US5365586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for fingerprinting magnetic media
Assignee: Washington University in St. Louis
•
Filing: 1993-04-09
•
Granted: 1994-11-15
•
Expires: 2013-04-09
Abstract
Abstract A method and apparatus is disclosed for determining the remanent noise in a magnetic medium by DC saturation of a region thereof and measurement of the remaining DC magnetization. A conventional magnetic recording transducer may be used to determine the remanent noise. Upon determination, the remanent noise may then be digitized and recorded on the same magnetic medium to thereby "fingerprint" the magnetic medium. This "fingerprint" may then be later used to verify and authenticate the magnetic medium as being an original. In such manner, any magnetic medium, or any object having an associated magnetic medium, may be "fingerprinted" including credit cards, computer programs, compact discs, videotapes, cassette tapes, etc.
Inventors
- 👤 Ronald S. Indeck
- 👤 Marcel W. Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:27
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/28; G11B23/283; G11B23/284; G06; G06F; G06F21/00; G06F21/10; G06F21/101; G06F21/16; G06F21/70; G06F21/78; G06F21/79; G06K; G06K1/00; G06K1/12; G06K1/125; G06K19/00; G06K19/06; G06K19/08; G06K19/083; G06K19/086; G06K19/10; G06K19/12; G06K7/00; G06K7/01; G06K7/015; G06Q; G06Q20/00; G06Q20/30; G06Q20/34; G06Q20/347; G07; G07D; G07D7/00; G07D7/04; G07F; G07F7/00; G07F7/08; G07F7/0806; G07F7/0813; G07F7/086; G07F7/12; G07F7/125; G11B20/00; G11B20/00086; G11B20/00094; G11B20/00123; G11B21/00; G11B21/02; G11B21/10; G11B21/106; G11B5/00; G11B5/48; G11B5/58; G11B5/596; G11B5/59605; G11B5/59611; G11B5/59633; G06F2211/00; G06F2211/007; Y; Y04; Y04S; Y04S40/00; Y04S40/20
Claims Analysis
Total Claims: 142
Claim 1
Independent Claim
69 words
A device for fingerprinting an object for the later determination of its identity, said object including at least in part, a magnetic medium portion, said device having means for determining a remanent noise for said medium portion, said remanent noise comprising the fingerprint for said object, and means for recording said remanent noise for later comparison with the later determination of said remanent noise to thereby identify said object.
Claim 2
Independent Claim
69 words
A device for fingerprinting an object for the later determination of its identity, said object including at least in part, a magnetic medium portion, said device having means for determining a remanent noise for said medium portion, said remanent noise comprising the fingerprint for said object, and means for recording said remanent noise for later comparison with the later determination of said remanent noise to thereby identify said object.
Claim 3
Dependent Claim
18 words
The device of claim 1 wherein said recording means has means for recording said fingerprint on said object.
Claim 4
Dependent Claim
25 words
The device of claim 2 wherein said recording means includes means for recording said remanent noise in said magnetic medium portion in machine readable form.
Claim 5
Dependent Claim
22 words
The device of claim 3 further comprising means for encrypting said remanent noise prior to its being recorded by said recording means.
Claim 6
Dependent Claim
27 words
The device of claim 4 wherein said object is a magnetic data card, and said magnetic medium portion is a magnetic stripe on said magnetic data card.
Claim 7
Dependent Claim
16 words
The device of claim 5 wherein said remanent noise is encrypted with a trap door function.
Claim 8
Dependent Claim
24 words
The device of claim 5 wherein said object is a computer diskette, and said magnetic medium portion comprises a portion of said computer diskette.
Claim 9
Dependent Claim
16 words
The device of claim 7 wherein said remanent noise is encrypted with a trap door function.
Claim 10
Dependent Claim
24 words
The device of claim 5 wherein said object is a magneto-optic disc, and said magnetic medium portion comprises a portion of said magneto-optic disc.
Claim 11
Dependent Claim
16 words
The device of claim 9 wherein said remanent noise is encrypted with a trap door function.
