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
CA652568A
Inventor
Armstrong William
Bartram Mervyn
S. Dickinson Ronald
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.)
Armstrong Patents Co Ltd
Original Assignee
Armstrong Patents Co Ltd
Publication date
Application grantedgrantedCritical
Publication of CA652568ApublicationCriticalpatent/CA652568A/en