International Coal Refining Company

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4924784 Firing of pulverized solvent refined coalExpiredFeb 27, 84May 15, 90[F23D]
4737261 Process for the production of premium grade needle coke from a hydrotreated SRC materialExpiredOct 05, 84Apr 12, 88[C10B]
4675024 Process for preparing a stabilized coal-water slurryExpiredApr 06, 84Jun 23, 87[C10L]
4634680 Sequential elution processExpiredJul 14, 83Jan 06, 87[G01N, B01D]
4609455 Coal liquefaction with preasphaltene recycleExpiredFeb 21, 85Sep 02, 86[C10G]
4603115 Automated process for solvent separation of organic/inorganic substanceExpiredOct 19, 84Jul 29, 86[G01N]
4583868 Temperature differential detection deviceExpiredOct 03, 83Apr 22, 86[G01K]
4576121 Convective heaterExpiredJan 27, 84Mar 18, 86[F22D]
4570551 Firing of pulverized solvent refined coalExpiredMar 09, 84Feb 18, 86[F23D]
4558651 Fired heater for coal liquefaction processExpiredOct 19, 83Dec 17, 85[C10G, F23D]
4555248 Process for stabilizing the viscosity characteristics of coal derived materials and the stabilized materials obtained therebyExpiredJun 20, 84Nov 26, 85[C10L]
4547201 SRC Residual fuel oilsExpiredDec 14, 83Oct 15, 85[C10L]
4536275 Integrated two-stage coal liquefaction processExpiredMar 07, 84Aug 20, 85[C10G]
4534847 Process for producing low-sulfur boiler fuel by hydrotreatment of solvent deashed SRCExpiredJan 16, 84Aug 13, 85[C10G]
4521299 Removal of basic nitrogen compounds from hydrocarbon liquidsExpiredOct 31, 83Jun 04, 85[C10G]
4518479 Time phased alternate blending of feed coals for liquefactionExpiredJun 19, 84May 21, 85[C10G]
4514281 Corrosion inhibition for distillation apparatusExpiredMar 21, 84Apr 30, 85[C10G]
4511453 Corrosion inhibition when distilling coal liquids by adding cresols or phenolsExpiredMar 21, 84Apr 16, 85[C10G]
4511460 Minimizing corrosion in coal liquid distillationExpiredMar 21, 84Apr 16, 85[C10G, C23F]
4510040 Coal liquefaction processExpiredNov 07, 83Apr 09, 85[C10G]

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