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:
Jan. 04, 1977
Filed:
Jun. 30, 1975
Seymour Gilbert, Piscataway, NJ (US);
Dunkin' Donuts Incorporated, Randolph, MA (US);
Abstract
A highly improved pressure relief valve permitting release of pressure from an enclosed area without permitting any substantial reverse flow of gases or fluids into that enclosed area is disclosed. Specifically, the pressure relief valve includes a rigid base member, preferably composed of a rigid plastic material such as polyvinyl chloride, a flexible valve membrane stretched across the surface of the base member, the flexible valve membrane preferably composed of a synthetic resin material, and an entrance port associated with one end of the base member so that pressure build-up in the enclosed area is released between the base member and the flexible valve membrane when it reaches a predetermined level. Furthermore, a coffee bag for storing roasted coffee beans and ground coffee is disclosed, including the above-described pressure relief valve for permitting the release of CO.sub.2 from the bag while at the same time preventing the entrance of any substantial amounts of O.sub.2 into the bag.