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US 3,970,241 AGranted
Flat bottom bag
OwnerViolet M. Hansoninventor
Life of this patent
Estimating the term…
Abstract
The invention relates to a flat bottom plastic bag and to methods of forming the same in which the bag is provided with an initial closed bottom that is further sealed between the bottom and the sides to produce a double-sealed, double-thickness closure.
Claims9
As an article of manufacture,
- a double-sealed flat bottom bag of heat sealable material comprising a seam heat sealing closed the bag bottom and defining opposite inwardly gusseted sides,
- said inwardly gusseted sides being sealed to the bag bottom by said sealing seam for automatically forming flaps in overlying relationship with said closed bottom when the bag bottom is pressed flat,
- and said overlying flaps and closed bottom being heat sealed together in their flat overlying relationship by further sealing means extending across the width of the bag and said flaps.
A double-sealed flat bottom bag of heat sealable material comprising opposed faces and opposed sides,
- a seam heat sealing closed the opposed faces together at the bottom with said opposed sides gusseted inward and heat sealed therebetween,
- further heat sealing means joining together preselected adjacent portions of said faces and sides for the width of said bag when the bottom of the bag is pressed flat and said faces and sides are positioned in adjacent overlying relationship.
Dependencies are inferred from the claim text.