Issued Patents All Time
Showing 26–50 of 60 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE36066 | Use of selected ester oils in drilling fluids and muds | Claus-Peter Herold, Stephan von Tapavicza, Douglas J. Grimes, Jean-Marc Braun, Stuart Paul Smith | 1999-01-26 |
| 5755892 | Waste disposal of contaminated drill cuttings from geological drilling using drilling fluid systems containing mineral oil | Claus-Peter Herold, Stephan von Tapavizca, Malcolm Ellice, Douglas J. Grimes | 1998-05-26 |
| 5722358 | Tube with variable inside diameter | Rolf Fuesser, Georg Knoch, Helmut Spannbauer, Martin Weindorf | 1998-03-03 |
| 5663122 | Mineral additives for setting and/or controlling the rheological properties and gel structure of aqueous liquid phases and the use of such additives | Wolfgang Breuer, Claus-Peter Herold, Peter Kuhm, Stephan von Tapavicza | 1997-09-02 |
| 5649986 | Filter for filtering the intake air of an internal combustion engine | — | 1997-07-22 |
| 5508258 | Use of surface-active alpha-sulfo-fatty acid di-salts in water and oil based drilling fluids and other drill-hole treatment agents | Claus-Peter Herold, Johann F. Fues | 1996-04-16 |
| 5461028 | Fluid-drill-hole treatment agents based on carbonic acid diesters | Claus-Peter Herold, Alfred Westfechtel, Stephan von Tapavicza | 1995-10-24 |
| 5441156 | Process and recovering minerals from non-sulfidic ores by flotation | Bernd Fabry, Rita Koester, Hans-Christian Raths, Frank Wangemann | 1995-08-15 |
| 5441927 | Fluid drill-hole treatment agents based on polycarboxylic acid diesters | Claus-Peter Herold, Stephan von Tapavicza, Johann F. Fues | 1995-08-15 |
| 5421907 | Process for cold cleaning oil-contaminated metal surfaces with 2-ethylhexyl esters of fatty acids | Claus Nieendick, Karl Schmid, Claus-Peter Herold | 1995-06-06 |
| 5403822 | Esters of carboxylic acids of medium chain-length as a component of the oil phase in invert drilling muds | Claus-Peter Herold, Stephan von Tapavicza, Michael Neuss, Wolfgang Zoellner, Frank Burbach | 1995-04-04 |
| 5400753 | Air filter for internal combustion engines | Heinz Andress, Mario Rieger | 1995-03-28 |
| 5348938 | Oleophilic alcohols as a constituent of invert drilling fluids | Claus-Peter Herold, Stephan von Tapavicza | 1994-09-20 |
| 5322392 | Process for rock consolidation and/or cavity filling e.g. in tunnel construction and mining | Claus-Peter Herold, Stephan von Tapavicza, Helmut Edel | 1994-06-21 |
| 5318954 | Use of selected ester oils of low carboxylic acids in drilling fluids | Claus-Peter Herold, Stephan von Tapavicza, Michael Neuss, Frank Burbach | 1994-06-07 |
| 5318955 | Use of selected ethers of monofunctional alcohols in drilling fluids | Gerhard Stoll, Claus-Peter Herold, Stephan von Tapavicza | 1994-06-07 |
| 5318956 | Use of selected ester oils in water-based drilling fluids of the O/W emulsion type and corresponding drilling fluids with improved ecological acceptability | Claus-Peter Herold, Stephan von Tapavicza, Johann F. Fues | 1994-06-07 |
| 5254531 | Oleophilic basic amine compounds as an additive for invert drilling muds | Claus-Peter Herold, Stephan von Tapavicza | 1993-10-19 |
| 5252554 | Drilling fluids and muds containing selected ester oils | Claus-Peter Herold, Stephan von Tapavicza, Douglas J. Grimes, Jean-Marc Braun, Stuart Paul Smith | 1993-10-12 |
| 5232910 | Use of selected ester oils in drilling fluids and muds | Claus-Peter Herold, Stephan von Tapavicza, Douglas J. Grimes, Jean-Marc Braun, Stuart Paul Smith | 1993-08-03 |
| 5225452 | Silicone foam forming composition | Andre R. L. Colas | 1993-07-06 |
| 5199823 | Aqueous resin preparations and a process for stabilizing rock and plugging cavities | Claus-Peter Herold, Stephan von Tapavicza, Edmund Edel | 1993-04-06 |
| 5194422 | Use of selected oleophilic alcohols in water-based drilling fluids of the O/W-emulsion type and corresponding drilling fluids with improved ecological acceptability | Klaus Herold, Stephan von Tapavicza, Johann F. Fues | 1993-03-16 |
| 5106516 | Monocarboxylic acid methylesters in invert drilling muds | Claus-Peter Herold, Stephan von Tapavicza | 1992-04-21 |
| 5090191 | Tube gripping apparatus for a textile machine | — | 1992-02-25 |