Transistor having constant gain over a broad temperature range

Claim 1

IN AN AMPLIFYING CIRCUIT EMPLOYING AS ITS SIGNAL AMPLIFICATION MEANS AN N-P-N SILICON TRANSISTOR, THE METHOD OF ACHIEVING SUBSTANTIALLY CONSTANT CURRENT GAIN OVER A RANGE OF OPERATING TEMPERATURE FROM ABOUT 300* K. TO ABOUT 76* K. CONSISTING IN THE STEPS OF: (1) SELECTING AS SAID SIGNAL AMPLIFICATION MEANS A TRANSISTOR OF THE TYPE DESCRIBED WHOSE CURRENT GAIN, IN A NON-IRRIADIATED STATE, DESCREASES WITH DECREASING OPERATING TEMPERATURE FROM A HIGH POINT AT ABOUT 300* K. TO A VALLEY POINT AT ABOUT 135* K., THEREAFTER INCREASES TO A GAIN PEAK POINT AT ABOUT 76* K. AND THEREAFTER DECREASES TOWARD ZERO;