Security marking fluid device

Details Security marking fluid device Security marking fluid device

1987-01-28

1988-10-18

Yasich, Daniel M.

Signals and indicators

Indicators

By location

116212, 116206, 285 93, 411 13, F16B 3106, F16L 5500

Patent

active

047779012

ABSTRACT:
A security device for preventing or indicating the tampering with a joint in a supply pipe, e.g. to a gas meter, comprises two or more members which fit together around the joint. The members have mutually interdigitating parts through which a blind bore is provided and which houses a glass phial containing a dye. Displacement of the members from the assembled configuration breaks the phial, thereby releasing the dye which stains the members so that the tampering is readily detectable.

REFERENCES:
patent: 2506806 (1950-05-01), Metzger
patent: 2572940 (1951-10-01), Lockhart
patent: 2601840 (1952-07-01), Smith et al.
patent: 3463532 (1969-08-01), Chidley et al.
patent: 3799108 (1974-03-01), Moscow
patent: 3964299 (1976-06-01), Johnson
patent: 4175813 (1979-11-01), Mentesana
patent: 4229813 (1980-10-01), Lilly et al.
patent: 4432462 (1984-02-01), Newkirk

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