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
CA621183A
Inventor
S. Mackay Johnstone
J. Vancheri Frank
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.)
Pittsburgh Coke and Chemical Co
Original Assignee
Frank J Vancheri
Pittsburgh Coke and Chemical Co
Publication date
Application grantedgrantedCritical
Publication of CA621183ApublicationCriticalpatent/CA621183A/en