Assignee
HAMANA IRON WORKS CO
4 granted patents·29 citations·filing 1976–1987
Top patents by PatentIndex Score
4 records- 0150US4735071AApparatus for continuously producing tube having helical grooves in its inner surfaceHAMANA IRON WORKS CO·Filed 1987·Granted Apr 5, 1988·10 cites·5 claims
- 0250US4446688ADouble twisting machineHAMANA IRON WORKS CO·Filed 1982·Granted May 8, 1984·6 cites·5 claims
- 0343US4766751AApparatus for continuously producing tube having helical grooves in its inner surfaceHAMANA IRON WORKS CO·Filed 1987·Granted Aug 30, 1988·10 cites·8 claims
- 0431US4090742ABearing deviceHAMANA IRON WORKS CO·Filed 1976·Granted May 23, 1978·3 cites·12 claims
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