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
CA912596A
Inventor
R. Greening Nathan
E. Copeland Llewellyn
J. Verbeck George
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.)
Portland Cement Association
Original Assignee
Portland Cement Association
Publication date
Application grantedgrantedCritical
Publication of CA912596ApublicationCriticalpatent/CA912596A/en