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
CA787075A
Inventor
A. Friesen Peter
P. C. Breuers Theo
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.)
Van der Grinten NV
Original Assignee
Van der Grinten NV
Publication date
Application grantedgrantedCritical
Publication of CA787075ApublicationCriticalpatent/CA787075A/en