Issued Patents 1994
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |