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
CA621462A
Inventor
J. Erck Louis
C. Violetta Donald
E. Ban Thomas
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.)
Cleveland Cliffs Iron Co
Original Assignee
Cleveland Cliffs Iron Co
Publication date
Application grantedgrantedCritical
Publication of CA621462ApublicationCriticalpatent/CA621462A/en