P

Inventor

OTANI KOUJI

JP5 patents
⚠️ This page may combine multiple inventors who share the name “OTANI KOUJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

HITACHI LTD

3 patents
US4028237AJun 7, 1977

Method and apparatus for treatment of fluorine-containing waste waters

HITACHI LTD35 citations90
US4220858ASep 2, 1980

Apparatus for detecting change in water quality

HITACHI LTD24 citations81
US4085194AApr 18, 1978

Waste flue gas desulfurizing method

HITACHI LTD26 citations81

HITACHI CONSTRUCTION MACH CO

1 patent
US12444245B2Oct 14, 2025

Mine management system

HITACHI CONSTRUCTION MACH CO0 citations59

BABCOCK HITACHI KK

1 patent
US4154673AMay 15, 1979

Method of treatment of waste water containing sulfur compounds

BABCOCK HITACHI KK5 citations59