US4774504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
EAS tag with helical coil
Assignee: Sensormatic Electronics Corp
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Filing: 1987-06-22
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Granted: 1988-09-27
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Expires: 2007-06-22
Abstract
Abstract An anti-theft tag for use in an electronic article surveillance system has a housing, a lock for releasably attaching the housing to an article to be protected, and a marker on the housing, the marker having a resonant circuit including an inductor and a capacitor, the inductor including a solenoid type winding defining a winding opening, wherein the circuit has a Performance Factor P of at least 1×10 6 in the equation P=QA 1 .5, wherein Q is equal to the circuit Q, and wherein A is equal to the area of the winding opening in square millimeters.
Inventors
- 👤 Michael F. Hartings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:37
CPC Classifications
E; E05; E05B; E05B73/00; E05B73/0017; E05B73/0047; E05B73/0052
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
102 words
A tag for use in an electronic article surveillance system, the tag comprising: a housing, a detectable marker held by the housing, means for attaching the housing to an article to be protected, wherein the marker includes a resonant circuit including an inductor and a capacitor, wherein the inductor is comprised of a solenoid type winding defining a winding opening, wherein the circuit has a Performance Factor P of at least 1×10 6 in the equation P=QA 1 .5, wherein Q is equal to the circuit Q, and wherein A is equal to the area of the winding opening in square millimeters.
Claim 2
Dependent Claim
102 words
A tag for use in an electronic article surveillance system, the tag comprising: a housing, a detectable marker held by the housing, means for attaching the housing to an article to be protected, wherein the marker includes a resonant circuit including an inductor and a capacitor, wherein the inductor is comprised of a solenoid type winding defining a winding opening, wherein the circuit has a Performance Factor P of at least 1×10 6 in the equation P=QA 1 .5, wherein Q is equal to the circuit Q, and wherein A is equal to the area of the winding opening in square millimeters.
Claim 3
Dependent Claim
14 words
A tag as defined in claim 1, wherein the winding opening is generally square.
Claim 4
Dependent Claim
17 words
A tag as defined in claim 1, wherein the area A is at least 980 sq. millimeters.
Claim 5
Dependent Claim
22 words
A tag as defined in claim 1, wherein the attaching means includes a metal component and is disposed outside the winding opening.
Claim 6
Dependent Claim
16 words
A tag as defined in claim 4, wherein the winding has no more than two turns.
Claim 7
Dependent Claim
16 words
A tag as defined in claim 4, wherein the winding has no more than three turns.
Claim 8
Dependent Claim
25 words
A tag as defined in claim 1, wherein the winding is comprised of one piece of wire having a diameter of at least 0.16 millimeter.
Claim 9
Dependent Claim
26 words
A tag as defined in claim 1, wherein the winding is comprised of one piece of wire having a diameter of between 0.16 and 2.05 millimeters.
Claim 10
Dependent Claim
16 words
A tag as defined in claim 1, wherein the winding has no more than two turns.
Claim 11
Dependent Claim
16 words
A tag as defined in claim 1, wherein the winding has no more than three turns.
Claim 12
Dependent Claim
16 words
A tag as defined in claim 1, wherein the winding has no more than ten turns.
Claim 13
Dependent Claim
81 words
A tag for use in an electronic article surveillance system, the tag comprising: a housing, a detectable marker held by the housing, means for attaching the housing to an article to be protected, wherein the marker includes a resonant circuit including an inductor and a capacitor, wherein the inductor is comprised of a solenoid-type winding defining a winding opening, the winding having spaced terminal end portions extending into the opening, and the capacitor being electrically connected to the terminal end portions.
Claim 14
Dependent Claim
81 words
A tag for use in an electronic article surveillance system, the tag comprising: a housing, a detectable marker held by the housing, means for attaching the housing to an article to be protected, wherein the marker includes a resonant circuit including an inductor and a capacitor, wherein the inductor is comprised of a solenoid-type winding defining a winding opening, the winding having spaced terminal end portions extending into the opening, and the capacitor being electrically connected to the terminal end portions.
Claim 15
Dependent Claim
16 words
A tag as defined in claim 12, wherein the winding comprises no more than three turns.
Claim 16
Dependent Claim
15 words
A tag as defined in claim 12, wherein the winding comprises essentially two complete turns.
Claim 17
Dependent Claim
23 words
A tag as defined in claim 12, wherein the winding is comprised of wire having a diameter of between 0.16 and 2.05 millimeters.
Claim 18
Dependent Claim
20 words
A tag as defined in claim 12, wherein the opening has an area of between 980 and 7500 square millimeters.
Claim 19
Dependent Claim
19 words
A tag as defined in claim 12, wherein the opening has an area of at least 980 square millimeters.
Claim 20
Dependent Claim
20 words
A tag as defined in claim 12, wherein the opening has an area of between 980 and 2000 square millimeters.
Claim 21
Dependent Claim
17 words
A tag as defined in claim 12, wherein the circuit has a Q of at least 25.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |