US5261954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Authenticatable security paper and authenticating composition therefor
Assignee: ArjoWiggins Security SAS
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Filing: 1992-11-09
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Granted: 1993-11-16
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Expires: 2012-11-09
Abstract
Abstract A security paper authenticating system comprises, in combination, a security paper carrying both starch and an iodate salt, typically potassium iodate, and an authenticating composition comprising an acidic solution of an iodide salt, typically potassium iodide, the system being such that on applying the authenticating composition to authentic security paper, as by a pen, brush or stamp pad, iodine is generated and a characteristic starch-iodine coloration is produced. The authenticating composition is preferably aqueous or part-aqueous, and is preferably made acidic by means of a weak organic acid such as tartaric acid. The authenticating composition preferably also contains an antioxidant such as ascorbic acid. The invention extends to the paper and the authenticating composition individually.
Inventors
- 👤 Peter Collings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:36
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/44; D21H21/46
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
111 words
An authenticating composition for authenticating a security paper carrying both starch and an iodate salt, wherein said composition comprises an acidic solution of an iodide salt and is rendered acidic by the presence of a weak acid selected from the group consisting of tartaric acid, maleic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, tricarballylic acid, diglycolic acid, lactic acid, malic acid, citric acid, pyrophosphonic acid, benzene sulphonic acid, naphthalene-2-sulphonic acid, and 1-phenol-4-sulphonic acid, wherein said iodide salt and weak acid are present in the authenticating composition in amounts whereby on applying the authenticating composition to the paper, iodine is generated and a characteristic starch-iodine coloration is produced.
Claim 2
Dependent Claim
111 words
An authenticating composition for authenticating a security paper carrying both starch and an iodate salt, wherein said composition comprises an acidic solution of an iodide salt and is rendered acidic by the presence of a weak acid selected from the group consisting of tartaric acid, maleic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, tricarballylic acid, diglycolic acid, lactic acid, malic acid, citric acid, pyrophosphonic acid, benzene sulphonic acid, naphthalene-2-sulphonic acid, and 1-phenol-4-sulphonic acid, wherein said iodide salt and weak acid are present in the authenticating composition in amounts whereby on applying the authenticating composition to the paper, iodine is generated and a characteristic starch-iodine coloration is produced.
Claim 3
Dependent Claim
19 words
An authenticating composition as claimed in claim 1, wherein the pH of the composition is not more than 4.
Claim 4
Dependent Claim
13 words
An authenticating composition as claimed in claim 1, comprising a weak organic acid.
Claim 5
Dependent Claim
14 words
An authenticating composition as claimed in claim 3 wherein the acid is tartaric acid.
Claim 6
Dependent Claim
11 words
An authenticating composition as claimed in claim 1, comprising an antioxidant.
Claim 7
Dependent Claim
14 words
An authenticating composition as claimed in claim 5, wherein the antioxidant is ascorbic acid.
Claim 8
Dependent Claim
20 words
An authenticating composition as claimed in claim 1, comprising an aqueous solution of potassium iodide, tartaric acid and ascorbic acid.
Claim 9
Dependent Claim
36 words
An authenticating composition as claimed in claim 7, wherein the concentrations are as follows: potassium iodide 10 g 1 -1 ; tartaric acid 10 g 1 -1 ; and ascorbic acid 1 g 1 -1 .
Claim 10
Dependent Claim
11 words
An authenticating composition as claimed in claim 2, comprising an antioxidant.
Claim 11
Dependent Claim
14 words
An authenticating composition as claimed in claim 9, wherein the antioxidant is ascorbic acid.
Claim 12
Dependent Claim
20 words
An authenticating composition as claimed in claim 2, comprising an aqueous solution of potassium iodide, tartaric acid and ascorbic acid.
Claim 13
Dependent Claim
36 words
An authenticating composition as claimed in claim 11, wherein the concentrations are as follows: potassium iodide 10 g 1 -1 ; tartaric acid 10 g 1 -1 ; and ascorbic acid 1 g 1 -1 .
Claim 14
Dependent Claim
11 words
An authenticating composition as claimed in claim 3, comprising an antioxidant.
Claim 15
Dependent Claim
14 words
An authenticating composition as claimed in claim 13, wherein the antioxidant is ascorbic acid.
Claim 16
Dependent Claim
20 words
An authenticating composition as claimed in claim 3, comprising an aqueous solution of potassium iodide, tartaric acid and ascorbic acid.
Claim 17
Dependent Claim
36 words
An authenticating composition as claimed in claim 15, wherein the concentrations are as follows: potassium iodide 10 g 1 -1 ; tartaric acid 10 g 1 -1 ; and ascorbic acid 1 g 1 -1 .
Claim 18
Dependent Claim
11 words
An authenticating composition as claimed in claim 4, comprising an antioxidant.
Claim 19
Dependent Claim
14 words
An authenticating composition as claimed in claim 17, wherein the antioxidant is ascorbic acid.
Claim 20
Dependent Claim
20 words
An authenticating composition as claimed in claim 4, comprising an aqueous solution of potassium iodide, tartaric acid and ascorbic acid.
Claim 21
Dependent Claim
36 words
An authenticating composition as claimed in claim 19, wherein the concentrations are as follows: potassium iodide 10 g 1 -1 ; tartaric acid 10 g 1 -1 ; and ascorbic acid 1 g 1 -1 .
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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) | 1996-11-15 | 1997-05-17 | 1997-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-15 | 2001-05-17 | 2001-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-15 | 2005-05-17 | 2005-11-16 | $7700.00 | Window Closed / Lapsed |