Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US08/277,450external-prioritypatent/US5515427A/en
Application filed by At & T CorpfiledCriticalAt & T Corp
Priority to SG1995000890ApriorityCriticalpatent/SG30418A1/en
Publication of SG30418A1publicationCriticalpatent/SG30418A1/en