Patent ID: 9480943
Filing Date: 2016-11-01
CPC Classification: B01D,F02M

Claim Text:
1. A filter device for an exchange of gas between a fuel tank for liquid fuel and an environment, the filter device comprising: a chamber sealed in a fluid-tight manner, the chamber being divided into a first section, a second section connected in series downstream of the first section, a third section connected in series downstream of the second section and a fourth section connected in series downstream of the third section; a first port leading into the first section of the chamber and providing fluid connection to the fuel tank; a second port leading into the fourth section of the chamber and providing a fluid connection to the environment; a third port leading from the first section of the chamber and providing fluid connection to an internal combustion engine; a granular filter material in the first and second sections of the chamber; and the third and fourth sections of the chamber being configured for optionally accommodating at least one monolithic filter element, and the at least one monolithic filter element being provided in at least one of the third and fourth sections of the chamber in addition to the granular filter material in the first and second sections of the chamber to achieve a specified filtering capacity.