Patent US5554974A successfully refreshed from Google Patents.
US5554974A
Expired / Lapsed
US
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Encodable tag with radio frequency readout
Assignee: Intermec IP Corp
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Filing: 1994-11-23
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Granted: 1996-09-10
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Expires: 2014-11-23
Abstract
Abstract A programmable tag for being readable remotely and in a manner which does not require that the tag be held in a particular orientation, includes a first layer of material with electron spin resonance absorption, a second layer of hard magnetic material, and a third layer of soft permeable magnetic material. The second layer and third layer are in close proximity to the first layer. The second layer and the third layer impose a magnetic bias field on the first layer.
Inventors
- 👤 Michael J. Brady
- 👤 Praveen Chaudhari
- 👤 Richard J. Gambino
- 👤 Harley K. Heinrich
- 👤 Paul A. Moskowitz
- 👤 Robert J. VON Gutfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:18
CPC Classifications
G; G06; G06K; G06K19/00; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2402; G08B13/2405; G08B13/2408; G06K19/06; G06K19/06187; G06K19/067; G08B13/2414; G08B13/2417; G08B13/2428; G08B13/2437; G08B13/2442; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12465; Y10T428/12493
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
137 words
A programmable tag, comprising: a first layer of magnetic material, a second layer of magnetic material, and a layer of resonant material, said resonant material having an electron spin resonance absorption characteristic, wherein one of said first layer and said second layer comprises a hard magnetic material and the other of said first layer and said second layer comprises a soft magnetic material, said first layer and said second layer being in close proximity to said layer of resonant material, and said first layer and said second layer imposing a magnetic bias field on said layer of resonant material, said magnetic bias field being selectively altered to thereby program said tag, wherein said soft magnetic layer provides an alterable magnetic shunt for personalizing said bias field applied thereto at individual portions of said layer of resonant material.
Claim 2
Dependent Claim
137 words
A programmable tag, comprising: a first layer of magnetic material, a second layer of magnetic material, and a layer of resonant material, said resonant material having an electron spin resonance absorption characteristic, wherein one of said first layer and said second layer comprises a hard magnetic material and the other of said first layer and said second layer comprises a soft magnetic material, said first layer and said second layer being in close proximity to said layer of resonant material, and said first layer and said second layer imposing a magnetic bias field on said layer of resonant material, said magnetic bias field being selectively altered to thereby program said tag, wherein said soft magnetic layer provides an alterable magnetic shunt for personalizing said bias field applied thereto at individual portions of said layer of resonant material.
Claim 3
Dependent Claim
17 words
A programmable tag according to claim 1, wherein said layer of resonant material includes 1,1 diphenyl-2-picrylhydrazyl hydrate.
Claim 4
Dependent Claim
34 words
A programmable tag according to claim 1, wherein said hard magnetic layer comprises one of Co-Pt-Ta and Fe-Zr-RE, where RE is a non-s-state rare earth element including one of Tb, Dy, Ho and Er.
Claim 5
Dependent Claim
21 words
A programmable tag according to claim 1, wherein said soft magnetic layer comprises one of an alloy of Ni-Co-B-Si and Co-Zr.
Claim 6
Dependent Claim
47 words
A programmable tag according to claim 1, wherein said magnetic bias field imposed on said layer of resonant material is substantially uniform within the volume of said layer of resonant material and the strength of said magnetic bias field is selectively altered, thereby to program said tag.
Claim 7
Dependent Claim
20 words
A programmable tag according to claim 1, wherein portions of said layer of resonant material have different magnetic bias fields.
Claim 8
Dependent Claim
158 words
A programmable tag, comprising: a first layer of magnetic material, a second layer of magnetic material, a layer of resonant material, said resonant material having an electron spin resonance absorption characteristic, wherein one of said first layer and said second layer comprises a hard magnetic material and the other of said first layer and said second layer comprises a soft magnetic material, said first layer and said second layer being in close proximity to said layer of resonant material, and said first layer and said second layer imposing a magnetic bias field on said layer of resonant material, said magnetic bias field being selectively altered to thereby program said tag, and further comprising a thermal barrier layer formed between said layer of soft magnetic material and the immediately adjacent layer or layers. wherein said soft magnetic layer provides an alterable magnetic shunt for personalizing said bias field applied thereto at individual portions of said layer of resonant material.
