Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Publication of BE553331ApublicationCriticalpatent/BE553331A/fr
B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
B01D—SEPARATION
B01D37/00—Processes of filtration
B01D37/02—Precoating the filter medium; Addition of filter aids to the liquid being filtered
B—PERFORMING OPERATIONS; TRANSPORTING
B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
B01D—SEPARATION
B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
B01D29/48—Edge filtering elements, i.e. using contiguous impervious surfaces of spirally or helically wound bodies