US5421869A
Expired / Lapsed
US
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Security marking method and composition
Assignee: Nocopi Technologies Inc
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Filing: 1993-05-28
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Granted: 1995-06-06
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Expires: 2013-05-28
Abstract
Abstract A security marking method comprises marking a portion of the substrate by applying a first marking fluid which is invisible to a unaided eye when illuminated by both visible light and ultraviolet light and activating the marked portion by applying a second marking fluid thereon. The second marking fluid is reactable with the first marking fluid to be invisible to an unaided human eye when illuminated by visible light and fluorescent when illuminated by ultraviolet light. The invention also includes the composition comprising the first and second marking fluids.
Inventors
- 👤 Arshavir Gundjian
- 👤 Abraham Kuruvilla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:47
CPC Classifications
B; B41; B41M; B41M3/00; B41M3/14; B41M3/142
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
105 words
A security marking method comprising the steps of: marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and by applying a solvent to the first and second marking fluids on the substrate.
Claim 2
Dependent Claim
105 words
A security marking method comprising the steps of: marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and by applying a solvent to the first and second marking fluids on the substrate.
Claim 3
Dependent Claim
103 words
A security marking method comprising the steps of: marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from amino phthalides and quinazolines.
Claim 4
Dependent Claim
103 words
A security marking method comprising the steps of: marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from amino phthalides and quinazolines.
Claim 5
Dependent Claim
19 words
The method according to claim 2, wherein the second marking fluid is selected from novalac resins, bisphenols and hydroxybenzoates.
Claim 6
Dependent Claim
104 words
A security marking method comprising the steps of: marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from novalac resins, bisphenols and hydroxybenzoates.
Claim 7
Dependent Claim
104 words
A security marking method comprising the steps of: marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from novalac resins, bisphenols and hydroxybenzoates.
Claim 8
Dependent Claim
18 words
The method according to claim 4, wherein the second marking fluid is selected from amino phthalides and quinazolines.
Claim 9
Dependent Claim
19 words
The method according to claim 1, wherein the first and second marking fluids are each applied in solvent vehicles.
Claim 10
Dependent Claim
19 words
The method according to claim 6, wherein the solvent is selected from alcohol, acetone, methylethylketone or a combination thereof.
Claim 11
Dependent Claim
127 words
A security marking method comprising the steps of: marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first and second marking fluids are each applied as micronized particles in an aqueous solution with a binder and by applying a solvent to the applied first and second marking fluids on the substrate.
Claim 12
Dependent Claim
127 words
A security marking method comprising the steps of: marking a portion of a substrate by applying a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and activating the marked portion by applying a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first and second marking fluids are each applied as micronized particles in an aqueous solution with a binder and by applying a solvent to the applied first and second marking fluids on the substrate.
Claim 13
Dependent Claim
86 words
A security marking composition comprising: a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye, when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from amino phthalides and quinazolines.
Claim 14
Dependent Claim
86 words
A security marking composition comprising: a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye, when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from amino phthalides and quinazolines.
Claim 15
Dependent Claim
10 words
The composition according to claim 9, further comprising a solvent.
Claim 16
Dependent Claim
19 words
The composition according to claim 9, wherein the second marking fluid is selected from novalac resins, bisphenols and hydroxybenzoates.
Claim 17
Dependent Claim
87 words
A security marking composition comprising: a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from novalac resins, bisphenols and hydroxybenzoates.
Claim 18
Dependent Claim
87 words
A security marking composition comprising: a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first marking fluid is selected from novalac resins, bisphenols and hydroxybenzoates.
Claim 19
Dependent Claim
18 words
The composition according to claim 12, wherein the second marking fluid is selected from amino phthalides and quinazolines.
Claim 20
Dependent Claim
19 words
The composition according to claim 9, wherein the first and second marking fluids are each applied in solvent vehicles.
Claim 21
Dependent Claim
19 words
The composition according to claim 14, wherein the solvent is selected from alcohol, acetone, methylethylketone or a combination thereof.
Claim 22
Dependent Claim
99 words
A security marking composition comprising: a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first and second marking fluids each comprise micronized particles in an aqueous solution with a binder and each are activated by a solvent.
Claim 23
Dependent Claim
99 words
A security marking composition comprising: a first marking fluid which upon drying is invisible to an unaided human eye when illuminated by visible light or ultraviolet light; and a second marking fluid thereon, wherein the second marking fluid is reactable with the first marking fluid to be invisible upon drying to an unaided human eye when illuminated by visible light, and only visible to an unaided human eye when illuminated by ultraviolet light and wherein the first and second marking fluids each comprise micronized particles in an aqueous solution with a binder and each are activated by a solvent.
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