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
CA853605A
Inventor
W. Urmetz Walter
C. Carpenter Joel
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.)
OGELBAY NORTON Co
Original Assignee
OGELBAY NORTON Co
Publication date
Application grantedgrantedCritical
Publication of CA853605ApublicationCriticalpatent/CA853605A/en