Claim 12
Dependent Claim
26 words
The device of claim 5 wherein said object is a magnetic recording tape, and said magnetic medium portion comprises a portion of said magnetic recording tape.
Claim 13
Dependent Claim
16 words
The device of claim 11 wherein said remanent noise is encrypted with a trap door function.
Claim 14
Dependent Claim
17 words
The device of claim 2 wherein said magnetic medium portion comprises a label affixed to said object.
Claim 15
Dependent Claim
31 words
An object having its fingerprint recorded for the later verification of its identity, said object having a magnetic medium portion, said fingerprint comprising a remanent noise for said magnetic medium portion.
Claim 16
Dependent Claim
31 words
An object having its fingerprint recorded for the later verification of its identity, said object having a magnetic medium portion, said fingerprint comprising a remanent noise for said magnetic medium portion.
Claim 17
Dependent Claim
13 words
The object of claim 14 wherein said fingerprint is recorded on said object.
Claim 18
Dependent Claim
20 words
The object of claim 15 wherein said remanent noise is recorded in said magnetic medium portion in machine readable form.
Claim 19
Dependent Claim
19 words
The object of claim 16 wherein said remanent noise is encrypted prior to its being recorded on said object.
Claim 20
Dependent Claim
27 words
The object of claim 14 wherein said object is a magnetic data card, and said magnetic medium portion is a magnetic stripe on said magnetic data card.
Claim 21
Dependent Claim
16 words
The object of claim 18 wherein said remanent noise is encrypted with a trap door function.
Claim 22
Dependent Claim
24 words
The object of claim 14 wherein said object is a computer diskette, and said magnetic medium portion comprises a portion of said computer diskette.
Claim 23
Dependent Claim
16 words
The object of claim 20 wherein said remanent noise is encrypted with a trap door function.
Claim 24
Dependent Claim
24 words
The object of claim 14 wherein said object is a magneto-optic disc, and said magnetic medium portion comprises a portion of said magneto-optic disc.
Claim 25
Dependent Claim
16 words
The object of claim 22 wherein said remanent noise is encrypted with a trap door function.
Claim 26
Dependent Claim
26 words
The object of claim 14 wherein said object is a magnetic recording tape, and said magnetic medium portion comprises a portion of said magnetic recording tape.
Claim 27
Dependent Claim
16 words
The object of claim 24 wherein said remanent noise is encrypted with a trap door function.
Claim 28
Dependent Claim
17 words
The object of claim 14 wherein said magnetic medium portion comprises a label affixed to said object.
Claim 29
Dependent Claim
37 words
The device of claim 1 wherein said determining means includes means for DC saturating a region of said magnetic medium and means for reading a residual voltage over said region, said residual voltage comprising said remanent noise.
Claim 30
Dependent Claim
21 words
The device of claim 27 wherein said region comprises a linear portion extending between about 30 micrometers and about 4300 micrometers.
Claim 31
Dependent Claim
25 words
The device of claim 27 wherein said determining means further comprises means for averaging a plurality of residual voltage readings, said average comprising said fingerprint.
Claim 32
Dependent Claim
15 words
The device of claim 1 wherein said determining means comprises a conventional magnetic recording head.
Claim 33
Independent Claim
79 words
A device for authenticating an object having a fingerprint recorded, said object having a magnetic medium portion, said fingerprint comprising a remanent noise for said medium portion, said device including means for reading said recorded fingerprint, means for translating said remanent noise from said fingerprint, means for determining a remanent noise directly from said magnetic medium portion, and means for comparing said translated remanent noise with said determined remanent noise to determine whether they match, thereby authenticating said object.
Claim 34
Independent Claim
79 words
A device for authenticating an object having a fingerprint recorded, said object having a magnetic medium portion, said fingerprint comprising a remanent noise for said medium portion, said device including means for reading said recorded fingerprint, means for translating said remanent noise from said fingerprint, means for determining a remanent noise directly from said magnetic medium portion, and means for comparing said translated remanent noise with said determined remanent noise to determine whether they match, thereby authenticating said object.
