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
CA744322A
Inventor
W. Silverwood Frederick
Barradell-Smith Richard
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.)
Pilkington Group Ltd
Original Assignee
Pilkington Brothers Ltd
Publication date
Application grantedgrantedCritical
Publication of CA744322ApublicationCriticalpatent/CA744322A/en