SOCIETE NATIONAL ELF AQUITAINE PRODUCTION TOUR ELF, 2 PLACE DE LA COUPOLE, LA DEFENSE 6 92400 COURBEVOIE FRANCE

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5087759 Synthesis of vicinal alkanedithiolsExpiredFeb 07, 90Feb 11, 92[C07C]
5068445 Process for the preparation of organic disulphides and polysulphidesExpiredApr 03, 89Nov 26, 91[C07C]
5032026 Interferometric sensor and use thereof in an interferometric deviceExpiredJun 01, 89Jul 16, 91[G01B]
5001271 Synthesis of benzyl mercaptanExpiredApr 10, 89Mar 19, 91[C07C]
5001269 Process for the production of lower dialkyl disulphidesExpiredApr 03, 89Mar 19, 91[C07C]
4933481 Synthesis of organic polysulphidesExpiredJul 27, 89Jun 12, 90[C07C]
4800966 Devices for drilling branched wellsExpiredApr 30, 87Jan 31, 89[E21B]

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