Claim 35
Dependent Claim
13 words
The device of claim 31 wherein said object has its fingerprint recorded thereon.
Claim 36
Dependent Claim
19 words
The device of claim 31 wherein said fingerprint is recorded in said magnetic medium portion in machine readable form.
Claim 37
Dependent Claim
20 words
The device of claim 33 wherein said fingerprint is encrypted, and said translation means includes means for de-crypting said fingerprint.
Claim 38
Dependent Claim
26 words
The device of claim 34 wherein said object is a magnetic data card, said magnetic medium portion is a magnetic stripe on said magnetic data card.
Claim 39
Dependent Claim
16 words
The device of claim 35 wherein said remanent noise is encrypted with a trap door function.
Claim 40
Dependent Claim
24 words
The device of claim 31 wherein said object is a computer diskette, and said magnetic medium portion comprises a portion of said computer diskette.
Claim 41
Dependent Claim
16 words
The device of claim 37 wherein said remanent noise is encrypted with a trap door function.
Claim 42
Dependent Claim
24 words
The device of claim 31 wherein said object is a magneto-optic disc, and said magnetic medium portion comprises a portion of said magneto-optic disc.
Claim 43
Dependent Claim
16 words
The device of claim 39 wherein said remanent noise is encrypted with a trap door function.
Claim 44
Dependent Claim
26 words
The device of claim 31 wherein said object is a magnetic recording tape, and said magnetic medium portion comprises a portion of said magnetic recording tape.
Claim 45
Dependent Claim
16 words
The device of claim 40 wherein said remanent noise is encrypted with a trap door function.
Claim 46
Dependent Claim
17 words
The device of claim 31 wherein said magnetic medium portion comprises a label affixed to said object.
Claim 47
Independent Claim
62 words
A method for authenticating an object, said object including at least in part a magnetic medium portion, said object having a fingerprint recorded, said fingerprint comprising a previously determined remanent noise for said medium portion, said method comprising the steps of: determining a remanent noise directly from said medium portion, reading said fingerprint, and comparing said determined remanent noise with said fingerprint.
Claim 48
Independent Claim
62 words
A method for authenticating an object, said object including at least in part a magnetic medium portion, said object having a fingerprint recorded, said fingerprint comprising a previously determined remanent noise for said medium portion, said method comprising the steps of: determining a remanent noise directly from said medium portion, reading said fingerprint, and comparing said determined remanent noise with said fingerprint.
Claim 49
Dependent Claim
34 words
The method of claim 44 wherein said fingerprint comprises a machine readable representation of said previously determined remanent noise, and the step of reading includes the step of reading said fingerprint with a machine.
Claim 50
Dependent Claim
27 words
The method of claim 45 wherein said fingerprint comprises an encrypted representation of said previously determined remanent noise, and further comprising the step of de-crypting said fingerprint.
Claim 51
Independent Claim
64 words
A method for fingerprinting an object for the later determination of its identity, said object including at least in part a magnetic medium portion, said method comprising the steps of determining a remanent noise for said medium portion, said remanent noise comprising said fingerprint, and recording said fingerprint on said object for the later comparison thereof with the later determination of said remanent noise.
Claim 52
Independent Claim
64 words
A method for fingerprinting an object for the later determination of its identity, said object including at least in part a magnetic medium portion, said method comprising the steps of determining a remanent noise for said medium portion, said remanent noise comprising said fingerprint, and recording said fingerprint on said object for the later comparison thereof with the later determination of said remanent noise.
Claim 53
Dependent Claim
16 words
The method of claim 47 further comprising the step of encrypting said fingerprint prior to recording.
Claim 54
Independent Claim
81 words
A device for fingerprinting an object for the later determination of its identity, said object including at least in part, a magnetic medium portion, said device having means for determining a ramanent noise for a length of no more than about several hundreds of micrometers of said medium portion, said ramanent noise comprising the fingerprint for said object, and means for recording said remanent noise for later comparison with the later determination of said remanent noise to thereby identify said object.
