Patent US4176205A successfully refreshed from Google Patents.
US4176205A
Expired / Lapsed
US
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Fingerprint powder and method of application
Assignee: Boeing North American Inc
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Filing: 1976-03-24
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Granted: 1979-11-27
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Expires: 1996-03-24
Abstract
Abstract Fingerprint powder and method for developing latent fingerprints therewith, such powder comprised of a powder carrier, especially a mixture of silica and talc, containing a coloring agent, preferably a fluorescent dye. The fingerprint powder can be applied by blowing the powder over a surface containing latent fingerprints, or by brushing or pouring the powder on such surface, or by immersion thereof in such powder, thus developing and revealing a bright, sharp fingerprint, which can be photographed or lifted by applying tape or a strippable coating over the print.
Inventors
- 👤 Orlando G. Molina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:53
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/117; A61B5/1171; A61B5/1172
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
80 words
A method for detecting or developing a latent fingerprint on a surface, which comprises applying to said surface a composition comprising a carrier powder selected from the group consisting of talc and silica, and mixtures thereof, and a coloring agent capable of forming a colored pattern of the fingerprint in conjunction with said carrier powder, said coloring agent being a fluorescent dye, and viewing said surface containing the developed fingerprint under lighting conditions to obtain a colored fluorescent fingerprint pattern.
Claim 2
Independent Claim
80 words
A method for detecting or developing a latent fingerprint on a surface, which comprises applying to said surface a composition comprising a carrier powder selected from the group consisting of talc and silica, and mixtures thereof, and a coloring agent capable of forming a colored pattern of the fingerprint in conjunction with said carrier powder, said coloring agent being a fluorescent dye, and viewing said surface containing the developed fingerprint under lighting conditions to obtain a colored fluorescent fingerprint pattern.
Claim 3
Dependent Claim
14 words
A method as defined in claim 1, said dye being a fluorescent naphthalimide dye.
Claim 4
Dependent Claim
51 words
A method as defined in claim 2, said carrier powder consisting essentially of a mixture of about 25 to about 50% talc and about 25 to about 60% silica, and said coloring agent being present in an amount ranging from about 10 to about 50%, by weight of the total composition.
Claim 5
Dependent Claim
37 words
A method as defined in claim 1, said fluorescent dye selected from the group consisting of Morton Fluorescent Yellow G, Color Index 75, and Calcofluor White RW, Color Index - Fluorescent brightening agent 68, and mixtures thereof.
Claim 6
Dependent Claim
52 words
A method as defined in claim 4, said carrier powder consisting essentially of a mixture ranging from about 5 to about 60% talc and about 15 to about 75% silica, and said coloring agent being present in an amount ranging from about 5 to about 75%, by weight of the total composition.
Claim 7
Dependent Claim
52 words
A method as defined in claim 1, said carrier powder consisting essentially of a mixture ranging from about 5 to about 60% talc, and about 15 to about 75% silica, and said coloring agent being present in an amount ranging from about 5 to about 75%, by weight of the total composition.
Claim 8
Dependent Claim
47 words
A method as defined in claim 6, including applying tape or a strippable coating to the developed fingerprint and lifting said tape or stripping said coating containing said developed fingerprint from said surface, including photographing the developed fingerprint on said lifted tape or on said stripped coating.
Claim 9
Independent Claim
122 words
A method for detecting or developing a latent fingerprint on a surface, which comprises applying to said surface a composition comprising a carrier powder and a coloring agent capable of forming a colored pattern of the fingerprint in conjunction with said carrier powder, said coloring agent being selected from the group consisting of fluorescent and non-fluorescent dyes and pigments, said carrier powder consisting essentially of a mixture ranging from about 5 to about 60% talc and about 15 to about 75% silica, and said coloring agent being present in an amount ranging from about 5 to about 75%, by weight of the total composition, and viewing said surface containing the developed fingerprint under lighting conditions to obtain a visible colored fingerprint pattern.
Claim 10
Independent Claim
122 words
A method for detecting or developing a latent fingerprint on a surface, which comprises applying to said surface a composition comprising a carrier powder and a coloring agent capable of forming a colored pattern of the fingerprint in conjunction with said carrier powder, said coloring agent being selected from the group consisting of fluorescent and non-fluorescent dyes and pigments, said carrier powder consisting essentially of a mixture ranging from about 5 to about 60% talc and about 15 to about 75% silica, and said coloring agent being present in an amount ranging from about 5 to about 75%, by weight of the total composition, and viewing said surface containing the developed fingerprint under lighting conditions to obtain a visible colored fingerprint pattern.
Claim 11
Dependent Claim
51 words
A method as defined in claim 8, said carrier powder consisting essentially of a mixture of about 25 to about 50% talc and about 25 to about 60% silica, and said coloring agent being present in an amount ranging from about 10 to about 50%, by weight of the total composition.
Claim 12
Dependent Claim
57 words
A fingerprint developing powder composition consisting essentially of talc in an amount ranging from about 5 to about 60%, silica in an amount ranging from about 15 to about 75%, and a coloring agent selected from the group consisting of fluorescent and non-fluorescent dyes and pigments, in amount ranging from about 5 to about 75%, by weight.
Claim 13
Dependent Claim
57 words
A fingerprint developing powder composition consisting essentially of talc in an amount ranging from about 5 to about 60%, silica in an amount ranging from about 15 to about 75%, and a coloring agent selected from the group consisting of fluorescent and non-fluorescent dyes and pigments, in amount ranging from about 5 to about 75%, by weight.
Claim 14
Dependent Claim
48 words
A composition as defined in claim 10, consisting essentially of talc in an amount ranging from about 25 to about 50%, silica in an amount ranging from about 25 to about 60%, and a coloring agent in an amount ranging from about 10 to about 50%, by weight.
Claim 15
Dependent Claim
15 words
A composition as defined in claim 11, wherein said coloring agent is a fluorescent dye.
Claim 16
Dependent Claim
15 words
A composition as defined in claim 10, wherein said coloring agent is a fluorescent dye.
Claim 17
Dependent Claim
15 words
A composition as defined in claim 13, said fluorescent dye being a fluorescent naphthalimide dye.
Claim 18
Dependent Claim
38 words
A composition as defined in claim 13, said fluorescent dye being selected from the group consisting of Morton Fluorescent Yellow G, Color Index 75, and Calcofluor White RW, Color Index - Fluorescent brightening agent 68, and mixtures thereof.
Claim 19
Dependent Claim
48 words
A composition as defined in claim 15, consisting essentially of talc in an amount ranging from about 25 to about 50%, silica in an amount ranging from about 25 to about 60%, and a coloring agent in an amount ranging from about 10 to about 50%, by weight.
Claim 20
Dependent Claim
45 words
A composition as defined in claim 15, wherein the particle size of said talc ranges from about 15 to less than 1 micron, said silica being fumed silica of low bulk density and having a particle size ranging from about 0.007 to about 0.050 micron.
Claim 21
Dependent Claim
45 words
A composition as defined in claim 10, wherein the particle size of said talc ranges from about 15 to less than 1 micron, said silica being fumed silica of low bulk density and having a particle size ranging from about 0.007 to about 0.050 micron.
Claim 22
Dependent Claim
32 words
A composition as defined in claim 10, wherein said talc is a semi-tremolitic-acicular-platey in the form of a white powder of irregular particle sizes and shapes, leaving an almost invisible film deposit.
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) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |