Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA869930A
Inventor
Ihara Seiichi
Akimoto Yumi
Shibasaki Takeyoshi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Metal Corp
Original Assignee
Mitsubishi Metal Corp
Publication date
Application grantedgrantedCritical
Publication of CA869930ApublicationCriticalpatent/CA869930A/en