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
CA671139A
Inventor
Schen Yao-Dzen
Wolf Friedrich
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.)
VEB FARBENFABRIK WOLFEN
Original Assignee
VEB FARBENFABRIK WOLFEN
Publication date
Application grantedgrantedCritical
Publication of CA671139ApublicationCriticalpatent/CA671139A/en