Inkless fingerprinting device and method adapted for recordation of a plurality of fingerprints
US4262623A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1978 |
| Grant date | Apr 21, 1981 |
| Priority date | — |
| Expiry date | Dec 11, 1998 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/1172
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.