US4879134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fingerprinting compositions, systems and methods
Assignee: EPACOR Inc
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Filing: 1988-10-05
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Granted: 1989-11-07
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Expires: 2008-10-05
Abstract
Abstract A self-contained liquid composition for use in making fingerprints comprising the reaction product of at least one leuco or non-leuco chromogenic compound and at least one color-developing substance in a liquid vehicle that is a solvent for said chromogenic compound and reaction product and a solvent or dispersant for said color-developing substance. The method of fingerprinting and a fingerprinting system utilizing the liquid composition are also disclosed.
Inventors
- 👤 Anthony E. Vassiliades
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:44
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/117; A61B5/1171; A61B5/1172
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
72 words
A self-contained inkless liquid composition for use in making fingerprints comprising the reaction product of at least one leuco or non-leuco chromogenic compound and at least one color-developing substance, metallic ions, a compound capable of forming complexes of low stability in an alkaline medium with said metallic ions, and a liquid vehicle that is a solvent for said chromogenic compound and reaction product and a solvent or dispersant for said color-developing substance.
Claim 2
Dependent Claim
72 words
A self-contained inkless liquid composition for use in making fingerprints comprising the reaction product of at least one leuco or non-leuco chromogenic compound and at least one color-developing substance, metallic ions, a compound capable of forming complexes of low stability in an alkaline medium with said metallic ions, and a liquid vehicle that is a solvent for said chromogenic compound and reaction product and a solvent or dispersant for said color-developing substance.
Claim 3
Dependent Claim
20 words
The composition of claim 1 wherein said chromogenic compound is a leucodye and said color-developing substance is an electron-accepting substance.
Claim 4
Dependent Claim
22 words
The composition of claim 1 wherein said chromogenic compound is a non-leuco dye, oil-soluble dye and said solvent is an oleophilic solvent.
Claim 5
Dependent Claim
36 words
The composition of claim 2 wherein said electron-accepting substance is selected from acidic clays, low molecular weight phenol-aldehyde condensation products or their metal salts, derivatives of aromatic carboxlyic acids or their metal salts, or mixtures thereof.
Claim 6
Dependent Claim
37 words
A method of fingerprinting comprising applying to a member to be fingerprinted the liquid composition of claim 1, 2, or 3 and the applying the member to a substrate to transfer said liquid composition to said substrate.
Claim 7
Dependent Claim
20 words
The method of claim 5 wherein said liquid composition is impregnated in a means capable of releasably retaining said composition.
Claim 8
Dependent Claim
86 words
A fingerprinting system comprising means capable of releasably retaining a liquid and an inkless liquid composition releasably retained in said means, said liquid composition comprising the reaction product of at least one leuco or non-leuco chromogenic compound and at least one color-developing substance, metallic ions, a compound capable of forming complexes of low stability in an alkaline medium with said metallic ions, and a liquid vehicle that is a solvent for said chromogenic compound and reaction product and a solvent or dispersant for said color-developing substance.
Claim 9
Dependent Claim
86 words
A fingerprinting system comprising means capable of releasably retaining a liquid and an inkless liquid composition releasably retained in said means, said liquid composition comprising the reaction product of at least one leuco or non-leuco chromogenic compound and at least one color-developing substance, metallic ions, a compound capable of forming complexes of low stability in an alkaline medium with said metallic ions, and a liquid vehicle that is a solvent for said chromogenic compound and reaction product and a solvent or dispersant for said color-developing substance.
Claim 10
Dependent Claim
21 words
The system of claim 7 wherein said chromogenic compound is a leuco dye and said color-developing substance is an electron-accepting substance.
Claim 11
Dependent Claim
22 words
The system of claim 7 wherein said chromogenic compound is a non-leuco dye, oil-soluble dye and said solvent is an oleophilic solvent.
Claim 12
Dependent Claim
56 words
A self-contained inkless liquid composition for use in making fingerprints comprising the reaction product of at least one leuco or non-leuco chromogenic compound and at least one color-developing substance, metallic ions, ammonia, and a liquid vehicle that is a solvent for said chromogenic compound and reaction product and a solvent or dispersant for said color-developing substance.
Claim 13
Dependent Claim
56 words
A self-contained inkless liquid composition for use in making fingerprints comprising the reaction product of at least one leuco or non-leuco chromogenic compound and at least one color-developing substance, metallic ions, ammonia, and a liquid vehicle that is a solvent for said chromogenic compound and reaction product and a solvent or dispersant for said color-developing substance.
Claim 14
Dependent Claim
12 words
The composition of claim 10 including a synthetic latex in said composition.
Claim 15
Dependent Claim
69 words
A fingerprinting system comprising means capable of releasably retaining a liquid and an inkless liquid composition releasably retained in said means, said liquid composition comprising the reaction product of at least one leuco or non-leuco chromogenic compound at least one color-developing substance, metallic ions, ammonia, and a liquid vehicle that is a solvent for said chromogenic compound and reaction product and a solvent or dispersant for said color-developing substance.
Claim 16
Dependent Claim
69 words
A fingerprinting system comprising means capable of releasably retaining a liquid and an inkless liquid composition releasably retained in said means, said liquid composition comprising the reaction product of at least one leuco or non-leuco chromogenic compound at least one color-developing substance, metallic ions, ammonia, and a liquid vehicle that is a solvent for said chromogenic compound and reaction product and a solvent or dispersant for said color-developing substance.
Claim 17
Independent Claim
12 words
The system of claim I2 including a synthetic latex in said composition.
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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) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |