AT&T Information Systems Inc.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
G06F ELECTRIC DIGITAL DATA PROCESSING 1446

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5313614 Method and apparatus for direct conversion of programs in object code form between different hardware architecture computer systemsDec 06, 88May 17, 94[G06F]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
D332465 Operators's control unit for a printerExpiredOct 05, 88Jan 12, 93[]
5179669 Multiprocessor interconnection and access arbitration arrangementExpiredAug 22, 88Jan 12, 93[G06F]
5179708 System inhibiting message delivery to destination process until priority of process excuting on distination processor is no higher than priority of sending processExpiredApr 07, 89Jan 12, 93[G06F]
5155833 Multi-purpose cache memory selectively addressable either as a boot memory or as a cache memoryExpiredMay 11, 87Oct 13, 92[G06F]
5136707 Reliable database administration arrangementExpiredOct 28, 88Aug 04, 92[G06F]
5120939 Databaseless security systemExpiredNov 09, 89Jun 09, 92[G06F, G06K]
5121426 Loudspeaking telephone station including directional microphoneExpiredDec 22, 89Jun 09, 92[H04M, H04R]
5117372 Graphics-assisted terminal administration arrangementExpiredJul 20, 89May 26, 92[G06F]
5109329 Multiprocessing method and arrangementExpiredFeb 06, 87Apr 28, 92[G06F]
5109515 User and application program transparent resource sharing multiple computer interface architecture with kernel process level transfer of user requested servicesExpiredSep 28, 87Apr 28, 92[G06F]
5093827 Control architecture of a multi-node circuit- and packet-switching systemExpiredSep 21, 89Mar 03, 92[H04G]
D323489 Portable terminal for smart cardsExpiredNov 13, 89Jan 28, 92[]
5084815 Sorting and merging of files in a multiprocessorExpiredMay 14, 86Jan 28, 92[G06F]
D322961 Integrated voice data terminalExpiredSep 19, 88Jan 07, 92[]
D322962 Combined integrated voice data terminal and standalone keyboardExpiredSep 19, 89Jan 07, 92[]
5062108 ISDN codeset conversionExpiredSep 29, 89Oct 29, 91[H04J]
5056088 Apparatus and method for efficiently coupling digital signals to a communications medium in information packetsExpiredMay 01, 89Oct 08, 91[H04J]
5052000 Technique for improving the operation of decision feedback equalizers in communications systems utilizing error correctionExpiredJun 09, 89Sep 24, 91[G06F]
5043982 Multichannel multipoint network using time-division multiplexing incorporating a time offset for propagation delayExpiredMay 24, 89Aug 27, 91[H04J]
5034944 Optical fiber bus controllerExpiredOct 31, 88Jul 23, 91[H04J]

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