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Class Information
Number: 340/539.21
Name: Communications: electrical > Condition responsive indicating system > With particular coupling link > Radio > Including central station detail > Signal strength
Description: Subject matter wherein an amplitude of a signal present at the central station is determined.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7423516 |
Systems and methods for approximating the location of an RFID tag |
Sep. 9, 2008 |
| 7403744 |
Self-associating wireless personal area network |
Jul. 22, 2008 |
| 7394364 |
Wireless item location monitoring system and method |
Jul. 1, 2008 |
| 7388500 |
Enhanced mechanism for radio frequency identification reader |
Jun. 17, 2008 |
| 7385502 |
Locator beacon |
Jun. 10, 2008 |
| 7378967 |
RFID tag sensitivity |
May. 27, 2008 |
| 7356071 |
Method and apparatus for estimating signal-to-noise ratio based on dedicated physical channel pilot symbols |
Apr. 8, 2008 |
| 7346477 |
Testing a station's response to a reduction in wireless signal strength |
Mar. 18, 2008 |
| 7323988 |
Personal item reminder |
Jan. 29, 2008 |
| 7323991 |
System and method for locating and communicating with personnel and equipment in a facility |
Jan. 29, 2008 |
| 7321297 |
Property supervisory control system |
Jan. 22, 2008 |
| 7312711 |
Method and apparatus for a wireless tether system |
Dec. 25, 2007 |
| 7295109 |
Monitoring system |
Nov. 13, 2007 |
| 7292137 |
Energy efficient passive entry system |
Nov. 6, 2007 |
| 7283048 |
Multi-level meshed security network |
Oct. 16, 2007 |
| 7274292 |
Proximity management system and method using radio-frequency identification tags |
Sep. 25, 2007 |
| 7271736 |
Emergency vehicle alert system |
Sep. 18, 2007 |
| 7271715 |
Personal articles tracking |
Sep. 18, 2007 |
| 7265679 |
Apparatus and method for indicating onset of high-voltage at an output locus of a signal converter device |
Sep. 4, 2007 |
| 7259682 |
Child distance and water immersion alarm |
Aug. 21, 2007 |
| 7256694 |
Automatic lid opening and closing system for a waste container |
Aug. 14, 2007 |
| 7242290 |
Testing methods for use with boxes |
Jul. 10, 2007 |
| 7233242 |
Arrangement and method for setting a transmit power |
Jun. 19, 2007 |
| 7190264 |
Wireless computer monitoring device with automatic arming and disarming |
Mar. 13, 2007 |
| 7170426 |
Systems and methods for proximity control of a barrier |
Jan. 30, 2007 |
| 7151446 |
System for tracking and locating an object using a cellular network |
Dec. 19, 2006 |
| 7151441 |
Vehicle burglar alarm system with GPS recognition |
Dec. 19, 2006 |
| 7148802 |
Direction finder and locator |
Dec. 12, 2006 |
| 7142120 |
Item finding using RF signalling |
Nov. 28, 2006 |
| 7135967 |
Method for locating an asset |
Nov. 14, 2006 |
| 7132940 |
Warning system and method for monitoring the availability of medical aids for a patient |
Nov. 7, 2006 |
| 7123143 |
Wireless signature management system |
Oct. 17, 2006 |
| 7123138 |
Home resource controller system |
Oct. 17, 2006 |
| 7119677 |
Personal monitoring system |
Oct. 10, 2006 |
| 7113089 |
Object locator standing alone or embedded in the existing device |
Sep. 26, 2006 |
| 7106191 |
Child distance monitoring and alerting system |
Sep. 12, 2006 |
| 7102511 |
Radio wave detection device |
Sep. 5, 2006 |
| 7095319 |
Method and apparatus for location search of portable device in wireless communications system |
Aug. 22, 2006 |
| 7088265 |
Systems and methods for proximity control of a barrier |
Aug. 8, 2006 |
| 7079025 |
Reconfigurable geolocation system |
Jul. 18, 2006 |
| 7064661 |
System for controlling and determining location and security model |
Jun. 20, 2006 |
| 7061385 |
Method and apparatus for a wireless tether system |
Jun. 13, 2006 |
| 7034690 |
Infant monitoring system and method |
Apr. 25, 2006 |
| 7023350 |
Personal protection device |
Apr. 4, 2006 |
| 7009522 |
Object-proximity monitoring and alarm system |
Mar. 7, 2006 |
| 6992584 |
Mobile device comprising a GPS receiver |
Jan. 31, 2006 |
| 6992581 |
Method and apparatus for attenuating of a broadcasting received signal for achieving a better distance resolution in monitoring systems |
Jan. 31, 2006 |
| 6975234 |
Surveillance and remote alarm system for persons subject to limitation of freedom of movement |
Dec. 13, 2005 |
| 6960996 |
Device for locating trapped victims and a method of operating such a device |
Nov. 1, 2005 |
| 6958707 |
Emergency vehicle alert system |
Oct. 25, 2005 |
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