Waterproof shoe construction and manufacture
Patent 4819345 Issued on April 11, 1989. Estimated Expiration Date: 
February 29, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 29, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2883316 3350795 Flexible layered product Waterproof shoe construction Patent #: 4599810 InventorsAssigneeApplicationNo. 07/161885 filed on 02/29/1988US Classes:36/17R, Welt connected36/12, SOLE-ATTACHING MEANS36/55LiningsExaminersPrimary: Meyers, Steven N.Attorney, Agent or FirmInternational ClassesA43B 7/12 (20060101)A43B 7/00 (20060101) AbstractA waterproof shoe construction and its method of manufacture is disclosed. The shoe has a liner which is impervious to liquid water but pervious to water vapor, a first innersole and a second innersole with a rib. There is a film impervious to liquid water but pervious to water vapor cemented between the first and second innersoles. A horizontal stitch connects the shoe side panels and the rib of the second innersole between the walls of a channel-shaped welt top, which welt bottom is cemented to the top of an outersole. The method of manufacture is a special blend of stitch down and cement construction techniques which allows for a comfortable, waterproof shoe at a lower manufacturing cost.Other References
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