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
CA652930A
Inventor
J. Barra Frank
F. Chaple William
E. Mcminn Robert
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.)
Black Sivalls and Bryson Inc
Original Assignee
Black Sivalls and Bryson Inc
Publication date
Application grantedgrantedCritical
Publication of CA652930ApublicationCriticalpatent/CA652930A/en