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.)
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.)
BORDON Co
National Carbon Co Inc
Original Assignee
BORDON Co
National Carbon Co Inc
Publication date
Application grantedgrantedCritical
Publication of CA366642ApublicationCriticalpatent/CA366642A/fr