Resonant tag with a conductive composition closing an electrical circuit
First Claim
Patent Images
1. A tag comprising:
- a dielectric substrate having first and second opposite principal surfaces;
an electrical circuit comprising an electrically conductive pattern formed on at least one of the principal surfaces of the dielectric substrate, wherein the conductive pattern includes a gap which establishes an electrical open circuit; and
an electrically conductive composition including electro-conductive particles bridging the gap in the conductive pattern to temporarily establish an electrical closed circuit wherein the electrical circuit resonates when exposed to electromagnetic energy at a frequency within a predetermined frequency range wherein the electro-conductive particles are dispersed in a polymeric matrix material.
6 Assignments
0 Petitions
Accused Products
Abstract
Briefly stated a tag includes a dielectric substrate having first and second opposite principal surfaces. An electrical circuit having an electrically conductive pattern is formed on at least one of the principal surfaces of the dielectric substrate, the conductive pattern including a gap which establishes an electrical open circuit. An electrically conductive composition including electro-conductive particles is provided for bridging the gap in the conductive pattern to temporarily establish an electrical closed circuit which resonates when exposed to electromagnetic energy at a frequency within a predetermined frequency range.
84 Citations
30 Claims
-
1. A tag comprising:
-
a dielectric substrate having first and second opposite principal surfaces; an electrical circuit comprising an electrically conductive pattern formed on at least one of the principal surfaces of the dielectric substrate, wherein the conductive pattern includes a gap which establishes an electrical open circuit; and an electrically conductive composition including electro-conductive particles bridging the gap in the conductive pattern to temporarily establish an electrical closed circuit wherein the electrical circuit resonates when exposed to electromagnetic energy at a frequency within a predetermined frequency range wherein the electro-conductive particles are dispersed in a polymeric matrix material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method of making a tag comprising the steps of:
-
forming an electrical circuit on a dielectric substrate, the circuit comprising at least one electrically conductive pattern; forming a gap in the conductive pattern to establish an open circuit; applying a liquid composition to the conductive pattern to bridge the gap, the liquid composition including electro-conductive particles dispersed in one of a polymeric matrix material and a water based dispersion; and drying the liquid composition to form an electrically conductive composition in the conductive pattern to cause the electrical circuit to resonate when exposed to electromagnetic energy at a frequency within a predetermined frequency range. - View Dependent Claims (12, 13, 14, 15)
-
-
16. A method for deactivating a tag, comprising the steps of:
-
forming an electrical circuit on a dielectric substrate, the circuit comprising at least one electrically conductive pattern; forming a gap in the conductive pattern to establish an open circuit; applying a liquid composition to the conductive pattern to bridge the gap; drying the liquid composition to form an electrically conductive composition in the conductive pattern to cause the electrical circuit to resonate when exposed to electromagnetic energy at a frequency within a predetermined frequency range; and reestablishing the gap in the conductive pattern by exposing at least a portion of the conductive composition to a fluid for a predetermined time to cause at least a portion of the conductive composition to partially dissipate resulting in an electrical open circuit condition in the electrical circuit to prevent the electrical circuit from resonating within the predetermined frequency range.
-
-
17. A tag comprising:
-
a dielectric substrate having first and second opposite principal surfaces; an electrical circuit comprising an electrically conductive pattern formed on at least one of the principal surfaces of the dielectric substrate, the conductive pattern including a gap which establishes an electrical open circuit in the electrical circuit; and an electrically conductive composition bridging the gap in the conductive pattern which temporarily establishes an electrical closed circuit in the electrical circuit such that the electrical circuit resonates when exposed to electromagnetic energy at a frequency within a predetermined frequency range, the composition being such that exposing the composition to a fluid for a predetermined time causes at least a portion of the composition to at least partially dissipate resulting in an electrical open circuit condition in the electrical circuit which prevents the electrical circuit from resonating within the predetermined frequency range. - View Dependent Claims (18)
-
-
19. A tag comprising:
-
a dielectric substrate having first and second opposite principal surfaces; an electrical circuit comprising an electrically conductive pattern formed on at least one of the principal surfaces of the dielectric substrate, wherein the conductive pattern includes a gap which establishes an electrical open circuit; and an electrically conductive composition including electro-conductive particles bridging the gap in the conductive pattern to temporarily establish an electrical closed circuit wherein the electrical circuit resonates when exposed to electromagnetic energy at a frequency within a predetermined frequency range wherein exposing the tag to a mechanical force for a predetermined time causes at least a portion of the composition to at least partially dissipate resulting in an electrical open circuit condition in the electrical circuit which prevents the electrical circuit from resonating within the predetermined frequency range. - View Dependent Claims (20, 21)
-
-
22. A method for deactivating a tag, comprising the steps of:
-
forming an electrical circuit on a dielectric substrate, the circuit comprising at least one electrically conductive pattern; forming a gap in the conductive pattern to establish an open circuit; applying a liquid composition to the conductive pattern to bridge the gap; drying the liquid composition to form an electrically conductive composition in the conductive pattern to cause the electrical circuit to resonate when exposed to electromagnetic energy at a frequency within a predetermined frequency range; and reestablishing the gap by exposing the tag to a mechanical force for a predetermined time to cause at least a portion of the conductive composition to at least partially dissipate resulting in an electrical open circuit condition in the electrical circuit to prevent the electrical circuit from resonating within the predetermined frequency range. - View Dependent Claims (23)
-
-
24. A tag comprising:
-
a dielectric substrate having first and second opposite principal surfaces; an electrical circuit comprising an electrically conductive pattern formed on at least one of the principal surfaces of the dielectric substrate, wherein the conductive pattern includes a gap which establishes an electrical open circuit; and an electrically conductive composition including electro-conductive particles dispersed in a water based dispersion bridging the gap in the conductive pattern to temporarily establish an electrical closed circuit whereby the electrical circuit resonates when exposed to electromagnetic energy at a frequency within a predetermined frequency range. - View Dependent Claims (25, 26, 27, 28, 29)
-
-
30. A tag comprising:
-
a dielectric substrate having first and second opposite principal surfaces; an electrical circuit comprising an electrically conductive pattern formed on at least one of the principal surfaces of the dielectric substrate, wherein the conductive pattern includes a gap which establishes an electrical open circuit; and an electrically conductive composition including electro-conductive particles bridging the gap in the conductive pattern to temporarily establish an electrical closed circuit therein, the electrical circuit resonating when exposed to electromagnetic energy at a frequency within a predetermined frequency range, wherein exposing the conductive composition to a mechanical force for a predetermined time causes at least a portion of the composition to at least partially dissipate resulting in an electrical open circuit condition in the electrical circuit which prevents the electrical circuit from resonating within the predetermined frequency range, and exposing the conductive composition to at least one of water and a dry cleaning solution for a predetermined time does not cause the conductive pattern to dissipate.
-
Specification