L'Etat Francais represente par le Ministre des Postes, des Telecommunications et de l'Espace (Centre National d'Etudes des Telecommunications)

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
 
 
G06K RECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS 1190
 
 
 
G10L SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION 191
 
 
 
H04K SECRET COMMUNICATION; JAMMING OF COMMUNICATION155

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5524172 Processing device for speech synthesis by addition of overlapping wave formsApr 04, 94Jun 04, 96[G10L]
5218637 Method of transferring a secret, by the exchange of two certificates between two microcomputers which establish reciprocal authorizationJun 11, 91Jun 08, 93[H04K]
5184001 System for remote information interchange between a portable object and a stationJul 11, 91Feb 02, 93[G06K]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5254293 Method for obtaining an organic polycrystalline materialExpiredOct 20, 92Oct 19, 93[B29D, B29C]
5255005 Dual layer resonant quadrifilar helix antennaExpiredNov 05, 90Oct 19, 93[H01Q]
5213906 Composite material comprising a layer of a III-V compound and a layer of rare earth pnictide, production process and applicationExpiredApr 06, 90May 25, 93[B32B]
5115285 Method of producing a quasi-flat semiconductor device capable of a multi-wavelength laser effect and the corresponding deviceExpiredApr 25, 91May 19, 92[H01L]
5081540 Holographic apparatus using incoherent lightExpiredApr 20, 90Jan 14, 92[G03H]
5081541 Incoherent light holographic method and apparatus for studying ground reliefExpiredApr 20, 90Jan 14, 92[G03H]
5074955 Process for the anisotropic etching of a III-V material and application to the surface treatment for epitaxial growthExpiredAug 17, 90Dec 24, 91[H01L]
5043236 Process for determining the focussing of a photolithographic apparatusExpiredDec 29, 89Aug 27, 91[G03C]
5043291 Method of manufacturing a broadband high emission power semiconductor laser from a BRS type buried stripe structure, and resulting laserExpiredSep 07, 89Aug 27, 91[H01L]
5041778 Electrooptic measurement systems for frequency analysis of very wide range signalsExpiredJul 17, 89Aug 20, 91[G01R]
4980885 Power consumption reducing device for cyclic operating equipment such as a time-division switcherExpiredApr 11, 89Dec 25, 90[H04J]
4976504 Holographic method and apparatus using incoherent lightExpiredDec 22, 89Dec 11, 90[G03H]
4974186 Generalized digital multiplier and digital filter using said multiplierExpiredJan 24, 89Nov 27, 90[G06F]
4961221 Communication method and system with encryption of informationExpiredDec 12, 89Oct 02, 90[H04K, H04L, H04B, H04T]
4959619 Digital transmission demodulator including an automatic fault correctorExpiredNov 20, 89Sep 25, 90[H03D]
4956645 Radio system for data transmission with one passive end and station included in such a systemExpiredMay 15, 89Sep 11, 90[H01Q]
4956838 Echo cancelling device with frequency sub-band filteringExpiredMar 14, 89Sep 11, 90[H04B]
4947446 Method and circuit for filtering signals representative of a pictureExpiredNov 08, 89Aug 07, 90[G06K]
4944244 Apparatus for the production of preforms for optical fibersExpiredMar 14, 89Jul 31, 90[C23C]
4939749 Differential encoder with self-adaptive predictive filter and a decoder suitable for use in connection with such an encoderExpiredMar 14, 89Jul 03, 90[H04B]

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