Claim 55
Independent Claim
81 words
A device for fingerprinting an object for the later determination of its identity, said object including at least in part, a magnetic medium portion, said device having means for determining a ramanent noise for a length of no more than about several hundreds of micrometers of said medium portion, said ramanent noise comprising the fingerprint for said object, and means for recording said remanent noise for later comparison with the later determination of said remanent noise to thereby identify said object.
Claim 56
Dependent Claim
18 words
The device of claim 49 wherein said recording means has means for recording said fingerprint on said object.
Claim 57
Dependent Claim
25 words
The device of claim 50 wherein said recording means includes means for recording said remanent noise in said magnetic medium portion in machine readable form.
Claim 58
Dependent Claim
22 words
The device of claim 51 further comprising means for encrypting said remanent noise prior to its being recorded by said recording means.
Claim 59
Dependent Claim
27 words
The device of claim 52 wherein said object is a magnetic data card, and said magnetic medium portion is a magnetic stripe on said magnetic data card.
Claim 60
Dependent Claim
24 words
The device of claim 51 wherein said object is a computer diskette, and said magnetic medium portion comprises a portion of said computer diskette.
Claim 61
Independent Claim
73 words
A device for fingerprinting an object for the later determination of its identity, said object including at least in part, a magnetic medium portion, said device having means for determining a remanent noise from a magnetic micro-structure for said medium portion, said remanent noise comprising the fingerprint for said object, and means for recording said remanent noise for later comparison with the later determination of said remanent noise to thereby identify said object.
Claim 62
Independent Claim
73 words
A device for fingerprinting an object for the later determination of its identity, said object including at least in part, a magnetic medium portion, said device having means for determining a remanent noise from a magnetic micro-structure for said medium portion, said remanent noise comprising the fingerprint for said object, and means for recording said remanent noise for later comparison with the later determination of said remanent noise to thereby identify said object.
Claim 63
Dependent Claim
18 words
The device of claim 55 wherein said recording means has means for recording said fingerprint on said object.
Claim 64
Dependent Claim
25 words
The device of claim 56 wherein said recording means includes means for recording said remanent noise in said magnetic medium portion in machine readable form.
Claim 65
Dependent Claim
22 words
The device of claim 57 further comprising means for encrypting said remanent noise prior to its being recorded by said recording means.
Claim 66
Dependent Claim
27 words
The device of claim 58 wherein said object is a magnetic data card, and said magnetic medium portion is a magnetic stripe on said magnetic data card.
Claim 67
Dependent Claim
24 words
The device of claim 57 wherein said object is a computer diskette, and said magnetic medium portion comprises a portion of said computer diskette.
Claim 68
Independent Claim
71 words
A device for fingerprinting an object for the later determination of its identity, said object including at least in part, a uniformly manufactured magnetic medium portion, said device having means for determining a remanent noise for said medium portion, said remanent noise comprising the fingerprint for said object, and means for recording said remanent noise for later comparison with the later determination of said remanent noise to thereby identify said object.
Claim 69
Independent Claim
71 words
A device for fingerprinting an object for the later determination of its identity, said object including at least in part, a uniformly manufactured magnetic medium portion, said device having means for determining a remanent noise for said medium portion, said remanent noise comprising the fingerprint for said object, and means for recording said remanent noise for later comparison with the later determination of said remanent noise to thereby identify said object.
Claim 70
Dependent Claim
18 words
The device of claim 61 wherein said recording means has means for recording said fingerprint on said object.
Claim 71
Dependent Claim
25 words
The device of claim 62 wherein said recording means includes means for recording said remanent noise in said magnetic medium portion in machine readable form.
Claim 72
Dependent Claim
27 words
The device of claim 63 wherein said object is a magnetic data card, and said magnetic medium portion is a magnetic stripe on said magnetic data card.
Claim 73
Dependent Claim
24 words
The device of claim 63 wherein said object is a computer diskette, and said magnetic medium portion comprises a portion of said computer diskette.