Claim 9
Dependent Claim
158 words
A programmable tag, comprising: a first layer of magnetic material, a second layer of magnetic material, a layer of resonant material, said resonant material having an electron spin resonance absorption characteristic, wherein one of said first layer and said second layer comprises a hard magnetic material and the other of said first layer and said second layer comprises a soft magnetic material, said first layer and said second layer being in close proximity to said layer of resonant material, and said first layer and said second layer imposing a magnetic bias field on said layer of resonant material, said magnetic bias field being selectively altered to thereby program said tag, and further comprising a thermal barrier layer formed between said layer of soft magnetic material and the immediately adjacent layer or layers. wherein said soft magnetic layer provides an alterable magnetic shunt for personalizing said bias field applied thereto at individual portions of said layer of resonant material.
Claim 10
Dependent Claim
24 words
A programmable multibit tag comprising a plurality of claim 1, 6 or 7 tags wherein each of said tags has a selected bias field.
Claim 11
Dependent Claim
56 words
A method of reading an encoded tag, said encoded tag comprising one or more claim 1, 6, or 7 tags, said method comprising the steps of: providing a radio frequency (RF) field around said encoded tag; and measuring an absorption of said RF field while simultaneously exposing said encoded tag to a time varying magnetic field.
Claim 12
Dependent Claim
29 words
A personalized multibit tag comprising a plurality of claim 1, 6 or 7 tags, wherein each of said tags is vertically stacked and each tag has a distinct code.
Claim 13
Dependent Claim
30 words
A programmable tag according to claim 7, wherein said thermal barrier layer is formed of one of Ge, a polymeric material, a polyester, Al 2 O 3 or amorphous silicon.
Claim 14
Dependent Claim
50 words
A programmable multibit tag comprising the tag of claim 1, 6 or 7 wherein said programmable multibit tag is subdivided into two or more regions having a boundary between regions, wherein altered regions are substantially non-magnetic and the unaltered regions are magnetic, and each region has a selected bias field.
Claim 15
Dependent Claim
14 words
The tag of claim 12 wherein said boundary comprises unaltered material of said tag.
Claim 16
Dependent Claim
14 words
The tag of claim 12 wherein said boundary comprises altered material of said tag.
Claim 17
Dependent Claim
36 words
The tag of claim 12 wherein said boundary is formed by the side by side stacking of individual said claims 1, 6 or 7 tags and said boundary comprises the edges of adjacent said individual tags.
Claim 18
Dependent Claim
69 words
A system for reading a programmable tag, said programmable tag including one or more claim 1, 6, or 7 tags, said system comprising: means for providing a radio frequency (RF) field around said programmable tag; means for providing a time varying magnetic field; and means for measuring an absorption of said RF field around said programmable tag while simultaneously exposing said programmable tag to said time varying magnetic field.
Claim 19
Dependent Claim
76 words
A system according to claim 16, further comprising an electronic device for receiving an output from said means for measuring and for decoding said output in terms of voltage changes as a function of said time varying magnetic field to establish a code for comparison with a predetermined code, wherein said means for providing said time varying magnetic field includes at least one of a coil carrying an alternating current (AC) and a direct current magnet.
Claim 20
Dependent Claim
149 words
A programmable tag, comprising: a first layer of magnetic material, a second layer of magnetic material, and a layer of resonant material, said resonant material having an electron spin resonance absorption characteristic, wherein one of said first layer and said second layer comprises a hard magnetic material and the other of said first layer and said second layer comprises a soft magnetic material, said first layer and said second layer being in close proximity to said layer of resonant material, and said first layer and said second layer imposing a magnetic bias field on said layer of resonant material, said magnetic bias field being selectively altered to thereby program said tag, wherein said soft magnetic layer provides an alterable magnetic shunt for selectively shunting a portion of said magnetic bias field to achieve personalization of said bias field applied thereto at individual portions of said layer of resonant material.
