Air filter assembly

Claim 1

AN AIR FILTER ASSEMBLY COMPRISING: HOUSING MEANS INCLUDING AN ANNULARLY SHAPED SIDE WALL UPSTANDING FROM A BOTTOM WALL, SAID ANNULARLY SHAPED SIDE WALL HAVING AN AIR INLET OPENING FOR THE ENTRANCE OF AIR INTO SAID HOUSING, SAID BOTTOM WALL HAVING AN AIR DISCHARGE PORT FOR THE PASSAGE OF FILTERED AIR FROM SAID HOUSING, AN ANNULARLY SHAPED FILTER ELEMENT WITH FILTERING SURFACES FACING TOWARD SAID ANNULAR SIDE WALL, A COVER PLATE FOR ENCLOSING THE TOP SURFACE OF SAID FILTER ELEMENT, A PLURALITY OF TURBINE BLADES EXTENDING OUTWARDLY BEYOND THE OUTER ANNULAR EDGE OF THE COVER PLATE AND LOCATED BETWEEN SAID FILTER ELEMENT AND SAID SIDE WALL OF THE HOUING MEANS, SAID TURBINE BLADES DRIVINGLY COUPLED VIA THE COVER PLATE TO SAID FILTER ELEMENT FOR ROTATING IT WITHIN THE HOUSING, THE FACING SURFACES OF SAID BLADES LYING IN PLANES INTERSECTING SAID BOTTOM WALL, SAID HOUSING INCLUDING A COVER JOINED TO THE SIDE WALL FOR ENCLOSING SAID FILTER ELEMENT, MEANS FOR ROTATABLY SUPPORTING SAID ANNULAR FILTER ELEMENT WITHIN SAID HOUSING MEANS, AN NNULAR PLATE ENCLOSING THE BOTTOM SURFACE OF SAID FILTER ELEMENT, SAID ANNULAR PLATE INCLUDING MEANS SURROUNDING A CENTRALLY LOCATED ANNULAR PORT THEREIN AND EXTENDING INTO A ROTATABLE AND ENCLOSING RELATION WITH SAID AIR DISCHARGE PORT FOR DELIVERING FILTERED AIR INTO THE AIR DISCHARGE PORT, AND MEANS FOR DIRECTING A STREAM OF AIR THROUGH THE INLET OPENING IN SAID SIDE WALL INTO SAID HOUSING MEANS IN A GENERALLY TENGENTIAL DIRECTION TOWARD SAID ANNULARLY SHAPED FILTER ELEMENT FOR IMPINGING CONTACT WITH SAID TURBINE BLADES TO ROTATE SAID FILTER ELEMENT TO CHANGE FILTERING SURFACES THEREOF DIRECTED TOWARD THE STREAM OF AIR.