FRANCE TELECOM ETABLISSEMENT AUTONOME DE DROIT PUBLIC

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
H01S DEVICES USING STIMULATED EMISSION488
 
  
 
G02B OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS 3202
 
  
 
H01L SEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR 3359
 
  
 
H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION 3282
 
  
 
G10L SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION 295
 
  
 
H04B TRANSMISSION 2208
 
  
 
H04K SECRET COMMUNICATION; JAMMING OF COMMUNICATION256
 
  
 
H04M TELEPHONIC COMMUNICATION 2161
 
  
 
B23K SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM 192
 
  
 
C02F TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE 154

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5704002 Process and device for minimizing an error in a speech signal using a residue signal and a synthesized excitation signalMar 04, 94Dec 30, 97[G10L]
5539760 Process for the transposition of an optical modulation of one wavelength to another adjustable wavelengthSep 02, 94Jul 23, 96[H01S]
5519801 Small, high precision, multicore optical guides and process for the production of said guidesFeb 04, 94May 21, 96[G02B]
5510923 Telecommunications system combining wavelength multiplexing and packet switching networksApr 03, 95Apr 23, 96[H04J]
5502591 Optical amplifier with a doped fluoride glass of optical fibre and process for producing said amplifierJan 24, 95Mar 26, 96[H01S]
5502832 Associative memory architectureJan 28, 93Mar 26, 96[G06F]
5498969 Device for the vector measurement of ultra-high frequency signals of the same angular frequency of the six port junction typeJul 05, 94Mar 12, 96[G01R]
5495098 Smart card updating processMar 31, 94Feb 27, 96[G06K]
5483108 Uninterrupted distributed storage supply systemJun 25, 93Jan 09, 96[H02J]
5481612 Process for the authentication of a data processing system by another data processing systemDec 15, 93Jan 02, 96[H04L]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5657412 Splice case for fibre optic cablesExpiredFeb 01, 96Aug 12, 97[G02B]
5617227 Light diffraction device using reconfigurable spatial light modulators and the fractional talbot effectExpiredNov 17, 95Apr 01, 97[G02F, G03H]
5559613 Photorefractive device with quantum wellsExpiredAug 05, 94Sep 24, 96[G02B]
5555121 Process for simultaneous optical modulation transposition on several wavelengthsExpiredSep 15, 95Sep 10, 96[H04B, H01S]
5555307 Device and process for rendering secure the transmission of faxes, as well as fax unit which has been made secure and incorporating such a deviceExpiredJan 26, 94Sep 10, 96[H04L]
5515193 Optical communications system using travelling wave semiconductor optical amplifiersExpiredAug 28, 92May 07, 96[H04B]
5493438 Amplitude optical modulator using a two-electrode DFB laser structureExpiredMar 21, 94Feb 20, 96[G02F]
5477555 Method and device for generating optical pulsesExpiredJan 21, 94Dec 19, 95[H01S]
5434692 Optical device for the recovery of the timing of a coded signalExpiredMar 21, 94Jul 18, 95[H04B]
5404242 Photoreceiver for frequency-modulated optical signalsExpiredMar 26, 93Apr 04, 95[H04B]
5317580 Bidirectional transmission system with identical laser componentsExpiredMar 27, 92May 31, 94[H01S]
5313547 Halide glass medium containing trivalent uranium ions and process for producing said mediumExpiredMay 12, 92May 17, 94[G02B]
5307366 Logic function generator using an optical transposition in a distributed feedback laser diodeExpiredOct 01, 92Apr 26, 94[H01S]
5261014 Optoelectronic device with integrated optical guide and photo-detector.ExpiredSep 02, 92Nov 09, 93[G02B]
5252181 Method for cleaning the surface of a substrate with plasmaExpiredDec 17, 91Oct 12, 93[B44C]
5243260 Method to produce a display screen with a matrix of transistors provided with an optical maskExpiredSep 19, 91Sep 07, 93[G02K]
5081004 Method to produce a display screen with a matrix of transistors provided with an optical maskExpiredNov 02, 89Jan 14, 92[H01L]
5003302 Dual addressing transistor active matrix display screenExpiredJun 16, 86Mar 26, 91[G09G]
4836650 Process for the production of a diode array and liquid crystal display screenExpiredNov 07, 86Jun 06, 89[H01L, G02F]
4792210 Active matrix display screen with transistor sources connected to adjacent addressing lines and processes for making this screenExpiredJan 27, 87Dec 20, 88[G09G, G02F]

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