Location aware device

Details Location aware device Location aware device

2005-12-20

2005-12-20

Crosland, Donnie L. (Department: 2636)

Communications: electrical

Condition responsive indicating system

With particular coupling link

C340S870030, C340S539220, C340S539100, C340S539230, C340S870030, C342S450000

Reexamination Certificate

active

06977587

ABSTRACT:
A device having a signal module configured to transmit a first type of signal and a second type of signal and to receive the first type of signal and the second type of signal. The device also includes a timer and a controller configured to operate the signal module and timer. The controller is operable to determine a location of the device with respect to another device based upon the time elapsed between transmission and receipt of the first type of signal and transmission and receipt of the second type of signal.

REFERENCES:
patent: 4041470 (1977-08-01), Slane et al.
patent: 5651517 (1997-07-01), Stevens et al.
patent: 6493649 (2002-12-01), Jones et al.
patent: 2003/0033032 (2003-02-01), Lind et al.
patent: 2004/0028023 (2004-02-01), Mandhyan et al.
Ainsworth, Diane, “‘Smart’ sensors promise savings in electricity costs”, Berkeleyan, www.berkeley.edu
ews/berkeleyan/2001/06/07—smart.html, Jun. 15, 2001.

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