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US3851619A Expired / Lapsed US ⏱️ 0.0 years remaining

Fingerprint apparatus

Assignee: SCRIPTO-TOKAI Corp A CORP OF
•
Filing: 1972-06-14
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Granted: 1974-12-03
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Expires: 1992-06-14
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Abstract

Abstract Method and apparatus for inkless fingerprinting employing the steps of applying a reagent comprising an aromatic polyhydroxy compound having the structural formula R-Ar(OH)n wherein R is a radical selected from the group consisting of hydrogen, halogens, amides, carboxyl groups, and the n-propyl ester of a monocarboxylic acid; Ar is an aromatic selected from the group consisting of benzene and naphthalene; and n is a positive integer greater than 1, to the surface upon which the fingerprint is to be deposited, applying a ferric or vanadium salt developer to a fingertip and applying the developer-coated fingertip to the print surface. The reagent applicator includes an aerosol dispenser which is inserted into a positioning device for an application of a predetermined amount of reagent from a selected height to the print surface. Another embodiment of the reagent applicator includes a reservoir for the reagent and a porous nib in communication with the reservoir for delivering a controlled amount of reagent to the print surface. The developer applicator includes a rigid material having interconnecting voids which serves as a reservoir for the developer solution and an overlying, permeable membrane which is contacted by the fingertip.

Inventors

  • 👤 E Cofield
  • 👤 R Rowe

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 05:33
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/117; A61B5/1171; A61B5/1172

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 157 words
An apparatus for coating a predetermined amount of developer upon a surface portion of the human body upon contact theRewith, for producing an inkless print when said coated body portion is applied to a reagent coated surface, comprising a developer storing means which includes an element formed of a rigid material and having a substantially smooth face, and a membrane permeable to said developer, mounted adjacent to and overlying said face, said membrane and face being spaced a short distance apart to provide a uniform interfacial void which is sufficiently restricted to cause the developer to be attracted into said void, said developer being withdrawn through said membrane when said body portion is pressed upon said membrane, and transferred to the surface of said body portion, said withdrawn developer being replaced by developer attracted into said void from said storage means; and said membrane being of sufficient thinness to prevent it from acting as a storage reservoir.
Claim 2
Independent Claim 157 words
An apparatus for coating a predetermined amount of developer upon a surface portion of the human body upon contact theRewith, for producing an inkless print when said coated body portion is applied to a reagent coated surface, comprising a developer storing means which includes an element formed of a rigid material and having a substantially smooth face, and a membrane permeable to said developer, mounted adjacent to and overlying said face, said membrane and face being spaced a short distance apart to provide a uniform interfacial void which is sufficiently restricted to cause the developer to be attracted into said void, said developer being withdrawn through said membrane when said body portion is pressed upon said membrane, and transferred to the surface of said body portion, said withdrawn developer being replaced by developer attracted into said void from said storage means; and said membrane being of sufficient thinness to prevent it from acting as a storage reservoir.
Claim 3
Dependent Claim 25 words
An apparatus as in claim 1 wherein said storage means comprises a box like container and a rigid, porous member snugly received in said container.
Claim 4
Dependent Claim 17 words
An apparatus as claimed in claim 1 wherein said membrane thickness ranges from 0.002 to 0.010 inches.
Claim 5
Dependent Claim 17 words
An apparatus as claimed in claim 3 wherein the preferred thickness of said membrane is 0.003 inch.
Claim 6
Dependent Claim 21 words
An apparatus as claimed in claim 1 wherein said developer is selected from the group consisting of ferric and vanadium salts.
Claim 7
Dependent Claim 13 words
An apparatus as claimed in claim 1 wherein said developer comprises ferric choloride.

References Cited (Backward Citations)

US1539448A Cited
US2374198A Cited
US3172356A Cited
US3491683A Cited
US3416490A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-12-02 1978-06-03 1978-12-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-12-02 1982-06-03 1982-12-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-12-02 1986-06-03 1986-12-03 $7700.00 Window Closed / Lapsed

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