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
CA767616A
Inventor
C. Schwalbe Hellmuth
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.)
Mead Corp
Original Assignee
Mead Corp
Publication date
Application grantedgrantedCritical
Publication of CA767616ApublicationCriticalpatent/CA767616A/en