Plastic closure with structural thread formation

Details Plastic closure with structural thread formation Plastic closure with structural thread formation

1995-03-21

1996-08-06

Cronin, Stephen K.

Bottles and jars

Closures

Cap type

215252, 215307, 215349, B65D 4104

Patent

active

055425569

ABSTRACT:
An internal thread is formed on the inner peripheral surface of a skirt wall in a container closure of a plastic. The cross-sectional shape of the internal thread is defined by an upper side edge extending radially inwardly in an axially downwardly inclined manner, a lower side edge extending radially inwardly in an axially upwardly inclined manner, a front edge extending substantially vertically, two concave arcs, and two convex arcs.

REFERENCES:
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patent: 4497765 (1985-02-01), Wilde et al.
patent: 4674643 (1987-06-01), Wilde et al.
patent: 4978017 (1990-12-01), McBride
patent: 5205426 (1993-04-01), McBride et al.
patent: 5207341 (1993-05-01), Yeager
patent: 5257705 (1993-11-01), de Santana
patent: 5265747 (1993-11-01), Gregory et al.
patent: 5289931 (1994-03-01), Doi

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