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
CA648923A
Inventor
Kloepfer Harry
Meyer-Simon Eugen
Schrauf Robert
Frey Artur
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
Artur Frey
Robert Schrauf
Deutsche Gold und Silber Scheideanstalt
Publication date
Application grantedgrantedCritical
Publication of CA648923ApublicationCriticalpatent/CA648923A/en