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
CA628861A
Inventor
J. Carroll Martin
Original Assignee
United States Steel Corp
Publication date
Application grantedgrantedCritical
Publication of CA628861ApublicationCriticalpatent/CA628861A/en