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
CA672745A
Inventor
A. C. De Rycke Douglas
Endter Friedrich
Bonath Klaus
Rippon Alan
A. Lewis John
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
Peter Spence and Sons Ltd
Original Assignee
Alan Rippon
Deutsche Gold und Silber Scheideanstalt
Peter Spence and Sons Ltd
Publication date
Application grantedgrantedCritical
Publication of CA672745ApublicationCriticalpatent/CA672745A/en