Temperature compensating zener diode construction

Claim 1

A DOUBLE ZENER DIODE OF THE TYPE WHOSE MEANS OF CONNECTION INTO EXTERNAL CIRCUITRY CONSISTS TO TWO TERMINALS SAID DIODE COMPRISING A MASS OF SEMI-CONDUCTOR MATERIAL SELECTED FROM THE GROUP CONSISTING OF N AND P TYPES AND HAVING TWO SIDES, A FIRST CONDUCTIVE MATERIAL IN CONTACT WITH A FIRST OF SAID SIDES AND PROVIDING A P-N JUNCTION AT SAID FIRST SLIDE, AND A SECOND CONDUCTIVE MATERIAL IN CONTACT WITH THE SECOND OF SAID SIDES AND PROVIDING A P-N JUNCTION AT SAID SECOND SIDE, THE TWO-P-N JUNCTION BEING OPPOSED TO EACH OTHER IN POLARITY, SAID FIRST AND SECOND CONDUCTIVE MATERIAL CONSTITUTING SAID TWO TERMINALS RESPECTIVELY, A FIRST OF SAID JUNCTIONS PROVIDING A VOLTAGE-CURRENT CHARACTERISTIC IN THE DIRECTION OF REVERSE CURRENT FLOW WHICH VARIES WITH THE TEMPERATURE OF DIODE, AND THE SECOND OF SAID JUNCTINS PROVIDING A VOLTAGE-CURRENT CHARACTERISTIC IN THE DIRECTION OF FORWARD CURRENT FLOW WHICH ALSO VARIES WITH THE TEMPERATURE OF THE DIODE, THE SAID VARIATIONS DUE TO TEMPERATURE, OF THE TWO VOLTAGE-CURRENT CHARACTERISTICS COMPENSATING EACH OTHER.