US4774521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonant marker for use with radio frequency electronic article surveillance system
Assignee: 3M Co
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Filing: 1986-09-26
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Granted: 1988-09-27
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Expires: 2006-09-26
Abstract
Abstract A resonant marker for use with an RF electronic article surveillance system, said marker having a resonant circuit combining a flat coil with a condenser, adapted to be mounted on an article so as to be located by a goods monitoring apparatus by radio waves, characterized by setting a portion of said coil almost perpendicularly to the plane including the remainder of the coil.
Inventors
- 👤 Sadao Okada
- 👤 Kazunori Umezawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:26
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2402; G08B13/2405; G08B13/2414; G08B13/242; G08B13/2428; G08B13/2434; H; H10; H10D; H10D86/00; H10D86/80; H10D86/85
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A resonant marker adapted to be secured to an article and detected by a radio frequency electronic article surveillance (EAS) system, in which the marker includes a resonant inductive-capacitive circuit comprising a flat coil, characterized by a section of the coil being bent away from the plane of the main portion of said planar coil, thereby allowing the coil to be affixed to an edge of a substantially planar article having an extended piece which is conductive, such that the section of the coil out of the plane is also out of the plane of the conductive area.
Claim 2
Dependent Claim
98 words
A resonant marker adapted to be secured to an article and detected by a radio frequency electronic article surveillance (EAS) system, in which the marker includes a resonant inductive-capacitive circuit comprising a flat coil, characterized by a section of the coil being bent away from the plane of the main portion of said planar coil, thereby allowing the coil to be affixed to an edge of a substantially planar article having an extended piece which is conductive, such that the section of the coil out of the plane is also out of the plane of the conductive area.
References Cited (Backward Citations)
US4509039A
Cited
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 |