Issued Patents All Time
Showing 51–60 of 60 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5080082 | Pressure regulating valve for crankcase ventilation in an internal combustion engine | Werner Schnabel | 1992-01-14 |
| 5028342 | Drilling mud additives based on a polymer mixture, their use, and a process for their production | Willy Opitz, Claus-Peter Herold, Stephan von Tapavicza | 1991-07-02 |
| 4964615 | Compositions for freeing jammed drill pipes | Claus-Peter Herold, Stephan von Tapavicza | 1990-10-23 |
| 4891154 | Defoaming agents and process of defoaming | Holger Tesmann, Hans-Ulrich Hempel, Margarete Gruenert, Adolf Asbeck | 1990-01-02 |
| 4888120 | Water-based drilling and well-servicing fluids with swellable, synthetic layer silicates | Claus-Peter Herold, Stephan van Tapavizca, Hans Dolhaine, Wolfgang von Rybinski, Winfried Wichelhaus | 1989-12-19 |
| 4851142 | Fluid loss additive for well drilling fluids | William Chrys Scoggins, Claus-Peter Herold | 1989-07-25 |
| 4802998 | Powder-form lubricant additives for water-based drilling fluids | Claus-Peter Herold | 1989-02-07 |
| 4655960 | Foam inhibitors for aqueous synthetic resin compositions | Juan C. Wuhrmann, Karl-Dieter Brands, Adolf Asbeck, Jochen Heidrich | 1987-04-07 |
| 4655961 | Foam inhibitors for aqueous dispersions and solutions of synthetic resins | Juan C. Wuhrmann, Karl-Dieter Brands, Adolf Asbeck, Jochen Heidrich | 1987-04-07 |
| 4599189 | Paraffin-containing defoaming compositions and detergent compositions containing same | Juan C. Wuhrmann, Karl-Dieter Brands, Klaus Schumann, Theodor Altenschoepfer | 1986-07-08 |