Lined cavity in the earth
Patent 4239416 Issued on December 16, 1980. Estimated Expiration Date: 
September 15, 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.
September 15, 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 2361743 2372187 2413243 2508906 3068561 3562987 InventorsAssigneeApplicationNo. 05/942592 filed on 09/15/1978US Classes:405/53, Fluid storage in earthen cavity220/62.21, Bag liner405/55Cavity constructionExaminersPrimary: Taylor, Dennis L.Attorney, Agent or FirmInternational ClassesB65G 5/00 (20060101)E21F 17/00 (20060101) E21F 17/16 (20060101) E21D 11/14 (20060101) E21D 11/38 (20060101) E21D 11/15 (20060101) Foreign Application Priority Data1977-09-19 ITAbstractA cavity in the earth such as a reservoir, tunnel or the like is lined with a flexible, fluid impervious sheet such as a rubberized fabric supported by a grid-like skeleton structure having distorted elongated resilient structural members which are under tension and press the liner against the walls of the cavity. The members of the skeleton structure are made of a material which resists permanent distortion. The liner is disposed between the skeleton structures and the wall of the cavity and is fastened at spaced points to the wall of the cavity. | |
