US5729201A
Expired / Lapsed
US
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Identification tags using amorphous wire
Assignee: Intermec IP Corp
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Filing: 1995-06-29
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Granted: 1998-03-17
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Expires: 2015-06-29
Abstract
Abstract An inexpensive multibit magnetic tag is described which uses an array of amorphous wires in conjunction with a magnetic bias field. The tag is interrogated by the use of a ramped field or an ac field or a combination of the two. The magnetic bias is supplied either by coating each wire with a hard magnetic material which is magnetized or by using magnetized hard magnetic wires or foil strips in proximity to the amorphous wires. Each wire switches at a different value of the external interrogation field due to the difference in the magnetic bias field acting on each wire.
Inventors
- 👤 Christopher Jahnes
- 👤 Richard Joseph Gambino
- 👤 Milan Paunovic
- 👤 Alejandro Gabriel Schrott
- 👤 Robert Jacob von Gutfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:52
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2402; G08B13/2405; G08B13/2408; G06; G06K; G06K19/00; G06K19/06; G06K19/06187; G06K19/067; G08B13/2414; G08B13/2417; G08B13/2428; G08B13/2437; G08B13/2442
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
A multibit identification tag comprising: a plurality of magnetic structures, and one or more bias structures; each of said magnetic structures being of amorphous metal in the shape of a wire, each of said magnetic structures having the same value of coercive force and wherein each of said plurality of magnetic structures produces a discontinuous change in magnetization at a different value of an externally applied magnetic field.
Claim 2
Dependent Claim
68 words
A multibit identification tag comprising: a plurality of magnetic structures, and one or more bias structures; each of said magnetic structures being of amorphous metal in the shape of a wire, each of said magnetic structures having the same value of coercive force and wherein each of said plurality of magnetic structures produces a discontinuous change in magnetization at a different value of an externally applied magnetic field.
Claim 3
Dependent Claim
28 words
A tag according to claim 1, wherein said bias structures are coatings of a hard magnetic material of different thickness on one or more of said magnetic structures.
Claim 4
Dependent Claim
18 words
A tag according to claim 1 wherein said one or more bias structures is in a remanent state.
Claim 5
Dependent Claim
20 words
A tag according to claim 1 wherein said one or more bias structures are in the form of a wire.
Claim 6
Dependent Claim
22 words
A tag according to claim 1 wherein more than two bias structures are present and said bias structures are of different lengths.
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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) | 2001-03-16 | 2001-09-15 | 2002-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-16 | 2005-09-15 | 2006-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-16 | 2009-09-15 | 2010-03-17 | $7700.00 | Window Closed / Lapsed |