Wash destructible resonant tag
First Claim
Patent Images
1. A resonant tag and carrier, the tag resonating with a radio wave at a predetermined frequency, the tag comprising:
- a polypropylene film having a thickness of approximately 8 μ
m or less;
a first circuit comprising a first metal foil including a coil portion and a plate portion, which comprises a first plate of a capacitor, formed on one side of said polypropylene film;
a second circuit made of a second metal foil including a plate section which comprises a second plate of said capacitor, formed on the other side of said polypropylene film;
a first paper layer adhered to said first circuit side;
a second paper layer adhered to said second circuit side; and
wherein said both circuits comprise an LC circuit by being electrically connected;
the carrier comprising a fluid-permeable fabric;
wherein the tag is enclosed in the carrier such that when the carrier and tag are immersed in water, said paper layers are saturated with said fluid.
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Accused Products
Abstract
A resonant tag for use with a radio-wave detection system for the prevention of shoplifting or the like, which has a coil and capacitor circuit formed on opposite sides of an extremely thin substrate of a biaxially-oriented polypropylene, with one of the capacitor plates formed on one side of the substrate and the coil and other capacitor plate formed on the other side of the substrate, and paper layers on both sides of the tag, whereby the circuit is destroyed when the tag is washed in water or dry cleaned.
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Citations
18 Claims
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1. A resonant tag and carrier, the tag resonating with a radio wave at a predetermined frequency, the tag comprising:
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a polypropylene film having a thickness of approximately 8 μ
m or less;a first circuit comprising a first metal foil including a coil portion and a plate portion, which comprises a first plate of a capacitor, formed on one side of said polypropylene film; a second circuit made of a second metal foil including a plate section which comprises a second plate of said capacitor, formed on the other side of said polypropylene film; a first paper layer adhered to said first circuit side; a second paper layer adhered to said second circuit side; and wherein said both circuits comprise an LC circuit by being electrically connected; the carrier comprising a fluid-permeable fabric; wherein the tag is enclosed in the carrier such that when the carrier and tag are immersed in water, said paper layers are saturated with said fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for deactivating a resonant tag that resonates with a radio wave at a predetermined frequency, comprising:
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forming the tag having; a polypropylene film having a thickness of approximately 8 μ
m or less;a first circuit comprising a first metal foil including a coil portion and a plate portion, which comprises a first plate of a capacitor, formed on one side of said polypropylene film; a second circuit made of a second metal foil including a plate section which comprises a second plate of said capacitor, formed on the other side of said polypropylene film; a first paper layer adhered to said first circuit side; a second paper layer adhered to said second circuit side; wherein said both circuits comprise an LC circuit by being electrically connected; and immersing said tag in a washing fluid in a washing cycle; saturating said paper sheets in said washing fluid; wherein said metal foil and film are distorted, rendering the tag deactivated. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for deactivating a resonant tag comprising,
forming a resonant tag having a polypropylene film having a thickness of approximately 8 μ - m or less, a metal foil layer and a one paper layer;
immersing said tag in a washing fluid in a washing cycle; saturating said paper layer in said washing fluid; wherein said metal foil is distorted, rendering the tag deactivated. - View Dependent Claims (18)
- m or less, a metal foil layer and a one paper layer;
Specification