Inventor · disambiguated record
Hisakazu Kawashima
Also filed as: KAWASHIMA HISAKAZU
3 granted patents·277 citations·filing 1982–1986
78Inventor score
Files withSUMITOMO METAL IND3
Top patents by PatentIndex Score
3 records- 0194US4630849AOil well pipe jointSUMITOMO METAL IND·Filed 1985·Granted Dec 23, 1986·185 cites·10 claims
- 0284US4474651AOil well casing and tubing joint and production of sameSUMITOMO METAL IND·Filed 1982·Granted Oct 2, 1984·56 cites·22 claims
- 0366US4871194AOil well pipe joint and manufacturing method thereforSUMITOMO METAL IND·Filed 1986·Granted Oct 3, 1989·36 cites·20 claims
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