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
Inventor
Lettenbauer Gustav
Ritter Klaus
Haack Erich
Schaumann Wolfgang
Popelak Alfred
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.)
CF Boehringer und Soehne GmbH
Original Assignee
Gustav Lettenbauer
CF Boehringer und Soehne GmbH
Publication date
Application grantedgrantedCritical
Publication of CA772628ApublicationCriticalpatent/CA772628A/en