Abstract: Electronic door lock system for use with a door mounted in a door frame and has a dead bolt and a latch mounted on the door. A control unit is mounted on the door in the vicinity of the dead bolt and the latch and includes a battery and electronic circuitry connected to the battery and manually operable contacts for selectively operating the dead bolt and the latch so that they can be moved to unlatched positions under the control of first and second hand-operated members.

Abstract: Electronic access card comprising a printed circuit board. A microprocessor is carried by the printed circuit board. A plurality of keys are carried by the board. A matrix connects the keys to the microprocessor. A clock is coupled to the microprocessor. A battery is carried by the printed circuit board and coupled to the microprocessor. A coil serving as a transducer is carried by the printed circuit board and is coupled to the microprocessor and to the battery so that when keys are operated the keys are polled by the microprocessor and information is obtained from the keys supplied by the microprocessor to the transducer.

Abstract: A lock box in a secure entry system for use with a source of DC power having high frequency pulse width with modulation thereon comprising a housing and a key container mounted in said housing movable between accessible and inaccessible positions. Circuitry is provided within the housing for controlling the movement of the key container and is adapted to be connected to the source of DC power. The circuitry includes a filter having a capacitor. The circuitry is capable of receiving the high frequency pulse width modulated DC power. The capacitor serves to supply at least some of the power required by the circuitry during the time the pulse width modulation is occurring on the DC power supplied. A latch mechanism is provided to prevent opening of the key container to an accessible position by hammer blows applied to the housing.

Abstract: Card for use in a security system having at least two rows of spaced apart metallic elements with a predetermined arrangement so that the metallic elements are encoded with a non-erasable code. An opaque material encases the metallic elements to form a card-like member and to make the metallic elements invisible to the human eye.Method for forming a card for use in a security system which comprises a metallic planar sheet and removing material from the sheet to provide a plurality of metallic elements arranged in at least two rows. At least portions of at least certain of the metallic elements are removed to place a unique code in the elements. The elements are then encased in an opaque material to form a card-like member and to conceal the metallic elements from the human eye.

Abstract: Electronic access card comprising a printed circuit board. A microprocessor is carried by the printed circuit board. A keyboard is carried by the printed circuit board and is connected to the microprocessor for inserting information into the microprocessor. A coil is carried by the printed circuit board and is coupled to the microprocessor for receiving information to be conveyed to the microprocessor and for transmitting information from the microprocessor. Visual display means is coupled to the microprocessor for visually displaying information which is carried in the microprocessor.