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
CA638274A
Inventor
H. Harris Philip
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.)
American Cement Corp
Original Assignee
American Cement Corp
Publication date
Application grantedgrantedCritical
Publication of CA638274ApublicationCriticalpatent/CA638274A/en