Patent US5496611A successfully refreshed from Google Patents.
US5496611A
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Antitheft label for use on objects and an absorptive pad having such an antitheft label for use on food
Assignee: Unitika Ltd
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Filing: 1994-01-26
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Granted: 1996-03-05
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Expires: 2014-01-26
Abstract
Abstract An antitheft label composed of a soft magnetic metal strip permanently applied to an electroconductive nonmagnetic metal member. The label is attached to an object to prevent the object from being stolen or taken without permission. An object, such as food goods, having such an antitheft label can be thawed or heated in a high-frequency heater such as a microwave oven without developing spark discharge at edges of the soft magnetic metal strip of the label, thereby preventing the occurrence of fire damage to the food product.
Inventors
- 👤 Takashi Ikeda
- 👤 Akira Homma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:38
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2402; G08B13/2405; G08B13/2408; G08B13/2428; G08B13/2434; G08B13/2437; G08B13/2442; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/12; Y10T428/12382; Y10T428/12465; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12757; Y10T428/24; Y10T428/24752; Y10T428/24777; Y10T428/26; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
74 words
An antitheft label comprising an electroconductive nonmagnetic metal member permanently applied to a magnetic metal strip, wherein said electroconductive nonmagnetic metal member is shaped so as to include a plurality of corners, each of said corners of said electroconductive nonmagnetic metal member having a radius of curvature which is greater than or equal to 0.3 mm, wherein edges of said magnetic metal strip do not extend beyond edges of said electroconductive nonmagnetic metal member.
Claim 2
Dependent Claim
74 words
An antitheft label comprising an electroconductive nonmagnetic metal member permanently applied to a magnetic metal strip, wherein said electroconductive nonmagnetic metal member is shaped so as to include a plurality of corners, each of said corners of said electroconductive nonmagnetic metal member having a radius of curvature which is greater than or equal to 0.3 mm, wherein edges of said magnetic metal strip do not extend beyond edges of said electroconductive nonmagnetic metal member.
Claim 3
Dependent Claim
32 words
An antitheft label according to claim 1, wherein said electroconductive nonmagnetic metal member is shaped so that each of said corners has a radius of curvature between 0.5 mm and 10 mm.
Claim 4
Dependent Claim
21 words
An antitheft label according to claim 2, wherein said corners have a radius of curvature between 1 mm and 5 mm.
Claim 5
Dependent Claim
21 words
An antitheft label according to claim 1, wherein said electroconductive nonmagnetic metal member has an aspect ratio of 1:1 to 1:30.
Claim 6
Dependent Claim
16 words
An antitheft label according to claim 4, wherein said aspect ratio ranges from 1:1 to 1:15.
Claim 7
Dependent Claim
36 words
An antitheft label according to claim 1, wherein said electroconductive nonmagnetic metal member is selected from the group consisting of a metal foil, a metal sheet, and a metal film laminated on a synthetic resin film.
Claim 8
Dependent Claim
22 words
An antitheft label according to claim 1, wherein said electroconductive nonmagnetic metal member ranges from 5 μm to 200 μm in thickness.
Claim 9
Dependent Claim
22 words
An antitheft label according to claim 7, wherein said electroconductive nonmagnetic metal member ranges from 7 μm to 50 μm in thickness.
Claim 10
Dependent Claim
23 words
An antitheft label according to claim 1, wherein said magnetic metal strip is selected from the group consisting of amorphous metals and permalloys.
Claim 11
Dependent Claim
28 words
An antitheft label according to claim 9, wherein said magnetic metal strip comprises ferromagnetic amorphous metals which have permeabilities of greater than or equal to 10 4 .
Claim 12
Dependent Claim
27 words
An antitheft label according to claim 9, wherein said magnetic metal strip comprises ferromagnetic amorphous metals which generate higher-order harmonics in response to an incident magnetic field.
References Cited (Backward Citations)
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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) | 1999-03-05 | 1999-09-04 | 2000-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-05 | 2003-09-04 | 2004-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-05 | 2007-09-04 | 2008-03-05 | $7700.00 | Window Closed / Lapsed |