Furnace for high-frequency heating with the aid of oscillations of very high frequency

Claim 1

HIGH FREQUENCY HEATING APPARATUS COMPRISING A HIGH FREQUENCY GENERATOR AND A WAVEGUIDE SYSTEM, SAID WAVEGUIDE SYSTEM COMPRISING AN ENCLOSURE HAVING AN OPEN END AND COMPRISING FIRST AND SECOND SUBSTANTIALLY PARALLEL SPACED APART WALL PORTIONS, A THIRD WALL PORTION HAVING A SUBSTANTIALLY PARABOLIC CONTOUR ARRANGED AT RIGHT ANGLES TO AND BOUNDING SAID FIRST AND SECOND WALL PORTIONS AND EXTENDING SUBSTANTIALLY FROM ONE END OF THE SAID OPEN END TO A PREDETERMINED POINT OF SAID FIRST AND SECOND WALL PORTIONS REMOTE FROM SAID OPEN END, SAID PARABOLIC PORTION DEFINING A FOCAL LINE AT A POSITION AT ONE SIDE OF SAID OPEN END, ENERGY RADIATING MEANS DISPOSED AT SAID FOCAL LINE AND ARRANGED TO RADIATE THE HIGH FREQUENCY ENERGY TOWARDS SAID PARABOLIC SURFACE, MEANS FOR COUPLING SAID GENERATOR TO SAID RADIATING MEANS, A FOURTH WALL PORTION BOUNDING SAID FIRST AND SECOND WALL PORTION AND EXTENDING BETWEEN SAID RADIATING MEANS AND SAID PREDETERMINED POINT, A FIFTH WALL PORTION FORMING A BOUNDARY SURFACE EXTENDING BETWEEN SAID RADIATING MEANS AND SAID OPEN END AND ARRANGED TO INTERCEPT THE PORTION OF DIRECT ENERGY RADIATION EMANATING FROM SAID RADIATING MEANS TOWARDS SAID OPEN END OF SAID ENCLOSURE, AND MEANS FOR SUPPORTING OBJECTS TO BE HEATED AT SAID OPEN END OF SAID ENCLOSURES.