US4183989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security papers
Assignee: Portals Ltd
•
Filing: 1977-11-29
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Granted: 1980-01-15
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Expires: 1997-11-29
Abstract
Abstract A security paper which contains a security device e.g. a strip, thread or planchette having at least two machine verifiable security features thereon, one of which is a magnetic material, which may be magnetically coded or printed in a predetermined pattern on the device, and a second of which is a luminescent material, an X-ray absorbent or a metal. The provision of several features on one device provides a large increase in document security.
Inventors
- 👤 Alan J. Tooth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:29
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/44; D21H21/48; G; G07; G07D; G07D7/00; G07D7/02; G07D7/026; G07D7/04; G07D7/06; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/916; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24909; Y10T428/24917
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
65 words
A security paper which contains a security device lying substantially within the body of the paper and having at least two distinct machine verifiable security features, a first of the security features being a magnetic material and the second feature being a second and different material selected from the group consisting of: a. a luminescent material, b. an x-ray absorbent, and c. a non-magnetic metal.
Claim 2
Dependent Claim
65 words
A security paper which contains a security device lying substantially within the body of the paper and having at least two distinct machine verifiable security features, a first of the security features being a magnetic material and the second feature being a second and different material selected from the group consisting of: a. a luminescent material, b. an x-ray absorbent, and c. a non-magnetic metal.
Claim 3
Dependent Claim
38 words
A security paper as claimed in claim 1, wherein the security device contains a luminescent material selected from the group consisting of eosin, fluorescein, fluorspar, sulphate of quinine, fuchsin, calcium sulphide, Neodymium salicylate, Samarium gluconate or Yttrium salicylate.
Claim 4
Dependent Claim
19 words
A security paper as claimed in claim 1 wherein the magnetic material has variations in its magnetisation coded thereon.
Claim 5
Dependent Claim
22 words
A security paper as claimed in claim 1, wherein the security device comprises a plastics substrate having a magnetic powder layer thereon.
Claim 6
Dependent Claim
51 words
A security paper as claimed in claim 44, wherein the non-metallic substrate has a layer of metal thereon, formed by a technique selected from the group consisting of vacuum deposition, laminating a metal foil to the plastics substrate film, and adhering a layer of metal powder to the plastics substrate film.
Claim 7
Dependent Claim
30 words
A security paper as claimed in claim 1, wherein the security device is a strip having at least one security feature printed in a predetermined pattern along the length thereof.
Claim 8
Dependent Claim
20 words
A security paper as claimed in claim 6 having the magnetic material and a luminescent material printed in register thereon.
Claim 9
Dependent Claim
46 words
A security paper which contains a security device which is a strip of plastics film bearing as a first independently machine verifiable security feature a coating of a non-magnetic metal and as a second independently machine verifiable security feature a coating of a particulate magnetic material.
Claim 10
Dependent Claim
46 words
A security paper which contains a security device which is a strip of plastics film bearing as a first independently machine verifiable security feature a coating of a non-magnetic metal and as a second independently machine verifiable security feature a coating of a particulate magnetic material.
Claim 11
Dependent Claim
61 words
A process for making a security paper, which process comprises incorporating within the paper a security device which has at least two distinct machine verifiable security features, a first of the security features being a magnetic material and a second feature being selected from the group consisting of: (a) a luminescent material, (b) an X-ray absorbent, and (c) a non-magnetic metal.
Claim 12
Dependent Claim
61 words
A process for making a security paper, which process comprises incorporating within the paper a security device which has at least two distinct machine verifiable security features, a first of the security features being a magnetic material and a second feature being selected from the group consisting of: (a) a luminescent material, (b) an X-ray absorbent, and (c) a non-magnetic metal.
Claim 13
Independent Claim
92 words
A method of verifying a security paper which paper contains a security device having at least two distinct security features which method comprises detecting by a machine a magnetic property of a magnetic material which is a first of the said security features and also detecting by a machine a second of the said security features by a property selected from the group consisting of: (a) the luminescence of the security device, (b) the absorption of X-rays by the security device, and (c) the presence of non-magnetic metal in the security device.
Claim 14
Independent Claim
92 words
A method of verifying a security paper which paper contains a security device having at least two distinct security features which method comprises detecting by a machine a magnetic property of a magnetic material which is a first of the said security features and also detecting by a machine a second of the said security features by a property selected from the group consisting of: (a) the luminescence of the security device, (b) the absorption of X-rays by the security device, and (c) the presence of non-magnetic metal in the security device.
Claim 15
Dependent Claim
51 words
A method as claimed in claim 10, wherein the presence of metal is detected by a property selected from the group consisting of the reflectivity of the metal to electromagnetic radiation and the effect of the metal on a balanced circuit selected from the group of balanced capacitative and inductive circuits.
Claim 16
Dependent Claim
32 words
A method as claimed in claim 10, wherein the magnetic property of the magnetic material is a property which varies in a predetermined manner along the length of an elongate security device.
Claim 17
Dependent Claim
62 words
A method as claimed in claim 12, wherein the variation of the magnetic property is detected and compared with a variation along the length of the security device of property selected from the group consisting of: (a) the luminescence of the security device, (b) the absorption of X-rays by the security device, and (c) the presence of metal in the security device.
References Cited (Backward Citations)
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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) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |