Patent ID: 6806808
Filing Date: 2004-10-19
Classification: G01D,G01K

Abstract:
A device for recording a plurality of distinct physical or chemical events or states, the device comprising:a combination sensor and recording device, said combination sensor and recording device comprising: a sensor for detecting the plurality of physical or chemical events or states wherein the sensor is capable of passively sensing each of the events; a recording mechanism, including the sensor, capable of storing records of the plurality of physical or chemical events or states that have been detected by the sensor without using energy received from an interrogator wherein each of the records corresponds to one of the physical or chemical events detected by the sensor and wherein each record is stored using power derived from thermal energy or chemical energy inherently present in an environment where the device is placed and wherein the chemical energy is provided from a chemical reaction between a chemical constituent in the environment and a component of the recording mechanism designed to react with the chemical constituent; a tag that contains identification information that can distinguish said device from a plurality of devices; a transponder, coupled to the combination sensor and recording device and the tag, configured to transmit a signal indicating one or more of the physical or chemical events or states stored on the recording mechanism and the identification information when triggered by a wireless interrogation signal.