| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 340572200 | Specified relationship between field and detection frequencies (e.g., nth order harmonics) | 6 |
| 20080231454 | Cargo Container Monitoring Device - According to one embodiment, a cargo container monitoring system includes components located on a cargo ship for collecting cargo container status information for a plurality of cargo containers. The components include at least one combination data logger and gateway device. The combination device includes a first antenna and a second antenna. The first antenna is configured to receive first wireless communications signals transmitted by a plurality of tags at a first frequency. Each tag is associated with a particular one of the cargo containers and the first wireless communications signals received from each tag include cargo container status information for the associated cargo container. The second antenna is configured to transmit second wireless communications signals to an access point at a second frequency. The second wireless communications signals include the cargo container status information received from the plurality of tags and the first frequency is different from the second frequency. | 09-25-2008 |
| 20080238679 | MULTI-MODE RFID TAG ARCHITECTURE - A multi-mode RFID tag includes a power generating and signal detection module, a baseband processing module, a transmit section, a configurable coupling circuit, and an antenna section. In near field mode, the configurable coupling circuit is operable to couple the transmit section to a coil or inductor in the configurable coupling circuit to transmit an outbound transmit signal using electromagnetic or inductive coupling to an RFID reader. In far field mode, the configurable coupling circuit is operable to couple the transmit section to the antenna section, and the multi-mode RFID tag then utilizes a back-scattering RF technology to transmit the outbound transmit signal to RFID readers. | 10-02-2008 |
| 20090045958 | SYSTEM AND METHOD FOR LOCATING PERSONAL ITEMS AND THE LIKE - The invention is a system for locating and preventing the loss of personal items within a geographic zone. The system components are a personal portable homing center device a having a radio frequency receiver and a transducer that is actuated by a change in a signal strength; and several zone devices, for instance an active RFID tag attached to the personal item. The homing center device has an algorithm to measure the strength of the signal generated by the tag. The transducer is an audible and/or a silent alarm. The homing center device has three operating modes: Off, Homing-in, and Homing-out. In the Homing-in mode the alarm is actuated when a zone device's signal is detected. In the Homing-out operating mode the alarm is actuated when a zone device's signal falls to a threshold strength, indicating that the item is no longer close to the homing center device. | 02-19-2009 |
| 20090102662 | DEVICE AND PROCESS FOR MAGNETIC MATERIAL DETECTION IN ELECTRONIC ARTICLE SURVEILLANCE (EAS) ELECTROMAGNETIC SYSTEMS - The present invention relates to a device with its related electronic circuit and to a detection process, targeted to detect any magnetic material moving around the antennas/sensors ( | 04-23-2009 |
| 20090261976 | PHASE COUPLER FOR ROTATING FIELDS - This invention relates to dynamically controlled, electronic article surveillance (EAS) systems whereby an array of antenna elements is digitally phased and actively driven for concurrent transmission, and digitally phased and combined in the receiver unit to improve detection. In particular, the individual frequency and phase of the plurality of the transmit/receive signals are rapidly varied to allow for automated manipulation (steering) of the transmit field pattern and receive field sensitivity. The invention achieves the following features via means of digital phasing and dynamic computer control: sufficient far-field cancellation, null-free detection and uncompromised detection performance regardless of tag's orientation while using single transmission drivers to drive entire antenna structures, whether loop antenna or ferrite core antenna, using a phase coupler, thereby allowing more efficient system operation or additional features such as deactivator antenna operation. | 10-22-2009 |
| 20090278688 | RFID Devices Using RFID Circuits and Antennas Having Unmatched Frequency Ranges - An RFID system in which RFID devices utilize RFID circuits and antennas having unmatched frequency ranges. The system includes an RFID interrogator having multiple interrogator antennas. Each interrogator antenna can be tuned to different respective frequency ranges. The system includes an RFID device having an RFID circuit, and device antennas coupled to the RFID circuit. Each device antenna can be tuned to a respective frequency range that matches only one of the interrogator antennas for communicating with the RFID interrogator according to respective protocols associated with each respective frequency range. | 11-12-2009 |
