Inventor
MURAI SADAO
3 patents
Patents
3 patentsUS4107249AAug 15, 1978
Method for forming an annular groove in a thermoplastic pipe
SEIKISUI CHEMICAL CO LTD84 citations92
US4036930AJul 19, 1977
Method of manufacturing resin tubes alternately having a thick wall portion and a thin wall portion
SEIKISUI CHEMICAL CO LTD15 citations70
US4135871AJan 23, 1979
Apparatus for manufacturing resin tubes alternately having a thick wall portion and a thin wall portion
SEIKISUI CHEMICAL CO LTD3 citations59