Envelopes – wrappers – and paperboard boxes – File folder or file envelope – Hanging type
Patent
1975-06-30
1977-01-04
Garbe, Stephen P.
Envelopes, wrappers, and paperboard boxes
File folder or file envelope
Hanging type
137859, 220209, 426118, B65D 3114
Patent
active
040008460
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.
REFERENCES:
patent: 2870954 (1959-01-01), Kulesza
patent: 3197119 (1965-07-01), Hartig et al.
patent: 3401719 (1968-09-01), Rosser
patent: 3424343 (1969-01-01), Hoeffelman
patent: 3595467 (1971-07-01), Goglio
Dunkin' Donuts Incorporated
Garbe Stephen P.
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