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
CA743768A
Inventor
L. Roberts Donald
N. Schumacher Joseph
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.)
RJ Reynolds Tobacco Co
Original Assignee
RJ Reynolds Tobacco Co
Publication date
Application grantedgrantedCritical
Publication of CA743768ApublicationCriticalpatent/CA743768A/en