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
CA828463A
Inventor
A. Erickson Leonard
T. Wise Robert
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.)
Big Drum Inc
Original Assignee
Big Drum Inc
Publication date
Application grantedgrantedCritical
Publication of CA828463ApublicationCriticalpatent/CA828463A/en