Perforated drum type liquid filter

Claim 1

A FILTER HAVING, IN COMBINATION, A TANK ADAPTED TO CONTAIN A BODY OF LIQUID TO BE FILTERED, A DRUM HAVING A PERFORATED PERIPHERY MOUNTED WITHIN SAID TANK TO TURN ABOUT A HORIZONTAL AXIS, SAID TANK HAVING A TOP WALL WITH AN ELONGATED OPENING THEREIN EXTENDING ACROSS THE TANK ABOVE SAID DRUM, A TAKE-UP ROLL DISPOSED OUTSIDE OF SAID TANK AND SUPPORTED TO TURN ABOUT AN AXIS PARALLELING SAID DRUM AXIS, SAID TANK HAVING A SECOND AND SLOT-LIKE TOP OPENING HORIZONTALLY SPACED FROM SAID FIRST OPENING, A SUPPLY ROLL MOUNTED OUTSIDE OF SAID TANK TO TURN ABOUT AN AXIS PARALLEL TO SAID MAKE-UP ROLL AND SAID OPENINGS, A FLEXIBLE FILTER WEB WOUND ON SAID SUPPLY ROLL AND EXTENDING DOWNWARDLY THROUGH SAID SECOND OPENING AND INTO SAID TANK, MEANS GUIDING SAID WEB WITHIN THE TANK FIRST TANGENTIALLY ONTO SAID DRUM ABOVE THE LEVEL OF SAID LIQUID, DOWNWARDLY AROUND THE DRUM AND UPWARDLY OFF FROM THE LATTER ONTO SAID TAKE-UP ROLL, MEANS DEFINING SAID SECOND OPENING AND SEALING THE PASSING WEB AGAINST THE EDGES THEREOF WHEREBY TO MINIMIZE THE ESCAPE OF VAPORS UPWARDLY FROM THE TANK, THROUGH SAID OPENING AND INTO CONTACT WITH SAID SUPPLY ROLL, SAID SEALING MEANS INCLUDING A MEMBER DEFINING ONE WALL OF SAID SECOND OPENING, EXTENDING ACROSS THE FULL LENGTH OF THE OPENING, AND YIELDABLY BIASED TOWARD SAID WEB TO HOLD THE SAME AGAINST THE OPPOSITE WALL OF THE OPENING.