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.)
Columbian Carbon Co
Original Assignee
Columbian Carbon Co
Publication date
Priority to CA 28123priorityCriticalpatent/CA28123S/en
Application grantedgrantedCritical
Publication of CA28123SpublicationCriticalpatent/CA28123S/en