Registers – Records
Reexamination Certificate
1997-06-10
2001-10-09
Frech, Karl D. (Department: 2876)
Registers
Records
C235S491000
Reexamination Certificate
active
06299068
ABSTRACT:
It is possible with existing means to implement autonomous optoelectronic labels incorporating a nonvolatile memory and which can be supplied, read or read-written in remote manner. Labels of this type are described in French patent application FR 2,548,803 and U.S. Pat. No. 5,354,979. FR 2,548,803 defining the closest prior art is mentioned in the preamble of the independent claim. Swiss patent application 02 120/94-0 of Mar. 7, 1994 describes another label of this type more particularly concentrating on the optoelectronic means to be implemented in order to remotely supply said label, as well as for delivering and receiving informations by optical signals. It is obvious that, independently of the optoelectronic part, the procedures which control the communication between the label and the external read-write means have the greatest importance and condition the reliability of such a label.
The object of the present invention is to propose an optielectronic label having simple and effective means for controlling said communication. This optoelectronic label having at least one electronic memory able to maintain its state in the absence of a power supply, a control circuit for said memory, and a combination of electrooptical means arranged in such a way as to supply said label and transmit light signals to the outside, is characterized in that it has a time base controlling a sequence generator connected at least indirectly to subassemblies to subsystems constituting said label, said generator being arranged in such a way as to deliver light signals of characterized sequences making it possible to transmit to the outside informations concerning said subassemblies or subsystems.
REFERENCES:
patent: 4877945 (1989-10-01), Fujisaki
patent: 5354979 (1994-10-01), Adelson
patent: 0461878 A2 (1991-12-01), None
patent: 2548803 B1 (1985-01-01), None
patent: 2 548 803 (1985-01-01), None
patent: 2636188 A1 (1990-03-01), None
patent: 2196203 A (1988-04-01), None
Frech Karl D.
Oppedahl & Larson LLP
Valtac, Alex Beaud
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