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
CA890851A
Inventor
Kowaka Masamichi
Fujikawa Hisao
Nagata Saburo
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.)
Nippon Steel Corp
Original Assignee
Hisao Fujikawa
Masamichi Kowaka
Saburo Nagata
Sumitomo Metal Industries Ltd
Publication date
Application grantedgrantedCritical
Publication of CA890851ApublicationCriticalpatent/CA890851A/en