Lignes Telegraphiques et Telephoniques

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4708425 Bidirectional optical wavelength multiplexer-demultiplexerExpiredOct 09, 84Nov 24, 87[G02B]
4697873 Device for protecting optical fibers freed at the end of a cable elementExpiredMar 25, 82Oct 06, 87[G02B]
4594728 Synchronization device for digital frame transmissionExpiredJun 26, 84Jun 10, 86[H04L]
4525833 Process for time-sequenced multiplexing of data on a transmission medium and devices to implement this processExpiredSep 24, 82Jun 25, 85[H04J]
4512790 Rotary sealing deviceExpiredApr 16, 82Apr 23, 85[C03B]
4490712 Information transcoding process and a transmission system using such a processExpiredJul 27, 81Dec 25, 84[H03K]
4479230 Process and apparatus for the synchronization on reception of a signal provided with a synchronization patternExpiredFeb 01, 82Oct 23, 84[H04L]
4459701 Process and device for synchronizing at reception digital signals transmitted in packagesExpiredJan 15, 82Jul 10, 84[H04L]
4457770 Method and apparatus for the production of optical fibers with lateral gaseous injectionExpiredApr 01, 82Jul 03, 84[C03B]
4442575 Tool-supporting device for machining a cylindrical rod and a machining head fitted with said deviceExpiredOct 30, 81Apr 17, 84[B23P, B23D]
4441786 Device for positioning optical fibers in a terminal connector for splicing two optical fiber transmission cablesExpiredOct 30, 81Apr 10, 84[G02B]
4430572 Device for separating two light signals emitted by sources having different wavelengths and transmitted in a single optical fiberExpiredSep 14, 81Feb 07, 84[G02B]
4427938 Very-wide-band samplersExpiredDec 05, 80Jan 24, 84[G01R]
4416507 Method for in situ splicing optical fiber cablesExpiredApr 30, 81Nov 22, 83[G02B]
4411130 Head for the simultaneous laying of optical fibers within a grooved cylindrical supportExpiredFeb 09, 82Oct 25, 83[D07B, D01H]
4399565 Device for triggering an alarm system in the event of insufficiency of the transmission level, for the receiver module of an optical-fiber transmission systemExpiredFeb 09, 81Aug 16, 83[H04B]
4399566 Device for stabilizing the output power of a transmitter module in an optical fiber transmission systemExpiredNov 12, 81Aug 16, 83[H04B]
4382732 Machining station for a production line for optical fiber cable elementsExpiredMay 12, 80May 10, 83[B23D]
4375075 Tantalum capacitors with internal current-limiting meansExpiredMar 27, 80Feb 22, 83[H01G]
4369525 Device for automatic regulation of the output power of a transmitter module in an optical-fiber transmission systemExpiredFeb 20, 81Jan 18, 83[H04B]

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