US5009919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finger-printing systems & method
Assignee: EPACOR Inc
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Filing: 1989-03-08
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Granted: 1991-04-23
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Expires: 2009-03-08
Abstract
Abstract A fingerprinting system comprising means capable of releasably retaining a liquid and a liquid composition releasably retained in said means, said liquid composition comprising a leuco chromogenic compound and an oleophilic solvent therefor, and a substrate for receiving fingerprints associated therewith, said substrate being coated on at least a portion of one surface thereof with a color-developing substance capable of reacting with said chromogenic compound to produce a colored reaction product. The invention also comprises the method of fingerprinting utilizing such system.
Inventors
- 👤 Anthony E. Vassiliades
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:04
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
88 words
A fingerprinting system comprising means capable of releasably retaining a liquid and a liquid composition releasably retained in said means, said liquid composition consisting essentially of a leuco chromogenic compound and an oleophilic solvent therefor, a substrate for receiving fingerprints associated therewith, said substrate being coated on at least a portion of one surface thereof with a color-developing substance capable of reacting with said chromogenic compound to produce a colored reaction product; and polyvalent metallic ions in said liquid composition or on said substrate with said color-developing substance.
Claim 2
Dependent Claim
88 words
A fingerprinting system comprising means capable of releasably retaining a liquid and a liquid composition releasably retained in said means, said liquid composition consisting essentially of a leuco chromogenic compound and an oleophilic solvent therefor, a substrate for receiving fingerprints associated therewith, said substrate being coated on at least a portion of one surface thereof with a color-developing substance capable of reacting with said chromogenic compound to produce a colored reaction product; and polyvalent metallic ions in said liquid composition or on said substrate with said color-developing substance.
Claim 3
Dependent Claim
17 words
The system of claim 1 wherein said means is a fingerprint pad and said substrate is paper.
Claim 4
Dependent Claim
25 words
The system of claim 1 or 2 wherein said leuco chromogenic compound is a combination of leuco dyes capable of giving a true black print.
Claim 5
Dependent Claim
75 words
A fingerprinting system comprising means capable of releasably retaining a liquid and a liquid composition releasably retained in said means, said liquid composition consisting essentially of a leuco chromogenic compound, an oleophilic solvent therefore, and polyvalent metallic ions, and substrate for receiving fingerprints associated therewith, said substrate being coated on at least a portion of one surface thereof with a color-developing substance capable of reacting with said chromogenic compound to produce a colored reaction product.
Claim 6
Dependent Claim
75 words
A fingerprinting system comprising means capable of releasably retaining a liquid and a liquid composition releasably retained in said means, said liquid composition consisting essentially of a leuco chromogenic compound, an oleophilic solvent therefore, and polyvalent metallic ions, and substrate for receiving fingerprints associated therewith, said substrate being coated on at least a portion of one surface thereof with a color-developing substance capable of reacting with said chromogenic compound to produce a colored reaction product.
Claim 7
Dependent Claim
38 words
The system of claim 1 or 2, wherein said color-developing substance is selected from acidic clays, low molecular weight phenol-aldehyde condensation products or their metal salts, derivatives of aromatic carboxylic acids or their metal salts, or mixtures thereof.
Claim 8
Independent Claim
91 words
The method of fingerprinting comprising applying to a member to be fingerprinted a liquid composition consisting essentially of a leuco chromogenic compound and an oleophilic solvent therefor and applying the member to be fingerprinted to a substrate coated at least in the portion thereof to which the member is applied with a color-developing substance capable of reacting with said leuco chromogenic compound to produce a colored reaction product which is a print of the member; and polyvalent metallic ions in said liquid composition or on said substrate with said color-developing substance.
Claim 9
Independent Claim
91 words
The method of fingerprinting comprising applying to a member to be fingerprinted a liquid composition consisting essentially of a leuco chromogenic compound and an oleophilic solvent therefor and applying the member to be fingerprinted to a substrate coated at least in the portion thereof to which the member is applied with a color-developing substance capable of reacting with said leuco chromogenic compound to produce a colored reaction product which is a print of the member; and polyvalent metallic ions in said liquid composition or on said substrate with said color-developing substance.
Claim 10
Dependent Claim
23 words
The method of claim 6 wherein the leuco chromogenic compound is a combination of leuco dyes capable of giving a true black print.
Claim 11
Independent Claim
78 words
The method of fingerprinting comprising applying to a member to be fingerprinted a liquid composition consisting essentially of a leuco chromogenic compound, an oleophilic solvent therefor, and polyvalent metallic ions, and applying the member to be fingerprinted to a substrate coated at least in the portion thereof to which the member is applied with a color-developing substance capable of reacting the said leuco chromogenic compound to product a colored reaction product which is a print of the member.
Claim 12
Independent Claim
78 words
The method of fingerprinting comprising applying to a member to be fingerprinted a liquid composition consisting essentially of a leuco chromogenic compound, an oleophilic solvent therefor, and polyvalent metallic ions, and applying the member to be fingerprinted to a substrate coated at least in the portion thereof to which the member is applied with a color-developing substance capable of reacting the said leuco chromogenic compound to product a colored reaction product which is a print of the member.
Claim 13
Dependent Claim
17 words
The system of claim 4 wherein said means is a fingerprint pad and said substrate is paper.
Claim 14
Dependent Claim
23 words
The method of claim 8 wherein the leuco chromogenic compound is a combination of leuco dyes capable of giving a true black print.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-22 | 1994-10-22 | 1995-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-22 | 1998-10-22 | 1999-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-22 | 2002-10-22 | 2003-04-23 | $7700.00 | Window Closed / Lapsed |