Communications: electrical – Continuously variable indicating – With meter reading
Patent
1987-11-25
1989-08-15
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082534, 34082554, 2353825, G06K 500, H04Q 148
Patent
active
048579130
ABSTRACT:
The invention relates to electronic badges equipping portable objects, such as plastified cards and capable of being identified at a distance by suitable readers in order to ensure operation such as the unlocking of a lock. These badges are of a passive type, that is to say supplied exclusively from the outside by inductive coupling and they are in addition of a type reprogrammable through channels, each comprising an inductive coupling (at the level of inductances) from a suitable apparatus. The circuitry for forming the binary coded identification signals of the badge comprise a dead memory, a life memory or buffer and a rapid reading and writing circuit which provides the connections between these two memories, as well as the connections between the dead memories and the reprogramming channels.
REFERENCES:
patent: 4631708 (1986-12-01), Wood et al.
patent: 4661691 (1987-04-01), Halpern
patent: 4724427 (1988-02-01), Carroll
National Semiconductor: "NMC9306/COP494 256-Bit Serial Electrically Erasable Programmable Memory", Feb. 1983; pp. 1-6.
Hennion Claude
Leonard Didier
Lewiner Jacques
Palladino Brian S.
Societe Fontaine
Yusko Donald J.
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