Rfid spoilage sensor for packaged food and drugs
OwnerMaria Smolander, Heikki Seppa +6inventors
InventorsMaria Smolander, Heikki Seppa, Eero Hurme, Timo Varpuna, Juha-Maiti Saari, Ilkka Suni, Jorma Sammi, Pani Majander
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Abstract
The present invention relates to a remotely readable sensor (22) for indication of usability condition of perishable products such as foodstuffs and medical drugs. The sensor incorporates an element responsive to the condition of the perishable product. According to the invention, the sensor (22) is placed inside the foodstuff package.
Claims32
A remotely by RF techniques readable sensor (22) for indication of usability condition of perishable products such as foodstuffs and medical drugs, comprising
- a sensor circuit (22) of a resonant LC circuit type incorporating
- an element (12) responsive to the condition of said perishable product such that
- the properties of said element change in a cumulative fashion as a function of a selected measurement variable,
- characterized in that
- said element (12) is such in which its electrical properties change cumulatively as a direct function of the degree of product spoilage either due to a reaction related to product spoilage or under the effect of oxygen or other undesirable gas or liquid.
A method of indicating usability condition of perishable products such as foodstuffs and medical drugs, in which method a sensor (22) remotely readable by RF techniques and capable of indicating the product condition is used for condition indication,
- characterized in that
- a sensor (22) is placed inside a foodstuff package.
A system for indicating usability condition of perishable products such as foodstuffs and medical drugs, the system incorporating a sensor (22) capable of indicating the product condition is used for condition indication,
- said sensor (22) is a resonant LC circuit with cumulative indicator properties and adapted remotely readable by RF techniques, and
- said system further includes an apparatus (12) for remote read of the properties of said sensor (22) using RF techniques,
- characterized in that
- said sensor (22) is placed inside a foodstuff package.
Use of RF-type sensor (22) inside a foodstuff or medical drug package for direct indication of spoilage or ambient oxygen content.
Dependencies are inferred from the claim text.