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
CA807590A
Inventor
Schrader Richard
Reinhardt Helmut
Kneschke Gotz
Grunwoldt Wilfried
Hennek Hubert
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.)
Magnesitwerk Aken GmbH
Original Assignee
Magnesitwerk Aken GmbH
Publication date
Application grantedgrantedCritical
Publication of CA807590ApublicationCriticalpatent/CA807590A/en