Didier-Werke AG
207Patents
0Active
207Granted
42Portfolio score
Filing activity: Sep 25, 1975 → Oct 15, 2001
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5552213A | Refractory fiber structures | Emerging Cross-Sectional Technologies | 49 | Expired |
| US4737326A | Refractory shapes of ceramic fiber-containing material | Mechanical Engineering; Lighting; Heating | 45 | Expired |
| US5346868A | Inorganic fiber | Textiles; Paper | 41 | Expired |
| US4895821A | Process for the manufacture of catalytic elements and catalytic elements so produced | Performing Operations; Transporting | 29 | Expired |
| US4735756A | Method for producing light-weight molded articles containing ceramic fibers | Emerging Cross-Sectional Technologies | 23 | Expired |
| US4179046A | Refractory plate for slide closures of metallurgical vessels | Performing Operations; Transporting | 22 | Expired |
| US4762689A | Combination of retaining module and catalyst plates | Performing Operations; Transporting | 22 | Expired |
| US5102055A | Apparatus and process for disintegrating a fiber agglomerate | Emerging Cross-Sectional Technologies | 18 | Expired |
| US4950473A | Method for reducing nitrogen oxides in flue gas | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US4182466A | Wear part for sliding gates and process for the production of such wear parts and sliding gate with such wear parts | Performing Operations; Transporting | 18 | Expired |
| US4710480A | Method of ceramic molding which produces a porosity gradient and the manufacture of compound moldings using this method | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4935392A | Process for the manufacture of catalyst members for the reduction of oxides of nitrogen and catalyst members produced thereby | Performing Operations; Transporting | 15 | Expired |
| US5420087A | Refractory or fireproof brick as tin bath bottom brick | Chemistry; Metallurgy | 15 | Expired |
| US5603887A | Process of making refractory fiber structures | Emerging Cross-Sectional Technologies | 14 | Expired |
| US4760047A | Catalyst block | Performing Operations; Transporting | 13 | Expired |
| US4806427A | Process for the production of catalysts for the reduction of nitrogen oxides from exhaust gases and similar chemical air cleaning processes | Performing Operations; Transporting | 13 | Expired |
| US4484617A | Method of using and storing energy from the environment | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4729974A | Magnesia and spinel refractory brick | Chemistry; Metallurgy | 12 | Expired |
| US4365788A | Process and apparatus for determining the level of molten metal in a metallurgical vessel, the temperature of the molten metal and the extent of wear of the refractory lining of the vessel | Performing Operations; Transporting | 12 | Expired |
| US4508324A | Fastening means for a closure plate on a sliding shutter outlet in a vessel which contains molten metal | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4331471A | Method and device for installing and replacing a gas permeable insert in the wall of a vessel and for the introduction of gas therethrough | Emerging Cross-Sectional Technologies | 11 | Expired |
| US5205850A | Particular filter | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4555050A | Closure mechanism with gas seal | Performing Operations; Transporting | 11 | Expired |
| US4677731A | Process and device for mounting porous ceramic material | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4742036A | Catalyst plate | Performing Operations; Transporting | 10 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.