US3636318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Verifiable identification document
Assignee: Saab AB
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Filing: 1969-06-24
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Granted: 1972-01-18
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Expires: 1989-06-24
Abstract
Abstract A document used to assert a personal right has a randomized unique pattern of normally invisible but mechanically detectable material (e.g., finely divided ferromagnetic material) in a zone overlapping any visible indicia identifying the owner. The document is presented to a mechanical reader which scans the pattern along predetermined lines and records resultant output signals, along with an identifying record. Upon subsequent presentation, it is similarly scanned, for comparison with the recording to confirm its authenticity. Methods of producing appropriate patterns are disclosed.
Inventors
- 👤 Gunnar Lindstrom
- 👤 Gunde Schullstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:57
CPC Classifications
B; B42; B42D; B42D25/00; B42D25/30; B42D25/36; B42D25/369; B42D25/20; B42D25/21; B42D25/23; B42D25/309; G; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G07; G07C; G07C9/00; G07C9/20; G07C9/22; G07C9/23; G07F; G07F7/00; G07F7/08; G07F7/086; G07F7/10; G07F7/1025; G07F7/1058; G07F7/1066; B42D25/318; B42D25/40; B42D25/45; B42D25/465; B42D25/47
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
A document of the type intended to be carried by an individual and presented to verify or assert a right personal to him, said document being characterized by: finely divided ferromagnetic material in a scattered random pattern of nonuniform density concealed in a predetermined zone of the document, so that after the ferromagnetic material is magnetized by subjecting it to a magnetic field which is of uniform intensity in all portions of said zone, motion of a magnetic detecTor relative to the document across said zone will produce a variable but repeatable output which, when recorded, comprises a coded representation of the pattern to which subsequent reference can be made for verifying authenticity of the document.
Claim 2
Dependent Claim
116 words
A document of the type intended to be carried by an individual and presented to verify or assert a right personal to him, said document being characterized by: finely divided ferromagnetic material in a scattered random pattern of nonuniform density concealed in a predetermined zone of the document, so that after the ferromagnetic material is magnetized by subjecting it to a magnetic field which is of uniform intensity in all portions of said zone, motion of a magnetic detecTor relative to the document across said zone will produce a variable but repeatable output which, when recorded, comprises a coded representation of the pattern to which subsequent reference can be made for verifying authenticity of the document.
Claim 3
Dependent Claim
84 words
A document of the type intended to be carried by an individual and presented to verify or assert a right personal to him, said document being of the type having finely divided magnetized ferromagnetic material concealed in a predetermined zone thereof that presents a distinctive pattern of magnetization to mechanical detector means by which the document can be verified, said document being characterized by: the ferromagnetic material being distributed in said zone in a scattered random pattern of nonuniformly varying densities of such material.
Claim 4
Dependent Claim
84 words
A document of the type intended to be carried by an individual and presented to verify or assert a right personal to him, said document being of the type having finely divided magnetized ferromagnetic material concealed in a predetermined zone thereof that presents a distinctive pattern of magnetization to mechanical detector means by which the document can be verified, said document being characterized by: the ferromagnetic material being distributed in said zone in a scattered random pattern of nonuniformly varying densities of such material.
Claim 5
Dependent Claim
61 words
The document of claim 2, further characterized by: the ferromagnetic material being sandwiched between layers of other material that define the surfaces of the document, so that the presence of the ferromagnetic material is normally concealed by such other material, and so that any attempt at alteration of the pattern of distribution of the ferromagnetic material requires defacement of the document.
Claim 6
Dependent Claim
24 words
The document of claim 2, further characterized by: visible indicia identifying the authorized possessor of the document in a zone overlapping said predetermined zone.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |