TELEGRAPH AND TELEPHONE CORPORATION

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
G02B OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS 1204
 
  
 
H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION 1284

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6886990 Optical connectorMay 08, 03May 03, 05[G02B]
6480605 Encryption and decryption devices for public-key cryptosystems and recording medium with their processing programs recorded thereonDec 17, 98Nov 12, 02[H04L]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5461607 ATM communication apparatus and failure detection and notification circuitExpiredMay 31, 94Oct 24, 95[H04J]
5255329 High-speed fault detecting method and apparatusExpiredMar 29, 89Oct 19, 93[G06K]
5138704 Data processing apparatus having a parallel arrangement of data communication and data computationExpiredOct 31, 90Aug 11, 92[G06F]
5103680 Method of testing split ceramic alignment sleeve and apparatus thereforExpiredDec 12, 90Apr 14, 92[G01N]
5054099 Binary image reduction methodExpiredFeb 21, 90Oct 01, 91[G06K]
4987487 Method of stereoscopic images display which compensates electronically for viewer head movementExpiredAug 09, 89Jan 22, 91[H04N]
4788598 Coding method and apparatusExpiredOct 28, 86Nov 29, 88[H04N]
4752655 Coordinate input deviceExpiredNov 14, 85Jun 21, 88[G08C]
4742558 Image information retrieval/display apparatusExpiredFeb 07, 85May 03, 88[G06F, G06K]
4722008 Halftone picture processing apparatusExpiredJan 08, 86Jan 26, 88[H04N]
4622480 Switched capacitor circuit with high power supply projection ratioExpiredApr 22, 83Nov 11, 86[G05F]
4597101 Method and an apparatus for coding/decoding telewriting signalsExpiredJun 28, 83Jun 24, 86[G06K]
4591909 Interframe coding method and apparatus thereforExpiredApr 20, 84May 27, 86[H04N]
4543574 System for resolving collision in local networkExpiredSep 27, 82Sep 24, 85[H04Q, H04J]
4437095 Selective call receiver having timed power supplyExpiredDec 01, 81Mar 13, 84[G08B, H04Q, H04B]

Top Inventors for This Owner

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