Hisakazu Kawashima

Follow

Person

Kobe, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Oil well pipe joint and manufacturing method therefor
- Patent number 4,871,194
- Issue date Oct 3, 1989
- Sumitomo Metal Industries, Ltd.
- Hisakazu Kawashima
- E21 - EARTH DRILLING MINING
Information Patent Grant
Oil well pipe joint
- Patent number 4,630,849
- Issue date Dec 23, 1986
- Sumitomo Metal Industries, Ltd.
- Kunihiro Fukui
- E21 - EARTH DRILLING MINING
Information Patent Grant
Oil well casing and tubing joint and production of same
- Patent number 4,474,651
- Issue date Oct 2, 1984
- Sumitomo Metal Industries, Ltd.
- Akihiro Yauchi
- C25 - ELECTROLYTIC OR ELECTROPHORETIC PROCESSES APPARATUS THEREFOR