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B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
B01D—SEPARATION
B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
B01D35/147—Bypass or safety valves
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FR857059D1939-06-281939-06-28Filtre pour liquides tels que l'huile de graissage
ExpiredFR857059A
(fr)