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
CA601458A
Inventor
N. Haward Robert
Katz Dov
N. Roper Alec
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
Alec N Roper
Shell Oil Co
Publication date
Application grantedgrantedCritical
Publication of CA601458ApublicationCriticalpatent/CA601458A/en