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| Number | Title | Issue Date |
| 5837035 | Method and apparatus for electrostatically precipitating impurities, such as suspended matter or the like, from a gas flow The present invention relates to a method and an apparatus for electrostatically precipitating suspended matter from a gas flow, wherein a precipitation electrode which is flown through by the gas flow is provided in the form of a perforated plate behind ... | 11/17/1998 |
| 5240587 | Method of producing a filter material The present invention relates to a method of producing a filter material and to a filter material produced by the described method. The method comprises the steps of providing a substrate and forming an electrically conductive structure on the substrate. ... | 08/31/1993 |
