Title: Tamper-proof closure

Abstract: A new tamper-proof closure includes a cap having a plurality of circumferentially spaced slits separated by bridges with a plurality of lines of weakness extending perpendicular to the slits and aligned with the respective bridges. The lines of weakness have a residual thickness which varies between opposite ends.

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Inventors: George, Robert W. (Naperville, IL, US)

Application Number: 965430
Filing Date: 1978-12-01
Publication_date: 1980-08-19
Assignee: National Can Corporation (Chicago, IL)
Primary Class(es): 215/253 215/252, 215/258
Other Classes:
US Patent Ref:

3837519	Sep, 1974	Perry	215/252.
3861551	Jan, 1975	Hannon	215/252.

Other Refs:
Primary Examiner: Hall, George T.
Assistant Examiner:
Attorney: Stenzel; Robert A., Rath; Ralph R.