Inkless fingerprinting device and method adapted for recordation

Details Inkless fingerprinting device and method adapted for recordation Inkless fingerprinting device and method adapted for recordation

1978-12-11

1981-04-21

Smith, Ronald H.

Coating apparatus

Body member printing type

118264, 118265, 118715, 427 1, 427145, 4272554, B41K 100

Patent

active

042626234

ABSTRACT:
A plurality of fingerprints of a person are recorded by applying a solution of a first substantially colorless chemical reagent to the fingertips. Essentially invisible fingerprints are obtained by gently pressing the fingers having the solution of the first chemical reagent thereon on a suitable recording sheet. Subsequently the recording sheet is exposed to sublimed vapors of a second chemical reagent. The first and second chemical reagents are selected to react with one another to yield a highly colored substance which is formed on the surface of the recording sheet providing a visible image of the fingerprints. Ferric chloride and a 8-hydroxyquinoline are ideally suited chemical reagents for use in this invention. An apparatus of unitary construction incorporating a replaceable dispensing pad having the solution of the first chemical, is disclosed. The apparatus also includes a suitable bracket for holding the recording sheet and a chamber wherein the exposure of the latent fingerprint to the sublimed vapors of the second chemical reagent occurs.

REFERENCES:
patent: 2235632 (1941-03-01), Heinecke
patent: 2723476 (1955-11-01), Lyon
patent: 3851619 (1974-12-01), Cofield
patent: 3960632 (1976-06-01), Gaines et al.
patent: 4029012 (1977-06-01), Smith
patent: 4030934 (1977-06-01), Iijima

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