Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2007-10-16
2007-10-16
Lee, Benjamin C. (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S568100, C340S010100, C340S572800, C342S173000, C342S463000
Reexamination Certificate
active
10731789
ABSTRACT:
A method of identifying an article of interest includes providing one of a plurality of RF antennas each having a non-linear element which may be a rectifying diode and being resident at a different frequency on the article of interest. One RF antenna is interrogated with RF energy of a first frequency and converts the interrogated RF energy into a reflected energy of a different frequency. The reflected energy is sensed and on the basis of the different frequency determining if a specific antenna is present. The non-linear element may be a diode and is preferably a variable non-linear element. In another embodiment, the reflected RF energy is responsive to a change in ambient physical conditions such as pressure or temperature. Corresponding apparatus is provided.
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Capelli Christopher C.
Greene Charles E.
Mickle Marlin H.
Swift Harold
Eckert Seamans Cherin & Mellott , LLC
Lee Benjamin C.
Levy Philip E.
Previl Daniel
University of Pittsburgh - Of the Commonwealth System of Higher
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