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
CA671144A
Inventor
D. Davidson Maurice
G. T. Busby Howard
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.)
Lodge Cottrell Ltd
Original Assignee
Lodge Cottrell Ltd
Publication date
Application grantedgrantedCritical
Publication of CA671144ApublicationCriticalpatent/CA671144A/en