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| Number | Title | Issue Date |
| 6375915 | Method of regenerating a spent pickling solution In a method of regenerating a spent pickling solution composed of nitric acid and hydrofluoric acid and containing metal fluorides and metal nitrates, the pickling solution is heated in a reactor to about 300-1,000° C., the metal fluorides and the metal ... | 04/23/2002 |
| 5840173 | Process for treating the surface of material of high-grade steel A process for treating the surface of material composed of high-grade steel, particularly strip-shaped material, wherein the material is treated with a pickling solution in a least one container and is subsequently rinsed. The solution used as the picklin... | 11/24/1998 |
| 5759307 | Method of producing a cold-rolled strip in one pass A method of producing a cold-rolled strip from a stainless, ferretic or austenitic high-grade steel or a titanium alloy, wherein the strip which has been wound into a coil and has been manufactured by a hot-rolling or casting process is subjected in one p... | 06/02/1998 |
| 5545260 | Pickling installation and method for operating this pickling installation A method operating a pickling installation for pickling rolled strips comprises several consecutively disposed pickling basins filled with a pickling agent containing acid, through which the strip 4 is passed. A pickling agent containing acid is injected ... | 08/13/1996 |
| 4976751 | Method for purification of exhaust air In a known method for the purification of exhaust air containing impurities which are biologically degradable and difficultly soluble in water, by means of activated sludge washing liquid in an absorption tower, pulverized activated carbon is added to the... | 12/11/1990 |
| 4800128 | Chemical attack-resistant, liquid-tight lining A liquid-tight lining which is resistant to chemical attack for catch reservoirs, containers or the like of concrete. The lining includes a continuous liquid-tight impervious layer provided above the surface of the concrete. To make possible a simple and ... | 01/24/1989 |
| 4723968 | Method and apparatus for the purification of waste air containing biologically decomposable impurities A method and an apparatus for the purification of waste air containing biologically decomposing impurities. The waste water is conducted through an absorption tower in which the impurities are absorbed by washing liquid containing an activated sludge. Sub... | 02/09/1988 |
