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
CA640615A
Inventor
Diener Richard
Wennemann Werner
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.)
HOESCH ROHRWERKE AG
Original Assignee
HOESCH ROHRWERKE AG
Publication date
Application grantedgrantedCritical
Publication of CA640615ApublicationCriticalpatent/CA640615A/en