TODAY’S PATENT – WATERPROOF FOOTWEAR
The WATERPROOF FOOTWEAR was invented by Walter Bleimhofer (Penzberg), Thorger Hubner (Kolbermoor) on 13th February 1990, bearing the patent number US4899465A.
This invention relates to improved footwear that can be used in rain or work in or near water as well as being comfortable by allowing for evaporation of sweat.
Footwear consisting of an insole, an upper sewn to the insole, a lining for lining the upper which is also sewn to the insole and has microporous functional layer that is waterproof and permeable to water vapor, and a waterproof plastic sole which is injection-molded to the bottom side of the insole and the lower portion of the upper and encloses the seam region. The lower portion of the upper which is adjacent to the insole is formed by a porous material that is adapted to be penetrated by the plastic sole material which is liquid during the injection molding operation.