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
CA608505A
Inventor
Lorenz Albert
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.)
WC Heraus GmbH and Co KG
Ruhrstahl AG
Original Assignee
WC Heraus GmbH and Co KG
Ruhrstahl AG
Publication date
Application grantedgrantedCritical
Publication of CA608505ApublicationCriticalpatent/CA608505A/en