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
CA677775A
Inventor
W. Klinkenberg Jan
Van Zoonen Dick
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
Dick Van Zoonen
Jan W Klinkenberg
Shell Oil Co
Publication date
Application grantedgrantedCritical
Publication of CA677775ApublicationCriticalpatent/CA677775A/en