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
CA804523A
Inventor
E. Darr Donald
S. Leiser Roger
E. Loehr Clifford
W. Richardson Kenneth
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.)
PPG Industries Inc
Original Assignee
PPG Industries Inc
Publication date
Application grantedgrantedCritical
Publication of CA804523ApublicationCriticalpatent/CA804523A/en