In a dispenser of the kind used for dispensing a fluid by applying pressure on a container, a bag assembly is provided with a tubular pleated bag, a ribbed coating being formed over the bag by dipping. After the bag is selectively discharged causing the bag to collapse, the bag folds along the pleats...http://www.google.ca/patents/US4964540?utm_source=gb-gplus-sharePatent US4964540 - Pressurized fluid dispenser and method of making the same
