CHARBONNAGES DE FRANCE (ETABLISSEMENT PUBLIC)

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5330572 Method of slaking quicklime contained in ashExpiredJul 07, 92Jul 19, 94[C04B]
4880311 Apparatus for supplying unclogging gas to fluidized bed apparatusExpiredOct 21, 86Nov 14, 89[B01F]
4746492 Apparatus for the control of heat energy exchanged with a fluidized bedExpiredJul 31, 86May 24, 88[F27B]
4737171 Portable individual dust collectorExpiredAug 01, 86Apr 12, 88[B01D]
4669921 Device for supplying a powdery product in gravimetrically metered amounts to a pneumatic lineExpiredJun 17, 85Jun 02, 87[B65G]
4660892 Sectorial sprinkling device for coal miningExpiredNov 20, 85Apr 28, 87[E21F, E21C]
4648330 Apparatus for injecting fluidization gasExpiredApr 24, 85Mar 10, 87[F23C]
4628831 Hearth and process for fluidized-bed treatment of a fuelExpiredApr 29, 85Dec 16, 86[F23G]
4624339 Sound-proofing casing for a pneumatic percussive drillExpiredNov 02, 84Nov 25, 86[F01N]
4616426 Valve for the pneumatic distribution of fluidizable materialExpiredJul 02, 85Oct 14, 86[F26B]
4606896 Apparatus for supplying a controlled flow of gas to a fluidized gridExpiredFeb 04, 85Aug 19, 86[F12B]
4591009 Drill soundproofing deviceExpiredOct 19, 84May 27, 86[E21B, E21C]
4534230 Individual portable dust collectorExpiredAug 01, 83Aug 13, 85[G01N]
4382777 Process for modifying the properties of a swelling coal, an installation for carrying out the process and a chamber for treatment of coal by fluidization and crushingExpiredApr 03, 81May 10, 83[B02C, F27B]

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