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
CA740780A
Inventor
E. Goodman John
B. Fordham Bryan
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.)
PEABODY Ltd
Ultrasonics Ltd
Original Assignee
PEABODY Ltd
Ultrasonics Ltd
Publication date
Application grantedgrantedCritical
Publication of CA740780ApublicationCriticalpatent/CA740780A/en