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
CA875685A
Inventor
J. Hirt Thomas
W. Marynowski Chester
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.)
Northern Natural Gas Co
Original Assignee
Northern Natural Gas Co
Publication date
Application grantedgrantedCritical
Publication of CA875685ApublicationCriticalpatent/CA875685A/en