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
CA590927A
Inventor
L. Van Winkle John
R. Bell Edward
C. Morris Rupert
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 Development Co
Original Assignee
Shell Development Co
Publication date
Application grantedgrantedCritical
Publication of CA590927ApublicationCriticalpatent/CA590927A/en