A grass protecting walkway having a substantially flat elongated grid-like structure which defines a plurality of polygonal apertures is disclosed. The grid allocates its bottom and top planar surface areas approximately equally between the surface area of the apertures and the surface area of structured cross members.
申请公布号
US4596731(A)
申请公布日期
1986.06.24
申请号
US19840651236
申请日期
1984.09.17
申请人
CUDMORE, WARNER J. G.;VILVEN, DOUG O.;CUDMORE, H. KEITH
发明人
CUDMORE, WARNER J. G.;VILVEN, DOUG O.;CUDMORE, H. KEITH