Patent US5912205A successfully refreshed from Google Patents.
US5912205A
Expired / Lapsed
US
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Heat resistant security document
Assignee: Sr Acquisition Corp
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Filing: 1997-01-30
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Granted: 1999-06-15
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Expires: 2017-01-30
Abstract
Abstract A security document is provided containing a color-forming composition having an insulating material therein which allows the document to be passed through heated printing devices such as laser printers without the problem of premature color development. The color-forming composition includes a mixture of a color former, a color developer, and an insulating material. In a preferred embodiment, a toner adhesion-enhancing composition containing an insulating material is applied over the color-forming composition. The security document may be used to provide an authentication feature and/or an indication of attempted alterations from the use of solvents, heat or abrasion.
Inventors
- 👤 A. Dale Lakes
- 👤 Mark Dotson
- 👤 Rajendra Mehta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:03
CPC Classifications
B; B41; B41M; B41M3/00; B41M3/14; B41M3/142
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
87 words
A security document which is resistant to premature coloration by heat comprising a substrate having first and second major surfaces, at least one of said major surfaces having thereon a composition comprising an initially colorless color former and a color developer which composition activates to produce a color upon the application of a solvent, heat sufficient to cause said composition to melt, or abrasion, said composition including an insulating material which prevents premature melting of said composition when said document is passed through a noncontact printing device.
Claim 2
Dependent Claim
87 words
A security document which is resistant to premature coloration by heat comprising a substrate having first and second major surfaces, at least one of said major surfaces having thereon a composition comprising an initially colorless color former and a color developer which composition activates to produce a color upon the application of a solvent, heat sufficient to cause said composition to melt, or abrasion, said composition including an insulating material which prevents premature melting of said composition when said document is passed through a noncontact printing device.
Claim 3
Dependent Claim
33 words
The security document of claim 1 in which said composition is applied to provide a dry coating weight of between about 0.4 and 0.5 lbs/1300 ft. 2 (1.52 to 1.9 g/m 2 ).
Claim 4
Dependent Claim
25 words
The security document of claim 1 in which said color former comprises a leuco dye having a melting point of greater than about 150° C.
Claim 5
Dependent Claim
24 words
The security document of claim 2 in which said color developer comprises a phenolic resin having a melting point of greater than 150° C.
Claim 6
Dependent Claim
22 words
The security document of claim 1 in which said composition is printed on said substrate in the form of covert warning indicia.
Claim 7
Dependent Claim
22 words
The security document of claim 1 in which said composition is printed on said substrate in the form of covert authentication indicia.
Claim 8
Dependent Claim
17 words
The security document of claim 1 in which said insulating material comprises hollow or solid polymeric spheres.
Claim 9
Dependent Claim
15 words
The security document of claim 7 in which said polymeric spheres are comprised of polystyrene.
Claim 10
Dependent Claim
30 words
The security document of claim 1 further including a toner adhesion-enhancing composition overlying said composition, said toner adhesion enhancing composition comprising a polymeric toner adhesion-enhancing coating and an insulating material.
Claim 11
Dependent Claim
16 words
The security document of claim 9 in which said toner adhesion enhancing composition comprises a latex.
Claim 12
Dependent Claim
35 words
The security document of claim 9 in which said toner adhesion-enhancing composition is applied to provide a dry coating weight of between about 0.25 and 0.35 lbs./1300 ft. 2 (0.95 to 1.33 g/m 2 ).
Claim 13
Dependent Claim
23 words
The security document of claim 9 in which said insulating material in said toner adhesion enhancing composition comprises hollow or solid polymeric spheres.
Claim 14
Dependent Claim
14 words
The security document of claim 12 in which said hollow polymeric spheres comprise polystyrene.
Claim 15
Dependent Claim
21 words
The security document of claim 9 in which said polymeric toner adhesion-enhancing composition comprises a copolymer of styrene and acrylic acid.
