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
CA677400A
Inventor
E. Ash Michael
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.)
Arthur Guinness Son and Co Park Royal Ltd
Original Assignee
Arthur Guinness Son and Co Park Royal Ltd
Publication date
Application grantedgrantedCritical
Publication of CA677400ApublicationCriticalpatent/CA677400A/en