Electronic latching networks employing elements having positive temperature coefficients of resistance

Claim 1

A latching network comprising at least first and second groups of transistors, each of said groups including first and second transistors each having input, output and common electrodes, in each of said groups, means interconnecting said first and second transistors of said group to turn on and off said second transistor of said group when said first transistor of said group is turned on and off respectively; in each of said groups, a device having a positive temperature coefficient of resistance and a first resistor connected in series circuit with each other and with said output and common electrodes of said second transistor of said group; in each of said groups, means for supplying a voltage developed across said first resistor to said input electrode of said first transistor of said group to hold said first transistor of said group on when said second transistor of said group is turned on; in each of said groups, means for turning on said first transistor of said group; and a resistor common to all of said groups and connected in circuit with said output and common electrodes of said first transistors of said groups and across which a voltage is developed in response to conduction of any one of said first transistors and applied to all others of said first transistors to turn off any other conductive one of said first transistors.