylphosphonic and --phosphinic acid esters, process for their preparation, hydrogels produced using them, and their use | Friedrich Engelhardt, Joachim Gersdorf, Hans-Jerg Kleiner | 1991-11-19 |
| 5041496 | Hydrophilic, swellable graft copolymers, their preparation and use | Friedrich Engelhardt, Jurgen Kuhlwein | 1991-08-20 |
| 5011892 | Hydrophilic swellable graft copolymers, their preparation and use | Friedrich Engelhardt | 1991-04-30 |
| 4959441 | Alkenylphosphonic and -phosphinic acid esters, process for their preparation, hydrogels produced using them, and their use | Friedrich Engelhardt, Joachim Gersdorf, Hans-Jerg Kleiner | 1990-09-25 |
| 4828570 | Tanning agent and a process for its preparation | Fritz Engelhardt, Kuno Reh, Helmut Croon, Hermann Becker, Werner Lotz | 1989-05-09 |
| 4749758 | Process for the preparation of copolymers of vinylphosphonic acid and (meth) acrylic acid in aqueous solution | Walter Dursch, Jurgen Grosse, Werner Gohla, Friedrich Engelhardt | 1988-06-07 |
| 4587283 | Cement slurries for deep holes, with a copolymer content for reducing the water loss | Martin Hille, Wolfgang Friede, Heinz Wittkus, Friedrich Engelhardt | 1986-05-06 |
| 4551513 | Water soluble copolymers | Friedrich Engelhardt, Klaus Kuhlein, Sigmar-Peter von Halasz, Jeffery C. Dawson, Anthony R. Reed | 1985-11-05 |
| 4500437 | Water soluble copolymers for use in fracture-acidizing of wells | Friedrich Engelhardt, Klaus Kuhlein, Sigmar-Peter von Halasz, Jeffery C. Dawson, Anthony R. Reed | 1985-02-19 |
| 4378446 | Acrylate-modified melamine resin which is stable on storage, its preparation and its use | Wilhelm Adam, Curt A. Wagner, Renate Konrad, Friedrich Engelhardt, Georg W. Eckhardt +1 more | 1983-03-29 |
| 4357245 | Water-soluble copolymer and its preparation | Friedrich Engelhardt, Martin Hille, Heinz Wittkus | 1982-11-02 |
| 4309523 | Water-soluble copolymer of acrylamidomethylpropanesulfonic acids salts | Friedrich Engelhardt, Martin Hille, Heinz Wittkus | 1982-01-05 |