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
CA797527A
Inventor
Wong Yan Man Wong-Kwong-Fa
K. Hoover Stasel
T. C. Knowles James
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.)
AB Dick Co
Original Assignee
AB Dick Co
Publication date
Application grantedgrantedCritical
Publication of CA797527ApublicationCriticalpatent/CA797527A/en