Laminate suitable as hydrocarbon resistant pond liner
Patent 4035543 Issued on July 12, 1977. Estimated Expiration Date: 
July 12, 1994. 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.
July 12, 1994. 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 2949394 3282771 3474625 3576687 3666585 3676242 InventorsAssigneeApplicationNo. 05/573487 filed on 05/01/1975US Classes:442/261, At least one layer is a preformed synthetic polymeric film or sheet405/270, Impermeabilization428/515, Next to second addition polymer from unsaturated monomers442/290, Olefin polymer or copolymer sheet or film (e.g., polypropylene, polyethylene, ethylene-butylene copolymer, etc.)442/392, Multiple nonwoven fabric layers composed of the same polymeric strand or fiber material442/398Olefin polymer or copolymer sheet or film (e.g., polypropylene, polyethylene, ethylene-butylene copolymer, etc.)ExaminersPrimary: Bell, James J.AbstractA laminate is provided having sufficient strength and hydrocarbon resistance to be used as a pond liner. The laminate has at least one cohesive batt of polypropylene fiber having a weight of about 100 g/m2 to about 250 g/m2 heat bonded to at least one polyethylene film having a thickness of about 10 to about 50 mils and a density of about 0.905 to about 0.925 g/cc.Other References
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