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
CA617841A
Inventor
M. Llewelyn David
H. West Dewitt
Original Assignee
Vale Canada Ltd
Publication date
Application grantedgrantedCritical
Publication of CA617841ApublicationCriticalpatent/CA617841A/en