Asahi Glass Company, Limited

Kawasaki Steel Corporation

Kunio Takahashi

Noriyuki Oda

Akira Torao

Yuichiro Asano

Atsushi Momose

Motoji Shiozumi

Takayuki Yanagimoto

Nobuyuki Kido

Yoshihisa Kono

Susumu Moriya

Keizi Muramatsu

In one aspect of the invention, the sample surface is wetted with an aqueous solution of a fluorescent dye followed by rinses with water to remove an excessive amount of the dye so that the background fluorescence emission can be minimized to increase the efficiency of fingerprint detection. In another aspect, the fluorescent dye or a reagent to produce fluorescent substance is deposited on the sample surface by attaching a gelatin film impregnated with a solution thereof followed by peeling. In a further different aspect, a powdery fluorescent dye is deposited on to the sample surface followed by spraying of water after removing an excessive amount of the powdery dye so that the background fluorescence can be minimized. The invention also provides an apparatus for the fingerprint detection by the laser beam excitation of fluorescence, which is compact and portable as being composed of an ingenious combination of several units into an integral system.

Method for detecting fingerprints using a laser and an apparatus therefor

A sealing structure between at least one tube and a tube support plate having a hole for each tube to extend therethrough, characterized in that a ring member enclosing each tube with a space therefrom is secured to the tube support plate, a sand is filled in the space to form a cylindrical sand layer surrounding the tube, a means for preventing leakage of the sand is provided at each axial end of the sand layer.

Sand-filled sealing structure between at least one tube and a tube

Growing community of inventors

Chiba, Japan

Kunio Takahashi