Taking of finger prints

Details Taking of finger prints Taking of finger prints

1979-02-28

1981-03-24

Smith, Ronald H.

Coating processes

Body member printing

427 7, 427 13, 427 141, 427 27, 427145, 427155, 427167, 427421, 4274301, 430 48, 430 55, 430117, 430121, A61B 510

Patent

active

042580730

ABSTRACT:
A first method of revealing a fingerprint involves the charging of the surface bearing the fingerprint to a high electric potential and applying finely divided carbon to the charged surface to form a pattern thereon corresponding to the fingerprint.
The finely divided carbon may be dusted or sprayed on or may be in suspension in a dielectric liquid into which the charged surface is introduced.
In another method the surface is charged while submerged in the dielectric liquid, under the action of an electric field in the dielectric.
In another method an electrically charged sheet is brought into contact with a surface bearing a fingerprint and after being removed, the charged sheet has applied to its surface finely divided carbon which adheres thereto depending on the charge pattern remaining thereon after contact with the fingerprint.
The pattern of finely divided carbon can be fixed in position by applying thereover a transparent protective layer.

REFERENCES:
patent: 2986831 (1961-06-01), Terck et al.
patent: 3010842 (1961-11-01), Ricker
patent: 3408217 (1968-10-01), Obuchi
patent: 3492140 (1970-01-01), Honjo
patent: 3549253 (1970-12-01), Brodie
patent: 3549397 (1970-12-01), McDonald et al.

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