Synthetic resin corrugated pipe having a concave-convex surface
摘要
A synthetic resin corrugated pipe includes a pipe wall having an annularly- or helically-shaped convex-concave surface. The convex-concave surface has a plurality of convex portions having a quadrangular cross-sectional shape and a plurality of concave portions having a circular cross-sectional shape.
申请公布号
US5799703(A)
申请公布日期
1998.09.01
申请号
US19960600595
申请日期
1996.02.13
申请人
KANAO, DECEASED, SHIRO;KANAO, HEIR, BY CHIZUKO;KANAO, HEIR, BY SHIGEKI
发明人
KANAO, DECEASED, SHIRO;KANAO, HEIR, BY CHIZUKO;KANAO, HEIR, BY SHIGEKI