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
CA720859A
Inventor
R. Van Ess Paul
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
Paul R Van Ess
Shell Oil Co
Publication date
Application grantedgrantedCritical
Publication of CA720859ApublicationCriticalpatent/CA720859A/en