Patent ID: 7997420

Claim:
A filter apparatus capable of releasing air from a filter body, comprising: a holder having a front panel and a rear panel, which are connected to each other by a connecting portion and stand in parallel with each other, wherein the front panel has a center cutout; a generally cylindrical filter body sandwiched between the front panel and the rear panel of the holder so as to be able to rotate around its axis of rotation, wherein the filter body comprises a fluid inlet located at the axis of rotation and rotatably held in the center cutout of the front panel of the holder, and a fluid outlet located in the vicinity of the circumference of the filter body, wherein the front panel of the holder further comprises: an engaging portion for temporarily engaging the fluid outlet at an air releasing position and a filtering position, respectively, when the filter body is rotated in a clockwise direction and counterclockwise direction about the axis of rotation with the fluid inlet being held in the center cutout of the holder; fixing means for temporarily fixing the filter body at each engaging position so as not to rotate the filter body; and means for easily rotating the filter body.