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
CA723854A
Inventor
I. Hayes Dale
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 Zinc Lead and Smelting Co
Original Assignee
American Zinc Lead and Smelting Co
Publication date
Application grantedgrantedCritical
Publication of CA723854ApublicationCriticalpatent/CA723854A/en