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
CA677444A
Inventor
David A. Feigley, Jr.
Leonard N. Ray, Jr.
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 World Industries Inc
Original Assignee
Armstrong Cork Co
Publication date
Application grantedgrantedCritical
Publication of CA677444ApublicationCriticalpatent/CA677444A/en