Claim 74
Dependent Claim
40 words
An object having its fingerprint recorded for the later verification of its identity, said object having a magnetic medium portion, said fingerprint comprising a remanent noise for no more than about several hundreds of micrometers of said magnetic medium portion.
Claim 75
Dependent Claim
40 words
An object having its fingerprint recorded for the later verification of its identity, said object having a magnetic medium portion, said fingerprint comprising a remanent noise for no more than about several hundreds of micrometers of said magnetic medium portion.
Claim 76
Dependent Claim
13 words
The object of claim 66 wherein said fingerprint is recorded on said object.
Claim 77
Dependent Claim
20 words
The object of claim 67 wherein said remanent noise is recorded in said magnetic medium portion in machine readable form.
Claim 78
Dependent Claim
19 words
The object of claim 68 wherein said remanent noise is encrypted prior to its being recorded on said object.
Claim 79
Dependent Claim
27 words
The object of claim 68 wherein said object is a magnetic data card, and said magnetic medium portion is a magnetic stripe on said magnetic data card.
Claim 80
Dependent Claim
24 words
The object of claim 68 wherein said object is a computer diskette, and said magnetic medium portion comprises a portion of said computer diskette.
Claim 81
Dependent Claim
26 words
The object of claim 68 wherein said object is a magnetic recording tape, and said magnetic medium portion comprises a portion of said magnetic recording tape.
Claim 82
Dependent Claim
35 words
An object having its fingerprint recorded for the later verification of its identity, said object having a magnetic medium portion, said fingerprint comprising a remanent noise from a magnetic micro-structure for said magnetic medium portion.
Claim 83
Dependent Claim
35 words
An object having its fingerprint recorded for the later verification of its identity, said object having a magnetic medium portion, said fingerprint comprising a remanent noise from a magnetic micro-structure for said magnetic medium portion.
Claim 84
Dependent Claim
13 words
The object of claim 73 wherein said fingerprint is recorded on said object.
Claim 85
Dependent Claim
20 words
The object of claim 74 wherein said remanent noise is recorded in said magnetic medium portion in machine readable form.
Claim 86
Dependent Claim
19 words
The object of claim 75 wherein said remanent noise is encrypted prior to its being recorded on said object.
Claim 87
Dependent Claim
27 words
The object of claim 75 wherein said object is a magnetic data card, and said magnetic medium portion is a magnetic stripe on said magnetic data card.
Claim 88
Dependent Claim
24 words
The object of claim 75 wherein said object is a computer diskette, and said magnetic medium portion comprises a portion of said computer diskette.
Claim 89
Dependent Claim
26 words
The object of claim 75 wherein said object is a magnetic recording tape, and said magnetic medium portion comprises a portion of said magnetic recording tape.
Claim 90
Dependent Claim
33 words
An object having its fingerprint recorded for the later verification of its identity, said object having a uniformly manufactured magnetic medium portion, said fingerprint comprising a remanent noise for said magnetic medium portion.
Claim 91
Dependent Claim
33 words
An object having its fingerprint recorded for the later verification of its identity, said object having a uniformly manufactured magnetic medium portion, said fingerprint comprising a remanent noise for said magnetic medium portion.
Claim 92
Dependent Claim
13 words
The object of claim 80 wherein said fingerprint is recorded on said object.
Claim 93
Dependent Claim
20 words
The object of claim 81 wherein said remanent noise is recorded in said magnetic medium portion in machine readable form.
Claim 94
Dependent Claim
19 words
The object of claim 82 wherein said remanent noise is encrypted prior to its being recorded on said object.
Claim 95
Dependent Claim
27 words
The object of claim 82 wherein said object is a magnetic data card, and said magnetic medium portion is a magnetic stripe on said magnetic data card.
Claim 96
Dependent Claim
24 words
The object of claim 82 wherein said object is a computer diskette, and said magnetic medium portion comprises a portion of said computer diskette.
Claim 97
Dependent Claim
26 words
The object of claim 82 wherein said object is a magnetic recording tape, and said magnetic medium portion comprises a portion of said magnetic recording tape.
