专利名称：Process for manufacturing a porous
drainage medium
发明人：Larry Yaw申请号：US10107986申请日：20020327公开号：US06805824B2公开日：20041019
专利附图：
摘要：In a process for making a porous drainage medium composed of entangledstrands of thermoplastic resin, subsequent to forming a tubular preform, the preform isformed with necked-down sections at intervals along the length thereof before
proceeding to a cooling tank. As such, the drainage medium can be flexed in the coolingtank and can be discharged continuously and conveniently out of the cooling tankwithout being cut.
申请人：YAW LARRY
代理机构：Frommer Lawrence & Haug LLP
代理人：Ronald R. Santucci
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