Electric heating means to remove and prevent formation of frost and mist on vehicle windscreens

Claim 1

IN A MOTOR VEHICLE, A WINDSCREEN HAVING AN INER SURFACE, A SHEET OF TRANSPARENT MATERIAL LOCATED ADJACENT AND SPACED FROM SAID INNER SURFACE OF SAID WINDSCREEN, ELONGATED, ENDLESS SEALING MEANS EXTENDING BETWEEN AND ENGAGING SAID TRANSPARENT SHEET AND SAID WINDSCREEN AT THE INNER SURFACE OF THE LATTER FOR DEFINING WITH SAID WINDSCREEN AND TRANSPARENT SHEET A HOLLOW, HERMETICALLY SEALED SPACE, ELECTRICAL HEATING MEANS ADJACENT SAID SPACE, ROTARY FAN MEANS FOR DIRECTING AIR PAST AND INTO ENGAGEMENT WITH SAID ELECTRICAL HEATING MEANS TO BE HEATED THEREBY, SAID FAN MEANS HAVING AN AIR OUTLET AND AN AIR INLET, AND AIR-CONDUCTING TUBULAR MEANS CONNECTING SAID SPACE WITH SAID FAN MEANS FOR PROVIDING IN SAID SPACE A CONTINUOUS FLOW OF HEATED AIR WHICH UNIFORMLY HEATS AAID SPACE, SAID SPACE HAVING A PAIR OF OPPOSED LOWER CORNERS AND SAID AIR-CONDUCTING TUBULAR MEANS HAVING A PAIR OF TUBES RESPECTIVELY HAVING OPEN END SITUATED AT SAID LOWER CORNERS