Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Reexamination Certificate
2005-06-21
2005-06-21
Phan, Dao (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
C455S456100
Reexamination Certificate
active
06909399
ABSTRACT:
A radio signal based object location system is provided wherein location devices are provided on articles for use in locating the articles, and wherein a database is maintained relating characteristics of radio signal transmissions between the location devices and fixed devices to locations within an area. A method is provided for maintaining the database to reflect propagation conditions. Location devices are provided at fixed positions within the area. Data representing radio signal transmission characteristics between the fixed position location devices and fixed devices is recorded. Transmissions between the fixed position location devices and the fixed devices is monitored to determine changes in the characteristics of radio signal transmissions from the recorded data.
REFERENCES:
patent: 6483461 (2002-11-01), Matheney et al.
patent: 6542083 (2003-04-01), Richley et al.
patent: 6708879 (2004-03-01), Hunt
Copending U.S. Appl. No. 09/528,697 filed Mar. 17, 2000.
Enhancements to the User Location and Tracking System, by Paramvir Bahl and Venkata N. Padmanabhan, Microsoft Technical Report MSR-TR-99-12, dated Feb. 1999, published by Microsoft Research.
User Location and Tracking in an In-Building Radio Network, by Paramvir Bahl and Venkata N. Padmanabhan, Microsoft Technical Report MSR-TR-99-12, dated Feb. 1999, by the same authors, published by Microsoft Research.
Goren David P.
Zegelin Chris
Baker & Botts LLP
Phan Dao
Symbol Technologies Inc.
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