Elongated bendable drainage mat
Patent 4572700 Issued on February 25, 1986. Estimated Expiration Date: 
March 31, 2003. 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.
March 31, 2003. 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 ReferencesInventorsApplicationNo. 06/480990 filed on 03/31/1983US Classes:404/35, Portable mat type210/486, Spaced wall type, e.g., hollow leaf404/66, Encased, laminated or composite405/45, Porous428/17, Flora428/86, Interlaminar428/95, Particular backing structure or composition52/169.5With drain or vent exterior to foundation perimeterExaminersPrimary: Novosad, Stephen J.Assistant: Letchford, John F. Attorney, Agent or FirmInternational ClassesE01C 13/00 (20060101)E01C 11/00 (20060101) E01C 13/08 (20060101) E01C 11/22 (20060101) E01F 5/00 (20060101) E01C 13/10 (20060101) E02B 11/00 (20060101) AbstractElongated, bendable drainage mat having a rectangular transverse cross section and comprising a polymeric core having a plurality of substantially rigid fingers extending from one side of a layer and an enveloping water permeable fabric having a permittivity from 0.2 seconds-1 to 2.0 seconds-1 and a dynamic permeability after 106 loadings of at least 10-4 centimeters per second.Apparatus and systems using such drainage mat.Other References
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