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
CA763472A
Inventor
Chi-Sun Yang Julie
F. Osborn Elburt
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.)
Johns Manville Corp
Original Assignee
Johns Manville Corp
Publication date
Application grantedgrantedCritical
Publication of CA763472ApublicationCriticalpatent/CA763472A/en