Issued Patents All Time
Showing 1–21 of 21 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6291734 | Integrated low pressure depropanizer/debutanizer column | — | 2001-09-18 |
| 6077985 | Integrated deethanizer/ethylene fractionation column | — | 2000-06-20 |
| 5372609 | Self-tanning, pretanning and assist tanning of pelts and skin pelts and retanning of leather and skin | Juergen Weiser, Wolfgang Reuther, Hermann Birkhofer, Ortwin Schaffer | 1994-12-13 |
| 5342916 | Condensation polymers of sulfonated phenols, urea, other organic nitrogen-bases, and formaldehyde, and their use as tanning agents and as spraying aids for redispersible polymer powders | Juergen Weiser, Wolfgang Reuther, Ortwin Schaffer, Gernot Franzmann, Thomas Schwerzel +3 more | 1994-08-30 |
| 5338517 | Catalytic distillation column reactor and tray | William T. Evans | 1994-08-16 |
| 5286263 | Use of copolymers based on long-chain alkyl vinyl ethers and ethylenically unsaturated dicarboxylic anhydrides for rendering leathers and skins water-repellent | Ortwin Schaffer, Herbert Bay, Norbert Greif, Knut Oppenlaender, Walter Denzinger +1 more | 1994-02-15 |
| 5279613 | Copolymers based on long-chain olefins and ethylenically unsaturated dicarboxylic anhydrides for rendering leathers and skins water-repellent | Ortwin Schaffer, Herbert Bay, Norbert Greif, Knut Oppenlaender, Walter Denzinger +1 more | 1994-01-18 |
| 5155164 | Products of the condensation of phenolmonosulfonic acids, dihydroxydiphenyl sulfones, urea and formaldehyde | Hermann Graf, Adolf Stuebinger, Klaus Lorenz, Ortwin Schaffer | 1992-10-13 |
| 5147644 | Use of mixtures of polyglycerol fatty esters as emulsifiers in cosmetic and pharmaceutical formulations | Knut Oppenlaender, Brigette Wegner, Franz Frosch, Hans-Ulrich Wekel | 1992-09-15 |
| 5124181 | Copolymers based on long-chain unsaturated esters and ethylenically unsaturated carboxylic acids for making leather and furs water repellent | Ortwin Schaffer, Herbert Bay, Norbert Greif, Knut Oppenlaender, Walter Denzinger +1 more | 1992-06-23 |
| 4978780 | Preparation of ether sulfonates and polyglycol ether sulfonates, and products prepared by this method | Rolf Fikentscher, Norbert Greif, Knut Oppenlaender | 1990-12-18 |
| 4675025 | Aqueous coal dispersions | Knut Oppenlaender, Friedrich Hovemann, Erich Schwartz | 1987-06-23 |
| 4657560 | Aqueous coal dispersions | Knut Oppenlaender, Friedrich Hovemann, Erich Schwartz | 1987-04-14 |
| 4517114 | Inhibitors against corrosion caused by CO.sub.2 and H.sub.2 S in water-in-oil emulsions | Knut Oppenlaender, Klaus Barthold | 1985-05-14 |
| 4436639 | Ammonium salts of polymaleic acids and use as corrosion inhibitors in water-in-oil emulsions | Knut Oppenlaender, Klaus Barthold | 1984-03-13 |
| 4435298 | Ammonium salts of polymaleic acids, and their use as corrosion inhibitors in mineral oils | Knut Oppenlaender, Hans-Henning Vogel, Erich Schwartz, Claus P. Jakob | 1984-03-06 |
| 4388213 | Cyclic amidine based corrosion inhibitors which inhibit corrosion caused by CO.sub.2 and H.sub.2 S | Knut Oppenlaender, Klaus Barthold | 1983-06-14 |
| 4388214 | Imidazoline based corrosion inhibitors which inhibit corrosion caused by CO.sub.2 and H.sub.2 S | Knut Oppenlaender, Klaus Barthold | 1983-06-14 |
| 4260724 | Preparation of polymaleic acids from maleic anhydride in the presence of acetic anhydride and of hydrogen peroxide | Johannes Perner, Knut Oppenlaender | 1981-04-07 |
| 4218218 | Stable finely dispersed aqueous formulations of disperse dyes and optical brighteners, and their use | Ewald Daubach, Manfred Herrmann, Knut Oppenlaender | 1980-08-19 |
| 4189445 | Surface-active phenolic derivatives | Knut Oppenlaender, Ewald Daubach, Manfred Herrmann | 1980-02-19 |