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
CA662995A
Inventor
E. Seaman Francis
C. Garrabrant Edmund
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.)
International Pipe and Ceramics Corp
Original Assignee
International Pipe and Ceramics Corp
Publication date
Application grantedgrantedCritical
Publication of CA662995ApublicationCriticalpatent/CA662995A/en