Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5035812 | Thermostable polymers | Josef Weichmann, Johann Plank, Manfred Bichler | 1991-07-30 |
| 4818288 | Dispersant for concrete mixtures of high salt content | Johann Plank | 1989-04-04 |
| 4666979 | Metal compounds of acid group-containing condensation products and co-condensation products of ketones and aldehydes | Johann Plank | 1987-05-19 |
| 4657593 | Modifying surface tension of finely-divided materials in a liquid | Johann Plank | 1987-04-14 |
| 4585853 | Acid group-containing hydrophilic co-condensation products of ketone-aldehyde resins | Johann Plank | 1986-04-29 |
| 4296089 | Inorganic fibers | Walter Lukas, Ekkehard Weinberg | 1981-10-20 |
| 4284433 | Additives for water-hardening binding agents | Jean-Pierre Deppen, Hans-Gunter Rosenbauer | 1981-08-18 |
| 4270954 | Inorganic fibers | Walter Lukas, Ekkehard Weinberg | 1981-06-02 |