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:
Jun. 10, 1980
Filed:
Dec. 08, 1978
Egbert DeVries, Kettering, OH (US);
Quad Corporation, Highland Park, IL (US);
Abstract
A pressure relief valve includes a flexible sheet bonded, except for a series of adhesive-free areas and channels therebetween, to a container having one or more holes in communication with said adhesive-free areas. The adhesive, preferably pressure-sensitive adhesive, is printed on the sheet in a fashion which, when bonded to the container, forms the adhesive-free areas and channels. When a gas pressure, as for example, derived from food generated gases, builds up within the container, the force of the gas exerted on the flexible sheet causes the sheet to bulge, thereby forming a cavity over the adhesive-free area. The gas then seeps through any series of channels in communication with said cavity and is released to the atmosphere. After the internal gas pressure has been relieved, the flexible sheet returns to its original position (flush against the container) thereby preventing the ingress of atmospheric gases.