Bottles and jars – Closures – Including visual indicia
Patent
1983-12-07
1985-05-28
Pollard, Steven M.
Bottles and jars
Closures
Including visual indicia
B65D 5502
Patent
active
045195153
ABSTRACT:
An indicator arrangement for a tamper-evident container lid. A disc seated atop the open neck of the container is coated at its top surface with microcapsules filled with a dye which changes color upon exposure to air, when the capsules are ruptured. The underside of the lid over the container carries an abrasive which ruptures the capsules when the lid is rotated with respect to the disc. The lid permits viewing of the indication through the lid. The disc is of an extruded, expanded polystyrene foam which resiliently deforms to press the indicator capsules against the abrasive in the lid and which compensates for manufacturing tolerances in the container, lid and disc. The annular periphery of the disc is permanently compressed to define a stiffer ridigidying support for the disc, which prevents the disc from deforming under the pressure applied thereto by the underside of the lid.
REFERENCES:
patent: 2131774 (1938-10-01), Waring
patent: 2131775 (1938-10-01), Waring
patent: 2939597 (1960-06-01), Greene
patent: 3896965 (1975-07-01), Cornell
patent: 3923198 (1975-12-01), Brochman
patent: 4197947 (1980-04-01), Zaidi
patent: 4266687 (1981-05-01), Cummings
patent: 4424911 (1984-01-01), Resnick
patent: 4446979 (1984-05-01), Gach et al.
patent: 4475661 (1984-10-01), Griffin
patent: 4480760 (1984-11-01), Schonberger
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