Claim 21
Dependent Claim
149 words
A programmable tag, comprising: a first layer of magnetic material, a second layer of magnetic material, and a layer of resonant material, said resonant material having an electron spin resonance absorption characteristic, wherein one of said first layer and said second layer comprises a hard magnetic material and the other of said first layer and said second layer comprises a soft magnetic material, said first layer and said second layer being in close proximity to said layer of resonant material, and said first layer and said second layer imposing a magnetic bias field on said layer of resonant material, said magnetic bias field being selectively altered to thereby program said tag, wherein said soft magnetic layer provides an alterable magnetic shunt for selectively shunting a portion of said magnetic bias field to achieve personalization of said bias field applied thereto at individual portions of said layer of resonant material.
Claim 22
Dependent Claim
152 words
A programmable tag, comprising: a first layer of magnetic material, a second layer of magnetic material, and a layer of resonant material, said resonant material having an electron spin resonance absorption characteristic, wherein one of said first layer and said second layer comprises a hard magnetic material and the other of said first layer and said second layer comprises a soft magnetic material, said first layer and said second layer being in close proximity to said layer of resonant material, and said first layer and said second layer imposing a magnetic bias field on said layer of resonant material, said magnetic bias field being selectively altered to thereby program said tag, wherein said soft magnetic layer has a fixed, predetermined thickness, and a plurality of non-magnetic breaks therein for selectively modifying the permeability of said soft magnetic layer, said non-magnetic breaks selectively increasing the flux carrying capacity of said soft magnetic layer.
Claim 23
Dependent Claim
152 words
A programmable tag, comprising: a first layer of magnetic material, a second layer of magnetic material, and a layer of resonant material, said resonant material having an electron spin resonance absorption characteristic, wherein one of said first layer and said second layer comprises a hard magnetic material and the other of said first layer and said second layer comprises a soft magnetic material, said first layer and said second layer being in close proximity to said layer of resonant material, and said first layer and said second layer imposing a magnetic bias field on said layer of resonant material, said magnetic bias field being selectively altered to thereby program said tag, wherein said soft magnetic layer has a fixed, predetermined thickness, and a plurality of non-magnetic breaks therein for selectively modifying the permeability of said soft magnetic layer, said non-magnetic breaks selectively increasing the flux carrying capacity of said soft magnetic layer.
Claim 24
Independent Claim
78 words
A method of constructing an encodable tag, said method comprising steps of: dissolving 1,1 diphenyl-2-picrylhydrazyl hydrate (DPPH) in a solvent; coating a nonmagnetic substrate on a first side with dissolved DPPH; depositing a hard magnetic bias layer having square loop properties on a second side of said nonmagnetic substrate having said dissolved DPPH; depositing a nonmagnetic layer over said hard magnetic bias layer; and coating said nonmagnetic layer with a soft magnetic material to form said encodable tag.
Claim 25
Independent Claim
78 words
A method of constructing an encodable tag, said method comprising steps of: dissolving 1,1 diphenyl-2-picrylhydrazyl hydrate (DPPH) in a solvent; coating a nonmagnetic substrate on a first side with dissolved DPPH; depositing a hard magnetic bias layer having square loop properties on a second side of said nonmagnetic substrate having said dissolved DPPH; depositing a nonmagnetic layer over said hard magnetic bias layer; and coating said nonmagnetic layer with a soft magnetic material to form said encodable tag.
Claim 26
Dependent Claim
29 words
A method as in claim 20, wherein said hard magnetic layer is selected from a group consisting of Co-Pt-Ta and Fe-Zr-RE, where RE comprises a non-s-state rare earth element.
Claim 27
Dependent Claim
21 words
A method as in claim 20, wherein said soft magnetic material is selected from a group consisting of Ni-Co-B-Si and Co-Zr.
Claim 28
Dependent Claim
28 words
A method according to claim 20, wherein said nonmagnetic substrate comprises at least one of Ge, a polymeric material, a polyester, Al 2 O 3 or amorphous silicon.
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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) | 1999-09-10 | 2000-03-11 | 2000-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-10 | 2004-03-11 | 2004-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-10 | 2008-03-11 | 2008-09-10 | $7700.00 | Window Closed / Lapsed |