The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 01, 1994
Filed:
May. 22, 1992
Robert J Heilman, Orland Park, IL (US);
Daniel M Carson, New York, NY (US);
Robert E Sparks, St. Louis, MO (US);
Norbert S Mason, St. Louis, MO (US);
Continental White Cap, Inc., Downers Grove, IL (US);
Abstract
This relates to the provision of a vacuum actuated button type closure with a tamper indicating arrangement which will visually indicate when a container has been opened or more particularly when the vacuum within a vacuum packed container has been lost. The deflectable button of the closure is utilized to squeeze a dye from a sponge like member into a layer of absorbent material so as to color the absorbent material. The absorbent material, in turn, is provided with non-absorbent areas which define indicia to indicate that an associated container has been opened. The layer of absorbent material is carried by an arched cross sectional cover and in several forms of the cover, a central portion of the cover is downwardly deformable under pressure to move the layer of absorbent material from an inoperative position to a lowered position for cooperation with the sponge like member when the button returns to its up position to effect the flow of the dye from the sponge like member into the layer of absorbent material.