Electronic secure entry system, apparatus and method

Details Electronic secure entry system, apparatus and method Electronic secure entry system, apparatus and method

1987-09-30

1989-02-28

Dwyer, James L.

Communications: electrical

Continuously variable indicating

With meter reading

379103, 235449, H04M 1100, G06K 708

Patent

active

048089931

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.

REFERENCES:
patent: 3943335 (1976-03-01), Kinker et al.
patent: 4507550 (1985-03-01), Fleer

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