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
CA678811A
Inventor
E. De Neergaard Leif
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.)
DYREK A GERARD
HANS TRECHSEL
Original Assignee
DYREK A GERARD
HANS TRECHSEL
Publication date
Application grantedgrantedCritical
Publication of CA678811ApublicationCriticalpatent/CA678811A/en