Anti-leakage or anti-return valves

Full Title

Filtering devices having features not specifically covered by groups , or for applications not specifically covered by groups; Auxiliary devices for filtration; Filter housing constructions > Safety devices specially adapted for filtration; Devices for indicating clogging > Anti-leakage or anti-return valves

Classification Context

Section:

PERFORMING OPERATIONS; TRANSPORTING

Class:

PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL

Subclass:

SEPARATION