Windshield wiper construction

Claim 1

IN A WINDSHIELD WIPER CONSTRUCTION COMPRISING A WIPER SHAFT, A WIPER SUPPORTING ARM CONNECTED TO SAID SHAFT, A WIPER BLADE CHANNEL ELEMENT ATTACHED TO SAID ARM, AND A WIPER BLADE CARRIED BY SAID CHANNEL ELEMENT, SAID SHAFT AND SAID ARM DEFINING PASSAGES FOR THE MOVEMENT OF FLUID THERETHROUGH, THE IMPROVEMENT WHEREIN SAID WIPER BLADE COMPRISES A BASE PORTION, A CENTRALLY LOCATED PORTION DEPENDING FROM SAID BASE PORTION, AND SUBSTANTIALLY FLAT SIDE WALLS DEPENDING FROM SAID BASE PORTION ON OPPOSITE SIDES OF SAID CENTRALLY LOCATED PORTION, A PAIR OF INTERIOR PASSAGES DEFINED BY THE RESPECTIVE SIDE WALLS AND SAID CENTRALLY LOCATED PORTION AND EXTENDING ALONG THE LENGTH OF SAID BLADE, A CENTRAL HOLE IN SAID BASE PORTION COMMUNICATING SAID INTERIOR PASSAGES WITH SAID PASSAGES IN SAID SHAFT AND ARM, MEANS FOR CONNECTING THE PASSAGE IN SAID SHAFT TO A SOURCE OF HOT AIR, AND OPENINGS DEFINED BY SAID WIPER BLADE WHEREBY SAID HOT AIR CAN BE PASSED ONTO THE WINDSHIELD SURFACE, SAID OPENINGS COMPRISING LONGITUDINAL SLITS FORMED IN SAID SIDE WALLS AND DIVIDING THE SIDE WALLS INTO SEPARATE SECTIONS WHEREBY BENDING OF THE BLADE IN ONE DIRECTION DURING CONTACT WITH THE WINDSHIELD SURFACE WILL OPEN ONE SIDE OF THE BLADE FOR PASSAGE OF AIR OUT OF ONE OF SAID LATERALLY SPACED PASSAGES, WHILE BENDING OF THE BLADE IN THE OTHER DIRECTION WILL OPEN THE OTHER SIDE OF SAID BLADE.