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
R. Emmett John
W. Winkler Ernest
A. Perry John
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.)
Canada, AS REPRESENTED BY MINISTE R OF MINES AND TECHNICAL SURVEYS
Original Assignee
Canada, AS REPRESENTED BY MINISTE R OF MINES AND TECHNICAL SURVEYS
Publication date
Application grantedgrantedCritical
Publication of CA812995ApublicationCriticalpatent/CA812995A/en