Electrical heat exchanger

Claim 1

A HEAT EXCHANGER COMPRISING A METALLIC BASE PLATE COMPRISING AN OUTER CIRCULAR PERIPHERAL PORTION, SAID BASE PLATE HAVING A CIRCULAR GROOVE THEREIN INCLUDING TWO TERMINAL PORTIONS ADJACENT EACH OTHER, TWO MUTUALLY ADJACENT PARALLEL GROOVES IN SAID BASE PLATE EXTENDING INWARDLY FROM SAID OUTER CIRCULAR PERIPHERAL PORTION AND INTO SAID TWO TERMINAL PORTIONS, AND ELONGATED ELECTRICAL HEATER DISPOSED IN SAID CIRCULAR GROOVE AND EXTENDING FROM SAID CIRCULAR GROOVE INTO SAID TWO MUTUALLY ADJACENT PARALLEL GROOVES, SAID CIRCULAR GROOVE AND SAID PARALLEL GROOVES EACH COMPRISING PARALLEL WALLS, SAID WALLS AS SEEN IN CROSSSECTION BEING DEFINED BY RECTILINEAR PARALLEL LINES, SAID CIRCULAR GROOVE AND SAID TWO MUTUALLY ADJACENT PARALLEL GROOVES FURTHER COMPRISING OPPOSITELY DISPOSED CURVED WALL PORTIONS INTERSECTING SAID PARALLEL WALLS AND FORMING SHOULDERS THEREWITH, SAID ELECTRICAL HEATER BEING IN CONTINUOUS AND INTIMATE CONTACT WITH SAID WALL PORTIONS AND WITH THE BOTTOMS OF SAID CIRCULAR GROOVE AND OF SAID PARALLEL GROOVES, SAID SHOULDERS IN SAID CIRCULAR GROOVE AND IN SAID TWO ADJACENT PARALLEL GROOVES BEING EFFECTIVE TO PREVENT ACCIDENTAL DISLODGEMENT OF SAID ELECTRICAL HEATER FROM EACH OF SAID GROOVES.