Waterproof laminate
Patent 4194041 Issued on March 18, 1980. Estimated Expiration Date: 
June 29, 1998. 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.
June 29, 1998. 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 2631290 3005728 3228821 3391049 3558417 3595732 3663266 3694301 3779855 Process for producing porous products InventorsAssigneeApplicationNo. 05/920275 filed on 06/29/1978US Classes:442/289, Fluorinated olefin polymer or copolymer sheet or film (e.g., TEFLONÂ, etc.)2/135, Waterproof2/164, Linings2/167, Materials2/69.5, Bag type2/82, Water resistant2/87, Waterproof264/127, Fluorocarbon resin428/315.5, Voids specified as micro428/316.6, Plural void-containing components428/422, Addition polymer is perhalogenated428/423.1, Of polyamidoester (polyurethane, polyisocyanate, polycarbamate, etc.)428/513, Monoethylenically unsaturated428/516, Monoolefin polymer428/523, Polymer of monoethylenically unsaturated hydrocarbon5/939, WITH MICROPOROUS MATERIAL73/38Porosity or permeabilityExaminersPrimary: Ansher, HaroldAttorney, Agent or FirmInternational ClassesD06N 3/14 (20060101)D06N 3/00 (20060101) D06N 3/18 (20060101) D06N 3/12 (20060101) AbstractA waterproof article for use in, for example, protective clothing. The article prevents liquid water from penetrating through to undergarments while at the same time permitting moisture vapor such as perspiration to pass out through the article. The article is thus both breathable and waterproof. The article is layered: a microporous hydrophobic outer layer which permits the passage of moisture vapor but resists penetration by liquid water at pressures up to about 345 Kn/m2 ; a hyrophilic inner layer permitting the transfer of moisture vapor but preventing surface tension lowering agents such as those contained in perspiration and/or body oils from reaching the hydrophobic layer.Other References
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