# US 8,771,846 B2 · Intermetallic magnetically readable medium

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- Number: US 8,771,846 B2
- Document ID: US8771846B2
- Status: Granted
- Kind: B2
- Application number: 11/438,226
- Filed: 2006-05-23
- Published: 2007-03-29
- Granted: 2014-07-08
- Earliest claimed: 2005-05-27
- Assignees: Philip Morris USA Inc.
- Applicants: Seetharama C. Deevi; Kudumboor V. Rao; Valter Ström; Ziyan Gu
- Inventors: Seetharama C. Deevi; Kudumboor V. Rao; Valter Ström; Ziyan Gu
- Web page: https://patentgrep.com/patent/US8771846B2

## CPC

- G06K 1/125: {by magnetic means}
- C22C 38/06: containing aluminium
- G01R 33/16: Measuring susceptibility {(G01R33/1238 takes precedence)}
- G06K 19/022: {Processes or apparatus therefor}
- G06K 19/06196: {Constructional details}
- H01F 1/047: Alloys characterised by their composition
- Y10T 428/32: Composite [nonstructural laminate] of inorganic material having metal-compound-containing layer and having defined magnetic layer
- G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An intermetallic or iron aluminide magnetically readable medium and a method of forming and reading the same are provided herein. Also provided is an identification card or tag, a key, an anti-counterfeiting measure, an anti-forging measure. The intermetallic or iron aluminide magnetically readable medium includes a magnetically readable surface, wherein the magnetically readable surface contains one or more first magnetically readable regions of the intermetallic or iron aluminide surrounded by one or more second magnetically readable regions. Additionally, the intermetallic or iron aluminide magnetically readable medium can be coated, encapsulated or concealed within a material.

## Claims

### Claim 1

Intermetallic magnetically readable medium comprising:
iron aluminide,
wherein a magnetically readable surface contains one or more indentations therein smaller than 1 mm in depth forming first magnetically readable regions surrounded by one or more strain annealed regions.

### Claim 2 (depends on 1)

The intermetallic magnetically readable medium of claim 1, wherein the magnetically readable surface contains one or more first magnetically readable regions surrounded by one or more secondary magnetically readable regions, wherein the first magnetically readable regions have a higher magnetism than the second magnetically readable regions.

### Claim 3 (depends on 2)

The intermetallic magnetically readable medium of claim 2, wherein:
the one or more first magnetically readable regions define magnetically readable coding, and the one or more secondary magnetically readable regions are paramagnetic.

### Claim 4 (depends on 2)

The intermetallic magnetically readable medium of claim 2, wherein:
the one or more first magnetically readable regions comprise a plurality of plastically deformed regions having the same size and/or the same degree of deformation.

### Claim 5 (depends on 1)

The intermetallic magnetically readable medium of claim 1,
wherein the magnetically readable surface contains one or more nano- or micro-size first magnetically readable regions surrounded by one or more second strain annealed, magnetically readable regions.

### Claim 6 (depends on 1)

The intermetallic magnetically readable medium of claim 1, comprising:
the magnetically readable surface of an intermetallic sheet, film, or coating, wherein the magnetically readable surface contains one or more first magnetically readable regions surrounded by one or more second magnetically readable regions.

### Claim 7 (depends on 1)

The intermetallic magnetically readable medium of claim 1, wherein the intermetallic magnetically readable medium comprises an intermetallic comprising iron aluminide with 33 to 50 atomic % aluminum.

### Claim 8 (depends on 1)

The intermetallic magnetically readable medium of claim 1, further comprising a coating, encapsulation or concealing material on the magnetically readable surface of the intermetallic magnetically readable medium,
wherein the magnetically readable surface is capable of being read by a magnetic reader through the coating, encapsulation or concealing material.

### Claim 9

An identification card or tag, a key, an anti-counterfeiting measure, or an anti-forging measure, comprising:
an intermetallic readable medium; and
a magnetically readable surface,
wherein the magnetically readable surface contains one or more indentations therein smaller than 1 mm in depth forming first magnetically readable regions, and
wherein the intermetallic readable medium comprises an intermetallic material with the magnetically readable surface, wherein:
the magnetically readable surface contains one or more first magnetically readable regions of the intermetallic material surrounded by one or more second magnetically readable regions of the intermetallic material,
the one or more first magnetically readable regions have a higher magnetic reading than the one or more second magnetically readable regions, and wherein the second magnetically readable regions are paramagnetic, and/or
the one or more first magnetically readable regions define magnetically readable coding, one or more plastically deformed regions on the magnetically readable surface, a plurality of indentations, a barcode, a number, and/or a character recognition information; and/or
the one or more first magnetically readable regions comprise a plurality of plastically deformed regions having the same or different size and/or degree of deformation; and/or
the one or more first magnetically readable regions comprise a plurality of plastically deformed regions are not demagnetizable by magnetic forces.

### Claim 10 (depends on 9)

The identification card or tag, key, anti-counterfeiting measure, or anti-forging measure of claim 9, wherein the intermetallic readable medium comprises iron aluminide.

### Claim 11 (depends on 2)

The intermetallic magnetically readable medium of claim 2, wherein the one or more first magnetically readable regions comprise one or more plastically deformed regions on the magnetically readable surface, and the one or more secondary magnetically readable regions are paramagnetic.

### Claim 12 (depends on 2)

The intermetallic magnetically readable medium of claim 2, wherein the one or more first magnetically readable regions comprise a plurality of indentations, and the one or more secondary magnetically readable regions are paramagnetic.

### Claim 13 (depends on 2)

The intermetallic magnetically readable medium of claim 2, wherein the one or more first magnetically readable regions provide barcode, number and/or character recognition information, and the one or more secondary magnetically readable regions are paramagnetic.

### Claim 14 (depends on 2)

The intermetallic magnetically readable medium of claim 2, wherein the one or more first magnetically readable regions comprise a plurality of plastically deformed regions having different sizes and/or different degrees of deformation.

### Claim 15 (depends on 1)

The intermetallic magnetically readable medium of claim 1, wherein the one or more indentations are surrounded by one or more strain annealed regions.

### Claim 16 (depends on 1)

The intermetallic magnetically readable medium of claim 1, comprising: the magnetically readable surface of a cold rolled sheet of intermetallic wherein the magnetically readable surface contains one or more first magnetically readable regions surrounded by one or more strain annealed regions.

### Claim 17 (depends on 1)

The intermetallic magnetically readable medium of claim 1, comprising: the magnetically readable surface, wherein the magnetically readable surface contains one or more plastically deformed regions exhibiting permanent magnetic properties surrounded by one or more second magnetically readable regions exhibiting magnetically readable, paramagnetic properties.

### Claim 18 (depends on 1)

The intermetallic magnetically readable medium of claim 1, wherein the intermetallic comprises iron aluminide with iron and aluminum, and the intermetallic further comprises Mo, Zr, C, Y, Cr, Mn, B, or combinations thereof.

### Claim 19 (depends on 8)

The intermetallic magnetically readable medium of claim 8, wherein the coating, encapsulation or concealing material comprises a plastic film.