| Impinj, Inc. Patent applications |
| Patent application number | Title | Published |
|---|
| 20100270382 | PACKAGED RFID IC WITH INTEGRATED ANTENNA - A precursor for a Radio Frequency Identification (RFID) tag includes a conductive lead frame with at least three segments, an RFID Integrated Circuit (IC) with at least two antenna terminals, and at least two jumpers. The RFID IC is mounted on at least one of the segments. The antenna terminals are electrically coupled to at least two of the segments, and the jumpers electrically couple the segments such that the coupled segments form a two-turn coil between the antenna terminals of the RFID IC. | 10-28-2010 |
| 20100182129 | INTERFERENCE REJECTION IN RFID TAGS - RFID tags, tag circuits, and methods are provided that reject at least in part the distortion caused to wireless signals by interference in the environment. When the received RF wave is converted into an unfiltered input ( | 07-22-2010 |
| 20090237220 | RFID TAGS WITH POWER RECTIFIERS THAT HAVE BIAS - A system and method for generating a rectified signal in a RFID tag. An alternating signal is received by the RFID tag, and a first phase of the alternating signal is coupled to a gate and to a first non-controlling terminal of a first switching transistor. The non-controlling terminal of the first switching transistor is one of a source and a drain of the first switching transistor. A first bias voltage is applied between the first non-controlling terminal and the gate of the first switching transistor and a rectified voltage is received between the first non-controlling terminal and a second non-controlling terminal of the first switching transistor. | 09-24-2009 |
| 20090002132 | CAUSING RFID TAG TO CHANGE HOW MANY REMAINING COMMANDS IT WILL COMPLY WITH - RFID reader systems, readers, components, software and methods for causing a custom RFID tag to change how many remaining commands they will comply with. In a number of embodiments, this is achieved by causing a custom limiting command to be transmitted to the tag. | 01-01-2009 |
| 20080266098 | RFID READERS CO-EXISTING WITH OTHER ISM-BAND DEVICES - Radio Frequency IDentification (RFID) reader system, software, and methods are provided, such that an operational processing block for the RFID reader to communicate with an RFID tag uses a RF spectrum portion subdivided into a set of channels. The communication takes place in the presence of a foreign device that uses a subset of first channels of the RF spectrum and does not use a subset of second channels of the spectrum. The methods cause a radiating power directed towards the tag to be reduced and a radiating dwell time to be changed. This is to assure that co-existing systems can operate without compromising their functionality and operational quality. In some embodiments, the radiating power is reduced to zero. | 10-30-2008 |
| 20080258916 | RFID TAG CHIPS AND TAGS REFRAINING FROM PARTICIPATING IN A SUBSEQUENT INVENTORYING ATTEMPT AND METHODS - RFID tags and chips for RFID tags are capable of being inventoried in one or more early attempts. These tags are capable of then refraining from participating in one or more subsequent inventorying attempts. In some embodiments refraining is performed solely by the tag, while in others it is guided by the RFID reader. In some embodiments, an inventoried indicator in the tag becomes updated upon backscattering. The updated value is used by the tag to recognize a subsequent attempt, and thus refrain from participating in it. This permits the subsequent attempt to be used more intensively for inventorying the more elusive, harder-to-read tags, especially in more demanding scenarios. | 10-23-2008 |
| 20080258878 | FACILITATING RFID TAGS TO REFRAIN FROM PARTICIPATING IN A SUBSEQUENT INVENTORYING ATTEMPT - RFID reader systems, readers, components, software and methods can inventory RFID tags in one or more early attempts. Then they can facilitate the inventoried RFID tags to refrain from participating in one or more subsequent inventorying attempts. In some embodiments, an inventoried indicator in the tag becomes updated upon backscattering. The updated value is used by the tag to recognize a subsequent attempt, and thus refrain from participating in it. This permits the subsequent attempt to be used more intensively for inventorying the more elusive, harder-to-read tags, especially in more demanding scenarios. | 10-23-2008 |
| 20080205150 | HYBRID NON-VOLATILE MEMORY - A non-volatile memory (NVM) circuit includes at least two types of NVM sub-circuits that share common support circuitry. Different types of NVM sub-circuits include ordinary NVM circuits that provide a logic output upon being addressed, programmable fuses that provide an output upon transitioning to a power-on state, NVM circuits that provide an ON/OFF state output, and the like. Some of the outputs are used to calibrate circuits within a device following power-on. Other outputs are used to store information to be employed by various circuits. | 08-28-2008 |
| 20080204195 | RFID TAG CHIPS AND TAGS COMPLYING WITH ONLY A LIMITED NUMBER OF REMAINING COMMANDS AND METHODS - RFID tags and chips for RFID tags are capable of complying with only a limited number of remaining commands, and methods. In a number of embodiments, a counter is adjusted in association with receiving a command and complying with it. The tag complies until the counter reaches a limit, and then it can stop complying. Non-compliance can be by the tag becoming quiet, or performing other activities, or performing nothing at all, or performing only selected activities, and so on. In some embodiments non-compliance is permanent, while in others it is temporary and/or restorable. | 08-28-2008 |
| 20080197979 | CAUSING RFID TAGS TO REPLY USING CHANGED REPLY TIMING - RFID reader systems, readers, components, software and methods cause RFID tags to reply using changed reply timing. In a number of embodiments, this timing change is achieved by causing a custom timing command to be transmitted to a tag. In some embodiments, the changed reply timing affects an amount of delay before a tag backscatters a reply. | 08-21-2008 |
| 20080197978 | RFID TAGS REPLYING USING CHANGED REPLY TIMING - RFID tags and chips for RFID tags are capable of replying using changed reply timing. In a number of embodiments, this timing change is achieved when a tag receives a custom timing command from an RFID reader. In some embodiments, the changed reply timing affects an amount of delay before a tag backscatters a reply. | 08-21-2008 |
