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US4983415A
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Method of making permanent images on recording surface having a thermosensitive color-developing layer thereon
Assignee: INDENTICATOR ACQUISITION CORP
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Filing: 1989-07-21
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Granted: 1991-01-08
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Expires: 2009-07-21
Abstract
Abstract An inkless method of recording an image of a desired object or symbol such as the print of a person's finger is described in which a recording surface is prepared by placing thereon a thermosensitive color-developing layer comprising a chromogenic dye such as a leuco dye, an organic acid developer, such as a phenolic compound, reactive with the dye to form a color and a thermosensitive barrier layer separating the dye and developer. A chemical reagent containing one or more metallic slats, such as ferric chloride, in the format of the desired object or symbol, is applied to the recording where the reagent reacts with the developer and/or dye in the thermosensitive color-developing layer to form a permanent two-dimensional image of the object or symbol such as the ridge pattern of the person's finger.
Inventors
- 👤 Douglas C. Arndt
- 👤 Virgle L. Hedgcoth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:23
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; A; A61; A61B; A61B5/00; A61B5/117; A61B5/1171; A61B5/1172
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
143 words
A method of recording prints of a person's finger, palm or foot comprising: (a) providing a thermosensitive recording surface containing a thermosensitive color-developing layer, the layer comprising a chromogenic dye, an organic acid developer reactive with the dye to develop a color and a thermosensitive barrier for separating the acid and the dye; (b) applying a solution of a chemical reagent containing one or more metallic salts to the fingerprint, palm print or footprint area of a person whose finger, palms or foot is to printed; (c) depositing the solution of the chemical reagent from the ridges of the fingerprint, palm print or footprint pattern area to said recording surface whereby the chemical reagent reacts with the organic acid or dye or both to provide a permanent colorant product representative of the ridge pattern of the finger, palm or foot of said person.
Claim 2
Independent Claim
143 words
A method of recording prints of a person's finger, palm or foot comprising: (a) providing a thermosensitive recording surface containing a thermosensitive color-developing layer, the layer comprising a chromogenic dye, an organic acid developer reactive with the dye to develop a color and a thermosensitive barrier for separating the acid and the dye; (b) applying a solution of a chemical reagent containing one or more metallic salts to the fingerprint, palm print or footprint area of a person whose finger, palms or foot is to printed; (c) depositing the solution of the chemical reagent from the ridges of the fingerprint, palm print or footprint pattern area to said recording surface whereby the chemical reagent reacts with the organic acid or dye or both to provide a permanent colorant product representative of the ridge pattern of the finger, palm or foot of said person.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the developer includes one or more phenolic compounds.
Claim 4
Independent Claim
12 words
The method of claim wherein the developer is comprised of bisphenol A.
Claim 5
Dependent Claim
45 words
The method of claim 1 wherein the metallic salts are selected from the group consisting of the salts of Titanium, Zirconium, Hafnium, Vanadium, Niobium, Tantalum, Chromium, Molybdenum, Tungsten, Manganese, Rhenium, Iron, Ruthenium, Cobalt, Rhodium, Iridium, Nickel, Palladium, Platinum, Copper, Silver, Gold, Zinc, Aluminum and Gallium.
Claim 6
Dependent Claim
12 words
The method of claim 4 wherein the metallic salt is ferric chloride.
Claim 7
Dependent Claim
38 words
The method of claim 1 wherein the chromogenic dye in the thermosensitive color-developing layer is reactive with the chemical reagent to form a permanent colorant product representative of the ridge pattern of the person's finger, palm or foot.
Claim 8
Dependent Claim
25 words
The method of claim 2 wherein the solution of chemical reagent comprises a mixture of ferric chloride, diethylene glycol, polyethylene glycol 200 and a surfactant.
Claim 9
Independent Claim
121 words
A method of recording fingerprints comprising: (a) providing a thermosensitive recording surface containing a thermosensitive color-developing layer, the layer comprising a chromogenic dye, an organic acid developer reactive with the dye to develop a color and a thermosensitive barrier for separating the acid and dye; (b) applying a solution of a chemical reagent containing one or more metallic salts to the fingerprint area of at least one finger of a person to be fingerprinted; (c) depositing the solution of the chemical reagent from the ridges of the fingerprint pattern area to said recording surface whereby the chemical reagent reacts with the organic acid or dye or both to provide a permanent colorant product representative of the ridge pattern of the finger.
Claim 10
Independent Claim
121 words
A method of recording fingerprints comprising: (a) providing a thermosensitive recording surface containing a thermosensitive color-developing layer, the layer comprising a chromogenic dye, an organic acid developer reactive with the dye to develop a color and a thermosensitive barrier for separating the acid and dye; (b) applying a solution of a chemical reagent containing one or more metallic salts to the fingerprint area of at least one finger of a person to be fingerprinted; (c) depositing the solution of the chemical reagent from the ridges of the fingerprint pattern area to said recording surface whereby the chemical reagent reacts with the organic acid or dye or both to provide a permanent colorant product representative of the ridge pattern of the finger.
