Nippon Telegraph and Telephone Company

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
G11B INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER 2136
 
  
 
A47L DOMESTIC WASHING OR CLEANING 159
 
  
 
G02B OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS 1204
 
  
 
G03C PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES 145
 
  
 
H03F AMPLIFIERS 182
 
  
 
H04B TRANSMISSION 1209
 
  
 
H04K SECRET COMMUNICATION; JAMMING OF COMMUNICATION157
 
  
 
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
8290170 Method and apparatus for speech dereverberation based on probabilistic models of source and room acousticsMay 01, 06Oct 16, 12[H04B]
7889866 Information leakage prevention apparatus and information leakage prevention methodMay 24, 05Feb 15, 11[H04L, H04K]
5960138 Backplane connectorMay 04, 98Sep 28, 99[G02B]
5633848 Method and apparatus for cleaning an optical disk head on the basis of time accumulationMay 12, 95May 27, 97[G11B]
5612170 Positive resist compositionDec 08, 95Mar 18, 97[G03C]
5600722 System and scheme of cipher communicationOct 06, 94Feb 04, 97[H04L]
5499223 Beam position control system of an optical disk unitJun 01, 95Mar 12, 96[G11B]
5220703 Combination of optical connector cleaner and holder jigMar 20, 92Jun 22, 93[A47L]
5146178 Impedance-matched, class F high-frequency amplifierSep 13, 91Sep 08, 92[H03F]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
7493047 Transceiver suitable for data communications between wearable computersExpiredMay 31, 07Feb 17, 09[H04B]
7398599 Device for removing coating on optical fiberExpiredFeb 23, 04Jul 15, 08[H02G]
7286988 Speech recognition based interactive information retrieval scheme using dialogue control to reduce user stressExpiredJul 15, 03Oct 23, 07[G10L]
6754960 Device for removing coating on optical fiberExpiredApr 15, 02Jun 29, 04[H02G]
6542171 Scheme for graphical user interface using polygonal-shaped sliderExpiredJul 07, 99Apr 01, 03[G09G, A63F]
6363375 Classification tree based information retrieval schemeExpiredSep 30, 99Mar 26, 02[G06F]
6312164 Optical connector and method of and fixture for setting projection length of optical fiberExpiredApr 21, 00Nov 06, 01[G02B]
5721772 Subband acoustic echo cancellerExpiredOct 15, 96Feb 24, 98[H04M, G06F]
5612790 Method and apparatus for multiplexed video data reading in video library systemExpiredSep 01, 94Mar 18, 97[H04N]
5442561 Production management system and its application methodExpiredMay 10, 93Aug 15, 95[G06F]
5202906 Frequency divider which has a variable length first cycle by changing a division ratio after the first cycle and a frequency synthesizer using sameExpiredDec 23, 87Apr 13, 93[H03L, H03K]
5129017 Electrically controlled optical deviceExpiredFeb 14, 90Jul 07, 92[G02B, G02F]
4910761 Radio telephoneExpiredMar 02, 89Mar 20, 90[H04Q]

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