Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2007-11-27
2007-11-27
Lee, Benjamin C. (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S435000, C340S901000, C340S539100, C455S007000
Reexamination Certificate
active
11254028
ABSTRACT:
In a position detection system, a plurality of first communication devices each comprise a transmitter for transmitting a distance-calculation signal for calculating distance to the second communication device; a detector for detecting, by receiving from the second communication device a signal corresponding to the distance-calculation signal, phase difference between the distance-calculation signal when transmitted and the signal corresponding to the distance-calculation signal when received; and a calculator for calculating the distance to the second communication device, based on the phase difference. A second communication device comprises a transmitter for transmitting the signal corresponding to the distance-calculation signal. The position detection system comprises a determining unit for determining whether the multiple distances are below a predetermined distance; and a position detector for detecting the position of a relay device corresponding to the multiple distances when the determining unit has determined that the multiple distances are at or above the predetermined distance.
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European Search Report, Feb. 16, 2006, Reference PJC/G26971EP, App EP 05256473.9-2220.
Iketani Akira
Ishimura Shizuka
Lee Benjamin C.
Previl Daniel
Sanyo Electric Co,. Ltd.
Sereboff Steven C.
SoCal IP Law Group LLP
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