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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:
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Patent Number Title Of Patent Date Issued
8710978 Method and apparatus for communication Apr. 29, 2014
8704657 Method for reminding objects being away and communication device and computer readable medium using the same method Apr. 22, 2014
8674828 Real time location system and method for caching location information based on finger printing Mar. 18, 2014
8669846 Wireless devices for process automation and verification Mar. 11, 2014
8643486 Portable alarm device Feb. 4, 2014
8643490 Multi-mode RFID tag architecture Feb. 4, 2014
8633817 Mapping wireless signals with motion sensors Jan. 21, 2014
8633814 Methods and systems for alerting persons of obstacles or approaching hazards Jan. 21, 2014
8604911 Signal power mapping for detection of buried objects and other changes to the RF environment Dec. 10, 2013
8581707 Methods and apparatus for identifying and categorizing distributed devices Nov. 12, 2013
8525672 Passive entry and/or passive go system and associated operating method Sep. 3, 2013
8525684 Method and system for locating and communicating with a user of a wireless communication device Sep. 3, 2013
RE44433 Method and apparatus for a wireless tether system Aug. 13, 2013
8508167 Actuation device Aug. 13, 2013
8487767 Information access system, information device, reader/writer and recording medium Jul. 16, 2013
8461978 Wireless ultrasound probe asset tracking Jun. 11, 2013
8451115 System and method for preventing portable terminal from being left, and portable terminal May. 28, 2013
8451118 Method and apparatus for maintaining and locating lost, misplaced or stolen articles May. 28, 2013
8446277 Proximity warning system with silent zones May. 21, 2013
8446254 Methods and apparatuses for RFID tag range determination May. 21, 2013
8432285 Multi-mode RFID tag architecture Apr. 30, 2013
8427289 Low latency inside/outside determination for portable transmitter Apr. 23, 2013
8373562 Asset tracking system Feb. 12, 2013
8362896 Methods and systems for alerting persons of obstacles or approaching hazards Jan. 29, 2013
8339243 System and method for positioning active RFID tag Dec. 25, 2012
8335470 Communication apparatus and method for controlling the same Dec. 18, 2012
8330623 Method and apparatus for recognizing parking area Dec. 11, 2012
RE43809 Personal item reminder Nov. 20, 2012
8306526 Wireless communication area measuring apparatus and computer program of the same Nov. 6, 2012
8299928 Systems and methods for providing viewer-related information on a display based upon wireless identification of a particular viewer Oct. 30, 2012
8274382 Compass based car locator Sep. 25, 2012
8269607 Proximity location system and method thereof for locating a communications device Sep. 18, 2012
8258931 Method of positioning sensors for twinned wheels of a vehicle Sep. 4, 2012
8237566 Multi-mode RFID tag architecture Aug. 7, 2012
8199004 RFID tag reader Jun. 12, 2012
8200273 Binding wireless devices in a building automation system Jun. 12, 2012
8188892 Moving vehicle system and method of detecting position of moving vehicle May. 29, 2012
8183999 Emergency locating system and method using spread-spectrum transceiver May. 22, 2012
8179253 Location and tracking system, method and device using wireless technology May. 15, 2012
8179252 Tornado alarm system May. 15, 2012
8169319 Virtual group maintenance and security May. 1, 2012
8169328 Proximity monitoring and locating system May. 1, 2012
8164444 Position detection Apr. 24, 2012
8164445 Cableless operation of a medical device Apr. 24, 2012
8159342 Systems and methods for wireless object tracking Apr. 17, 2012
8144017 Transponder and method for operating a transponder Mar. 27, 2012
8138915 Systems and methods for rendering alert information for digital radio broadcast, and active digital radio broadcast receiver Mar. 20, 2012
8138911 Personal locator beacon Mar. 20, 2012
8130116 Mobile telephone tracking system Mar. 6, 2012
8106767 Wireless tag communication system and image forming apparatus Jan. 31, 2012

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