Claim 98
Independent Claim
91 words
A device for authenticating an object having a fingerprint recorded, said object having a magnetic medium portion, said fingerprint comprising a remanent noise for a length of no more than about several hundreds of micrometers of said medium portion, said device including means for reading said recorded fingerprint, means for translating said remanent noise from said fingerprint, means for determining a remanent noise directly from said magnetic medium portion, and means for comparing said translated remanent noise with said determined remanent noise to determine whether they match, thereby authenticating said object.
Claim 99
Independent Claim
91 words
A device for authenticating an object having a fingerprint recorded, said object having a magnetic medium portion, said fingerprint comprising a remanent noise for a length of no more than about several hundreds of micrometers of said medium portion, said device including means for reading said recorded fingerprint, means for translating said remanent noise from said fingerprint, means for determining a remanent noise directly from said magnetic medium portion, and means for comparing said translated remanent noise with said determined remanent noise to determine whether they match, thereby authenticating said object.
Claim 100
Dependent Claim
13 words
The device of claim 87 wherein said object has its fingerprint recorded thereon.
Claim 101
Dependent Claim
19 words
The device of claim 87 wherein said fingerprint is recorded in said magnetic medium portion in machine readable form.
Claim 102
Dependent Claim
20 words
The device of claim 89 wherein said fingerprint is encrypted, and said translation means includes means for decrypting said fingerprint.
Claim 103
Dependent Claim
26 words
The device of claim 90 wherein said object is a magnetic data card, said magnetic medium portion is a magnetic stripe on said magnetic data card.
Claim 104
Dependent Claim
24 words
The device of claim 87 wherein said object is a computer diskette, and said magnetic medium portion comprises a portion of said computer diskette.
Claim 105
Dependent Claim
26 words
The device of claim 87 wherein said object is a magnetic recording tape, and said magnetic medium portion comprises a portion of said magnetic recording tape.
Claim 106
Independent Claim
83 words
A device for authenticating an object having a fingerprint recorded, said object having a magnetic medium portion, said fingerprint comprising a remanent noise from a magnetic micro-structure for said medium portion, said device including means for reading said recorded fingerprint, means for translating said remanent noise from said fingerprint, means for determining a remanent noise directly from said magnetic medium portion, and means for comparing said translated remanent noise with said determined remanent noise to determine whether they match, thereby authenticating said object.
Claim 107
Independent Claim
83 words
A device for authenticating an object having a fingerprint recorded, said object having a magnetic medium portion, said fingerprint comprising a remanent noise from a magnetic micro-structure for said medium portion, said device including means for reading said recorded fingerprint, means for translating said remanent noise from said fingerprint, means for determining a remanent noise directly from said magnetic medium portion, and means for comparing said translated remanent noise with said determined remanent noise to determine whether they match, thereby authenticating said object.
Claim 108
Dependent Claim
13 words
The device of claim 94 wherein said object has its fingerprint recorded thereon.
Claim 109
Dependent Claim
19 words
The device of claim 94 wherein said fingerprint is recorded in said magnetic medium portion in machine readable form.
Claim 110
Dependent Claim
20 words
The device of claim 96 wherein said fingerprint is encrypted, and said translation means includes means for decrypting said fingerprint.
Claim 111
Dependent Claim
26 words
The device of claim 97 wherein said object is a magnetic data card, said magnetic medium portion is a magnetic stripe on said magnetic data card.
Claim 112
Dependent Claim
24 words
The device of claim 94 wherein said object is a computer diskette, and said magnetic medium portion comprises a portion of said computer diskette.
Claim 113
Dependent Claim
26 words
The device of claim 94 wherein said object is a magnetic recording tape, and said magnetic medium portion comprises a portion of said magnetic recording tape.
Claim 114
Independent Claim
81 words
A device for authenticating an object having a fingerprint recorded, said object having a uniformly manufactured magnetic medium portion, said fingerprint comprising a remanent noise for said medium portion, said device including means for reading said recorded fingerprint, means for translating said remanent noise from said fingerprint, means for determining a remanent noise directly from said magnetic medium portion, and means for comparing said translated remanent noise with said determined remanent noise to determine whether they match, thereby authenticating said object.
