TE KA DE Felten & Guilleaume Fernmeldeanlagen GmbH

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4,623,980 Method of processing electrical signals by means of Fourier transformationsExpiredMar 08, 85Nov 18, 86[H03H]
4,595,796 Method of and a circuit arrangement for determining current criteria in the lines of a telephone systemExpiredSep 27, 82Jun 17, 86[H04M]
4,539,690 Automatic and adaptive digital nonlinear decision feedback equalizerExpiredApr 14, 82Sep 03, 85[H04B]
4,525,602 Method of and a circuit for energizing a subscriber's circuit in a telephone systemExpiredSep 27, 82Jun 25, 85[H04M]
4,514,840 Data transmission systems for full duplex communicationExpiredDec 29, 82Apr 30, 85[H04J]
4,476,561 Device for remotely supervising operation of a branched data-transmission networkExpiredMar 29, 82Oct 09, 84[G06F]
4,432,601 Apparatus and method for coupling and decoupling of optical fiber waveguidesExpiredFeb 17, 81Feb 21, 84[G02B]
4,433,213 Subscriber's line circuit for telecommunications networksExpiredFeb 01, 82Feb 21, 84[H04M]
4,417,152 Electric switching deviceExpiredOct 19, 81Nov 22, 83[H02J]
4,395,690 Two-terminal-pair network simulating an inductanceExpiredJun 08, 81Jul 26, 83[H03H]
4,352,110 Method for siting cosine-squared antennas and antenna array obtained therebyExpiredJun 02, 80Sep 28, 82[H01Q]
4,348,769 Circuitry for extraction of a transmission clock signal from-modulated data transmissionsExpiredFeb 19, 80Sep 07, 82[H03K]
4,347,601 Method and system for processing coded information transmitted during cyclically successive time framesExpiredSep 28, 79Aug 31, 82[H04Q, G06F]
4,346,367 Circuit for converting binary digital signals into pseudoternary A.C. pulsesExpiredNov 09, 79Aug 24, 82[H03K]
4,329,677 Signal-light systems, especially for a series of emergency-phone stations distributed along the length of a highway, or the likeExpiredJul 05, 79May 11, 82[H05B, G08B]
4,287,595 Adaptive delta-modulation networkExpiredOct 29, 79Sep 01, 81[H03K]
4,271,514 Loopback test for data transmission pathsExpiredAug 29, 79Jun 02, 81[H04L]
4,264,890 Blinking signal-light system, especially for a series of emergency-phone stations distributed along the length of a highway, or the likeExpiredJul 06, 79Apr 28, 81[G08G, H04B]
4,264,972 Method and circuit for detecting errors in digital signalsExpiredMay 21, 79Apr 28, 81[G06F]
4,247,934 Testing system for data transmission pathsExpiredJun 28, 79Jan 27, 81[H04J, H04B]

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