| 摘要 |
A filter comprises filter particle layer regions (3) and filter particle-free regions (4) between a pair of casing layers (1, 2). An Independent claim is also included for production of a filter, especially as described above, by distributing filter particles (3) in certain regions between a pair of casing layers (1, 2) while leaving one or more other regions (4) empty and then joining the casing layers together in the empty region(s).
|
