Security seal

Details Security seal Security seal

1980-07-03

1982-04-27

Ward, Jr., Robert S.

Closure fasteners

Seals

Encasing

70232, 411371, 411910, B65D 5502, F16B 4100

Patent

active

043267408

ABSTRACT:
A seal for a pipe coupling such as is used to connect a gas meter to a gas supply line. The seal is made in two portions, which may be connected by a flexible web, and the portions have integral means for locking together around the nut of a coupling. Each portion has an outer shell with internal protrusions formed on the inner surface thereof. The portions are made of pigmented plastic of a type, such as polypropylene, that forms a white blush on the surface when permanently deformed. Hence when an attempt is made to remove the seal by a wrench or the like, the internal protrusions are forced against the nut, forming white blushes on the outer surface opposite the position of the ribs, giving visual evidence of tampering.

REFERENCES:
patent: 1154960 (1915-09-01), Baruch
patent: 1855931 (1932-04-01), Washburn
patent: 1870040 (1932-08-01), Dietze
patent: 2318590 (1943-05-01), Boynton
patent: 2322347 (1943-06-01), Churchman
patent: 3284121 (1966-11-01), Lyon
patent: 3298272 (1967-01-01), Henderson
patent: 3428337 (1969-02-01), Read
patent: 4068555 (1978-01-01), Volkman
patent: 4137816 (1979-02-01), Gartner

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