Inventor

OHTSUGA HISAO

JP3 patents

⚠️ This page may combine multiple inventors who share the name “OHTSUGA HISAO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

TOKYO GAS CO LTD

2 patents

US4427480AJan 24, 1984

Method and apparatus for providing the inner surface of a pipe line with a tubular lining material

TOKYO GAS CO LTD61 citations94

US4684556AAug 4, 1987

Tubular lining material for pipe line

TOKYO GAS CO LTD41 citations90

OHTSUGA HISAO

1 patent

US4346922AAug 31, 1982

Device for preventing leakage at pipe joints

OHTSUGA HISAO67 citations88