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
CA804103A
Inventor
W. Brooke Alvin
G. Markey Harold
C. Kuntzleman Harry
Original Assignee
International Business Machines Corp
Publication date
Application grantedgrantedCritical
Publication of CA804103ApublicationCriticalpatent/CA804103A/en