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
CA845691A
Inventor
D. Allred Victor
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.)
Marathon Oil Co
Wise Coal and Coke Co
Original Assignee
Marathon Oil Co
Wise Coal and Coke Co
Publication date
Application grantedgrantedCritical
Publication of CA845691ApublicationCriticalpatent/CA845691A/en