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US 3,944,976 AGranted
Electronic security apparatus
OwnerRode Franceinventor
Life of this patent
Estimating the term…
Abstract
An improved electronic lock includes a random bit-pattern generator which may be selectively cycled through a plurality of bit-pattern combinations to provide a code that can be stored in a mating electronic key. Several bit-patterns or codes may be stored in a single key for convenient use in operating a corresponding number of separate locks.
Claims11
Electronic security apparatus comprising:
- a first set of a plural number N of logic elements capable of attaining distinct logic states interconnected to provide a plurality of logic states or bits;
- first gate means having an input connected to the output of the Nth logic element of the first set and having an output connected to the first of the N number of logic elements of the first set for operation therewith as a shift register which produces a selectably changeable pattern of logic states in the first set;
- a second set of a plural number of at least N logic elements capable of attaining distinct logic states and interconnected to provide a plurality of logic states or bits;
- second gate means having an input connected to the output of the Nth logic element of the second set and having an output connected to the first of the N number of logic elements of the second set for operation therewith as a shift register which produces a selectably changeable pattern of logic states in the second set;
- third gate means having an input port connected to the output of the Nth logic element of the first set and having another input port for receiving manifestations of logic states attained by the second set of logic elements for serial comparison with the logic states attained by said first set of logic elements to provide an output signal indicative of parity of compared logic states;
- transfer means selectively enabled to couple the logic elements of the first set to the logic elements of the second set for selectively transferring the pattern of logic states from one set to the other set of logic elements;
- means for selectively coupling an output of said second set of logic elements to said other input port of the third gate means for selectively comparing therein the logic states serially received from said first and second sets of logic elements;
- and
- utilization means connected to said third gate means for responding to said output signal upon occurrence of parity of compared logic states.
6 more elements
Electronic security apparatus for operation with a motorized vehicle, the apparatus comprising:
- a first set of a plural number N of logic elements capable of attaining distinct logic states interconnected to provide a plurality of logic states or bits;
- a second set of a plural number of at least N logic elements capable of attaining distinct logic states and interconnected to provide a plurality of logic states or bits;
- comparator means selectively connectable to the logic elements of the first and second sets for selectively comparing therein the logic states received from the first and second sets of logic elements for producing an output signal indicative of parity of compared logic states;
- utilization means coupled to said comparator means for rendering the motorized vehicle operable in response to said output signal;
- an odometer of said vehicle which produces signal manifestations of displayed mileage digits;
- an auxiliary set of logic elements carried with said second set for selectively retaining logic states;
- and
- logic means connected to receive said signal manifestations and the logic states attained by said first set of logic elements for transferring to the auxiliary set of logic elements an output manifestation of the mileage change indicated on the odometer with respect to the logic states of the first set of logic elements during which the odometer indication of mileage changed.
5 more elements
Dependencies are inferred from the claim text.