Depositing latent fingerprints and development thereof

Details Depositing latent fingerprints and development thereof Depositing latent fingerprints and development thereof

1979-07-23

1981-03-31

Smith, Ronald H.

Coating apparatus

Body member printing type

118264, 427 1, B05B 706

Patent

active

042586445

ABSTRACT:
Latent fingerprints having a latency of several weeks are applied to paper substrates using compositions comprising trimeric aliphatic acids of at least 30 carbon atoms which are substantive to paper fibers are substantially non-volatile, and are non-hardening, non-toxic and non-hygroscopic. The latent fingerprints are developed as desired by dusting in the conventional manner with toner particles, suitably, comprising magnetic particles in oleophilic matrix.

REFERENCES:
patent: 2334850 (1943-11-01), Traylor
patent: 2341239 (1944-02-01), Percy et al.
patent: 3239545 (1963-03-01), Rogler
patent: 3251869 (1966-05-01), Putnam
patent: 3377286 (1968-04-01), Stricklin
patent: 3639245 (1972-02-01), Nelson
patent: 3776865 (1973-02-01), Glaser et al.
patent: 3823022 (1974-07-01), Thomas
patent: 4069235 (1978-01-01), Suzuki
Research Disclosure-Jul. 1973.
Kirk-Othmer, Encyclopedia of Chemical Technology, 2nd ed., vol. 8, pp. 847-849, 1965.

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