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
CA740903A
Inventor
Pohl Walter
Mann Hans-Joachim
Simon Klaus
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
Hans-Joachim Mann
Deutsche Gold und Silber Scheideanstalt
Publication date
Application grantedgrantedCritical
Publication of CA740903ApublicationCriticalpatent/CA740903A/en