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
CA855595A
Inventor
L. A. Duret Jean
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.)
Vallourec SA
Original Assignee
Jean L A Duret
Vallourec SA
Publication date
Application grantedgrantedCritical
Publication of CA855595ApublicationCriticalpatent/CA855595A/en