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
CA875763A
Inventor
W. Bee Mark
D. Snyder Alan
J. Lang Donald
Original Assignee
International Business Machines Corp
Publication date
Application grantedgrantedCritical
Publication of CA875763ApublicationCriticalpatent/CA875763A/en