Inventor
CHILD JR JAMES L
4 patents
Patents
4 patentsUS4523613AJun 18, 1985
Multi-layered corrugated conduit with "black-eye" like apertures
HANCOR INC122 citations95
US4360042ANov 23, 1982
Arched conduit with improved corrugations
HANCOR INC72 citations95
US4245924AJan 20, 1981
Arch conduit
HANCOR INC87 citations95
US4374079AFeb 15, 1983
Method and apparatus for manufacturing expanded and layered semiround plastic tubings
HANCOR INC22 citations81