Claim 115
Independent Claim
81 words
A device for authenticating an object having a fingerprint recorded, said object having a uniformly manufactured magnetic medium portion, said fingerprint comprising a remanent noise for said medium portion, said device including means for reading said recorded fingerprint, means for translating said remanent noise from said fingerprint, means for determining a remanent noise directly from said magnetic medium portion, and means for comparing said translated remanent noise with said determined remanent noise to determine whether they match, thereby authenticating said object.
Claim 116
Dependent Claim
13 words
The device of claim 101 wherein said object has its fingerprint recorded thereon.
Claim 117
Dependent Claim
19 words
The device of claim 101 wherein said fingerprint is recorded in said magnetic medium portion in machine readable form.
Claim 118
Dependent Claim
20 words
The device of claim 103 wherein said fingerprint is encrypted, and said translation means includes means for decrypting said fingerprint.
Claim 119
Dependent Claim
26 words
The device of claim 104 wherein said object is a magnetic data card, said magnetic medium portion is a magnetic stripe on said magnetic data card.
Claim 120
Dependent Claim
24 words
The device of claim 101 wherein said object is a computer diskette, and said magnetic medium portion comprises a portion of said computer diskette.
Claim 121
Dependent Claim
26 words
The device of claim 101 wherein said object is a magnetic recording tape, and said magnetic medium portion comprises a portion of said magnetic recording tape.
Claim 122
Independent Claim
83 words
A method for authenticating an object, said object including at least in part a magnetic medium portion, said object having a fingerprint recorded, said fingerprint comprising a previously determined remanent noise for a length of no more than about several hundreds of micrometers of said medium portion, said method comprising the steps of: determining a remanent noise directly from said medium portion, reading said fingerprint, and correlating said determined remanent noise with said fingerprint, said correlation thereby indicating if said object is authentic.
Claim 123
Independent Claim
83 words
A method for authenticating an object, said object including at least in part a magnetic medium portion, said object having a fingerprint recorded, said fingerprint comprising a previously determined remanent noise for a length of no more than about several hundreds of micrometers of said medium portion, said method comprising the steps of: determining a remanent noise directly from said medium portion, reading said fingerprint, and correlating said determined remanent noise with said fingerprint, said correlation thereby indicating if said object is authentic.
Claim 124
Dependent Claim
34 words
The method of claim 108 wherein said fingerprint comprises a machine readable representation of said previously determined remanent noise, and the step of reading includes the step of reading said fingerprint with a machine.
Claim 125
Dependent Claim
27 words
The method of claim 109 wherein said fingerprint comprises an encrypted representation of said previously determined remanent noise, and further comprising the step of decrypting said fingerprint.
Claim 126
Independent Claim
75 words
A method for authenticating an object, said object including at least in part a magnetic medium portion, said object having a fingerprint recorded, said fingerprint comprising a previously determined remanent noise from a magnetic micro-structure for said medium portion, said method comprising the steps of: determining a remanent noise directly from said medium portion, reading said fingerprint, and correlating said determined remanent noise with said fingerprint, said correlation thereby indicating if said object is authentic.
Claim 127
Independent Claim
75 words
A method for authenticating an object, said object including at least in part a magnetic medium portion, said object having a fingerprint recorded, said fingerprint comprising a previously determined remanent noise from a magnetic micro-structure for said medium portion, said method comprising the steps of: determining a remanent noise directly from said medium portion, reading said fingerprint, and correlating said determined remanent noise with said fingerprint, said correlation thereby indicating if said object is authentic.
Claim 128
Dependent Claim
34 words
The method of claim 111 wherein said fingerprint comprises a machine readable representation of said previously determined remanent noise, and the step of reading includes the step of reading said fingerprint with a machine.
Claim 129
Dependent Claim
27 words
The method of claim 112 wherein said fingerprint comprises an encrypted representation of said previously determined remanent noise, and further comprising the step of decrypting said fingerprint.