Claim 11
Dependent Claim
14 words
The method of claim 8 wherein the organic acid consists of a phenolic compound.
Claim 12
Dependent Claim
12 words
The method of claim 9 wherein the phenolic compound is bisphenol A.
Claim 13
Dependent Claim
45 words
The method of claim 9 wherein the metallic salts are selected from the group consisting of the salts of Titanium, Zirconium, Hafnium, Vanadium, Niobium, Tantalum, Chromium, Molybdenum, Tungsten, Manganese, Rhenium, Iron, Ruthenium, Cobalt, Rhodium, Iridium, Nickel, Palladium, Platinum, Copper, Silver, Gold, Zinc, Aluminum and Gallium.
Claim 14
Dependent Claim
12 words
The method of claim 11 wherein the metallic salt is ferric chloride.
Claim 15
Dependent Claim
25 words
The method of claim 12 wherein the solution of chemical reagent comprises a mixture of ferric chloride, diethylene glycol, polyethylene glycol 200 and a surfactant.
Claim 16
Independent Claim
110 words
A method of making a permanent record of a desired object or symbol comprising: (a) providing a thermosensitive recording surface containing a thermosensitive color-developing layer, the layer comprising a chromogenic dye and an organic acid developer reactive with the dye to develop a color and a thermosensitive barrier for separating the acid and dye; and (b) applying a solution of a chemical reagent containing one or more metallic salts in the format of an image of the desired object or symbol to be recorded on the thermosensitive recording surface whereby the chemical reagent reacts with the organic acid to provide a permanent colorant product representative of the object or symbol.
Claim 17
Independent Claim
110 words
A method of making a permanent record of a desired object or symbol comprising: (a) providing a thermosensitive recording surface containing a thermosensitive color-developing layer, the layer comprising a chromogenic dye and an organic acid developer reactive with the dye to develop a color and a thermosensitive barrier for separating the acid and dye; and (b) applying a solution of a chemical reagent containing one or more metallic salts in the format of an image of the desired object or symbol to be recorded on the thermosensitive recording surface whereby the chemical reagent reacts with the organic acid to provide a permanent colorant product representative of the object or symbol.
Claim 18
Dependent Claim
14 words
The method of claim 14 wherein the developer includes one or more phenolic compounds.
Claim 19
Dependent Claim
13 words
The method of claim 15 wherein the developer is comprised of bisphenol A.
Claim 20
Dependent Claim
45 words
The method of claim 14 wherein the metallic salts are selected from the group consisting of the salts of Titanium, Zirconium, Hafnium, Vanadium, Niobium, Tantalum, Chromium, Molybdenum, Tungsten, Manganese, Rhenium, Iron, Ruthenium, Cobalt, Rhodium, Iridium, Nickel, Palladium, Platinum, Copper, Silver, Gold, Zinc, Aluminum and Gallium.
Claim 21
Dependent Claim
12 words
The method of claim 17 wherein the metallic salt is ferric chloride.
Claim 22
Dependent Claim
32 words
The method of claim 14 wherein the chromogenic dye in the thermosensitive color-developing layer is reactive with the chemical reagent to form a permanent colorant product representative of the object or symbol.
Claim 23
Dependent Claim
25 words
The method of claim 15 wherein the solution of chemical reagent comprises a mixture of ferric chloride, diethylene glycol, polyethylene glycol 200 and a surfactant.
Claim 24
Independent Claim
98 words
A method of making a permanent two-dimensional record of a desired object or symbol comprising: (a) providing a paper containing a uniform layer of a chromogenic dye, an organic acid developer reactive with the dye to develop a color and a thermosensitive barrier separating the acid and dye; and (b) applying a solution of a metallic salt in the format of an image of the desired object or symbol on the paper whereby the metallic salt solution reacts with the organic acid or dye or both to provide a permanent colorant product representative of the object or symbol.
Claim 25
Independent Claim
98 words
A method of making a permanent two-dimensional record of a desired object or symbol comprising: (a) providing a paper containing a uniform layer of a chromogenic dye, an organic acid developer reactive with the dye to develop a color and a thermosensitive barrier separating the acid and dye; and (b) applying a solution of a metallic salt in the format of an image of the desired object or symbol on the paper whereby the metallic salt solution reacts with the organic acid or dye or both to provide a permanent colorant product representative of the object or symbol.
Claim 26
Dependent Claim
45 words
The method of claim 21 wherein the metallic salt is selected from the group consisting of the salts of Titanium, Zirconium, Hafnium, Vanadium, Niobium, Tantalum, Chromium, Molybdenum, Tungsten, Manganese, Rhenium, Iron, Ruthenium, Cobalt, Rhodium, Iridium, Nickel, Palladium, Platinum, Copper, Silver, Gold, Zinc, Aluminum and Galluim.
Claim 27
Dependent Claim
12 words
The method of claim 21 wherein the metallic salt is ferric chloride.
Claim 28
Dependent Claim
25 words
The method of claim 21 wherein the solution of metallic salt comprises a mixture of ferric chloride, diethylene glycol, polyethylene glycol 200 and a surfactant.
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