Rhone-Poulenc Recherches

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4900626 Hollow composite fibers selectively permeable to water vaporExpiredJul 28, 87Feb 13, 90[D01D, D02G]
4810384 Hydrophilic PVDF semipermeable membraneExpiredJun 29, 87Mar 07, 89[C08J, B01D]
4805469 Apparatus for automatically taking and analyzing samples of substances which are made available in random mannerExpiredJun 17, 87Feb 21, 89[G01N]
4756725 Trapping tube adapted to be fitted at the outlet of a gas chromatograph and device for supporting and presenting such a tubeExpiredAug 27, 86Jul 12, 88[B01D]
4709005 Thermotropic aromatic polyestersExpiredJan 13, 86Nov 24, 87[C08G]
4698170 Process for the preparation of very highly alkaline, calcium-based detergent-dispersant additives and products produced therefromExpiredJul 09, 84Oct 06, 87[G10M]
4675384 Fractionation/purification of plasma by ion exchange chromatographyExpiredApr 02, 84Jun 23, 87[A61K, B01D]
4668824 Preparation of tri-(m-sulfophenyl)-phosphineExpiredJul 30, 84May 26, 87[C07F]
4665985 Reversible plugging of oil bearing formationsExpiredFeb 19, 85May 19, 87[E21B]
4655898 Electrophoretic fractionation apparatusExpiredJun 26, 86Apr 07, 87[B01D]
4636552 Novel silicone/polylactone graft copolymerExpiredMay 30, 85Jan 13, 87[C08G, C08L]
4565606 Metallization of electrically insulating polyimide/aromatic polyamide film substratesExpiredApr 16, 84Jan 21, 86[C25D]
4564424 Metallization of electrically insulating polymeric film substratesExpiredApr 16, 84Jan 14, 86[C25D]

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