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
CA628503A
Inventor
Metzger Walter
Schunemann Heinz
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.)
Rain Carbon Germany GmbH
Original Assignee
Ruetgerswerke AG
Publication date
Application grantedgrantedCritical
Publication of CA628503ApublicationCriticalpatent/CA628503A/en