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
CA605633A
Inventor
De V. Finch Harry
W. Hearne George
S. Lafrance Donald
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.)
Shell USA Inc
Original Assignee
Donald S Lafrance
Harry De V Finch
Shell Oil Co
Publication date
Application grantedgrantedCritical
Publication of CA605633ApublicationCriticalpatent/CA605633A/en