发明名称 Well cover and method of making
摘要 A well cover includes a housing having a top side and a substantially concave bottom side, and a peripheral base portion. A substantially radially outwardly extending flange is disposed on the peripheral base portion for securing the well cover to the ground. Alternatively, a plurality of tabs may be provided for securing the well cover to the ground. The flange or tabs may be provided with holes or slots therethrough. Attachment anchors cooperate with the flange or tabs to releasably secure the well cover to the ground. A method of forming the well cover includes vacuum molding a sheet of vacuum-moldable material into a desired contour. The flange or tabs are formed integrally with the housing.
申请公布号 US6131654(A) 申请公布日期 2000.10.17
申请号 US19980126048 申请日期 1998.07.30
申请人 HOLSCHER, MORRIS 发明人 HOLSCHER, MORRIS
分类号 E21B33/02;(IPC1-7):E21B33/00 主分类号 E21B33/02
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