Claim 16
Dependent Claim
108 words
A security document which is resistant to premature coloration by heat comprising a substrate having first and second major surfaces, at least one of said major surfaces having thereon a color-forming composition comprising an initially colorless color former and a color developer which color-forming composition activates to produce a color upon the application of a solvent, heat sufficient to cause said color-forming composition to melt, or abrasion, and a toner adhesion-enhancing composition overlying said color-forming composition, wherein both said color-forming composition and said toner adhesion-enhancing composition include an insulating material which prevents premature melting of said color-forming composition when said document is passed through a noncontact printing device.
Claim 17
Dependent Claim
108 words
A security document which is resistant to premature coloration by heat comprising a substrate having first and second major surfaces, at least one of said major surfaces having thereon a color-forming composition comprising an initially colorless color former and a color developer which color-forming composition activates to produce a color upon the application of a solvent, heat sufficient to cause said color-forming composition to melt, or abrasion, and a toner adhesion-enhancing composition overlying said color-forming composition, wherein both said color-forming composition and said toner adhesion-enhancing composition include an insulating material which prevents premature melting of said color-forming composition when said document is passed through a noncontact printing device.
Claim 18
Dependent Claim
13 words
The security document of claim 15 in which said composition includes a binder.
Claim 19
Dependent Claim
23 words
The security document of claim 15 in which said insulating material comprises from about 20 to 40% by weight of said color-forming composition.
Claim 20
Dependent Claim
24 words
The security document of claim 15 in which said insulating material comprises from about 20 to 40% by weight of said toner adhesion-enhancing composition.
Claim 21
Dependent Claim
21 words
The security document of claim 15 in which said toner adhesion-enhancing composition comprises from about 5 to 12% by weight latex.
Claim 22
Dependent Claim
103 words
A security document which is resistant to premature coloration by heat comprising a substrate having first and second major surfaces, at least a portion of one of said major surfaces having thereon a composition comprising an initially colorless color former and a color developer which composition activates to produce a color when said substrate is subjected to authentication or attempted tampering or alteration by the application of a solvent, heat sufficient to cause said composition to melt, or by abrasion, said composition including an insulating material which prevents premature melting of said composition when said document is passed through a noncontact printing device.
Claim 23
Dependent Claim
103 words
A security document which is resistant to premature coloration by heat comprising a substrate having first and second major surfaces, at least a portion of one of said major surfaces having thereon a composition comprising an initially colorless color former and a color developer which composition activates to produce a color when said substrate is subjected to authentication or attempted tampering or alteration by the application of a solvent, heat sufficient to cause said composition to melt, or by abrasion, said composition including an insulating material which prevents premature melting of said composition when said document is passed through a noncontact printing device.
Claim 24
Dependent Claim
22 words
The security document of claim 20 in which said composition is printed on said substrate in the form of covert warning indicia.
Claim 25
Dependent Claim
22 words
The security document of claim 20 in which said composition is printed on said substrate in the form of covert authentication indicia.
Claim 26
Dependent Claim
25 words
The security document of claim 20 in which said composition is printed on said substrate in the form of covert warning indicia and authentication indicia.
Claim 27
Independent Claim
116 words
A method of printing a heat resistant security document comprising the steps of: providing a substrate having first and second major surfaces; coating at least one major surface of said substrate with a composition which may be activated to produce a color, said composition comprising an initially colorless color former and a color developer and including an insulating material which prevents heat transfer from a laser printer to said composition preventing premature melting of said composition; printing said substrate using a laser printer; and exposing said substrate to a solvent, heat at a temperature of about 400° F. for at least about 1 second, or abrasion such that said composition is activated to form a color.
Claim 28
Independent Claim
116 words
A method of printing a heat resistant security document comprising the steps of: providing a substrate having first and second major surfaces; coating at least one major surface of said substrate with a composition which may be activated to produce a color, said composition comprising an initially colorless color former and a color developer and including an insulating material which prevents heat transfer from a laser printer to said composition preventing premature melting of said composition; printing said substrate using a laser printer; and exposing said substrate to a solvent, heat at a temperature of about 400° F. for at least about 1 second, or abrasion such that said composition is activated to form a color.
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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) | 2002-06-14 | 2002-12-14 | 2003-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-06-14 | 2006-12-14 | 2007-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-06-14 | 2010-12-14 | 2011-06-15 | $7700.00 | Window Closed / Lapsed |