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
CA790489A
Inventor
Brunner Helmut
Schmitz Franz-Theo
Schutte Dieter
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.)
Evonik Operations GmbH
Original Assignee
Franz-Theo Schmitz
Helmut Brunner
Deutsche Gold und Silber Scheideanstalt
Publication date
Application grantedgrantedCritical
Publication of CA790489ApublicationCriticalpatent/CA790489A/en