Claim 130
Independent Claim
73 words
A method for authenticating an object, said object including at least in part a uniformly manufactured magnetic medium portion, said object having a fingerprint recorded, said fingerprint comprising a previously determined remanent noise for said medium portion, said method comprising the steps of: determining a remanent noise directly from said medium portion, reading said fingerprint, and correlating said determined remanent noise with said fingerprint, said correlation thereby indicating if said object is authentic.
Claim 131
Independent Claim
73 words
A method for authenticating an object, said object including at least in part a uniformly manufactured magnetic medium portion, said object having a fingerprint recorded, said fingerprint comprising a previously determined remanent noise for said medium portion, said method comprising the steps of: determining a remanent noise directly from said medium portion, reading said fingerprint, and correlating said determined remanent noise with said fingerprint, said correlation thereby indicating if said object is authentic.
Claim 132
Dependent Claim
34 words
The method of claim 114 wherein said fingerprint comprises a machine readable representation of said previously determined remanent noise, and the step of reading includes the step of reading said fingerprint with a machine.
Claim 133
Dependent Claim
27 words
The method of claim 115 wherein said fingerprint comprises an encrypted representation of said previously determined remanent noise, and further comprising the step of decrypting said fingerprint.
Claim 134
Independent Claim
76 words
A method for fingerprinting an object for the later determination of its identity, said object including at least in part a magnetic medium portion, said method comprising the steps of determining a remanent noise for a length of no more than about several hundreds of micrometers of said medium portion, said remanent noise comprising said fingerprint, and recording said fingerprint on said object for the later comparison thereof with the later determination of said remanent noise.
Claim 135
Independent Claim
76 words
A method for fingerprinting an object for the later determination of its identity, said object including at least in part a magnetic medium portion, said method comprising the steps of determining a remanent noise for a length of no more than about several hundreds of micrometers of said medium portion, said remanent noise comprising said fingerprint, and recording said fingerprint on said object for the later comparison thereof with the later determination of said remanent noise.
Claim 136
Dependent Claim
16 words
The method of claim 117 further comprising the step of encrypting said fingerprint prior to recording.
Claim 137
Independent Claim
68 words
A method for fingerprinting an object for the later determination of its identity, said object including at least in part a magnetic medium portion, said method comprising the steps of determining a remanent noise from a magnetic micro-structure for said medium portion, said remanent noise comprising said fingerprint, and recording said fingerprint on said object for the later comparison thereof with the later determination of said remanent noise.
Claim 138
Independent Claim
68 words
A method for fingerprinting an object for the later determination of its identity, said object including at least in part a magnetic medium portion, said method comprising the steps of determining a remanent noise from a magnetic micro-structure for said medium portion, said remanent noise comprising said fingerprint, and recording said fingerprint on said object for the later comparison thereof with the later determination of said remanent noise.
Claim 139
Dependent Claim
16 words
The method of claim 119 further comprising the step of encrypting said fingerprint prior to recording.
Claim 140
Independent Claim
66 words
A method for fingerprinting an object for the later determination of its identity, said object including at least in part a uniformly manufactured magnetic medium portion, said method comprising the steps of determining a remanent noise for said medium portion, said remanent noise comprising said fingerprint, and recording said fingerprint on said object for the later comparison thereof with the later determination of said remanent noise.
Claim 141
Independent Claim
66 words
A method for fingerprinting an object for the later determination of its identity, said object including at least in part a uniformly manufactured magnetic medium portion, said method comprising the steps of determining a remanent noise for said medium portion, said remanent noise comprising said fingerprint, and recording said fingerprint on said object for the later comparison thereof with the later determination of said remanent noise.
Claim 142
Dependent Claim
16 words
The method of claim 121 further comprising the step of encrypting said fingerprint prior to recording.
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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) | 1997-11-14 | 1998-05-16 | 1998-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-14 | 2002-05-16 | 2002-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-14 | 2006-05-16 | 2006-11-15 | $7700.00 | Window Closed / Lapsed |