DRAVO CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4779992 Lime slakerExpiredJun 03, 87Oct 25, 88[B01F]
4760968 Integrated dust containment system for rotary crusher/breakers and the likeExpiredJun 30, 87Aug 02, 88[B02C]
4714097 Dust containment system for bulk cargo containersExpiredOct 14, 86Dec 22, 87[B65B]
4699187 Dust control in hoppersExpiredOct 23, 86Oct 13, 87[B65B]
4655401 Rotary car dumper with lump breaker apparatusExpiredAug 22, 85Apr 07, 87[B02C]
4609321 Rotary car dumper with dust collection systemExpiredOct 29, 84Sep 02, 86[B65G]
4573637 Accelerating slugs of liquidExpiredDec 06, 82Mar 04, 86[B05B]
4563195 Method for treatment of tar-bearing fuel gasExpiredNov 13, 84Jan 07, 86[C10K]
4548315 Tethered vehicle for moving bulk materialExpiredJun 07, 83Oct 22, 85[B65G]
4512260 Train holding apparatus with means for relieving the load imposed thereon during disengagementExpiredSep 29, 82Apr 23, 85[B61K, B61J, B61B]
4506781 Self training belt conveyor with digging elementsExpiredJun 07, 83Mar 26, 85[B65G]
4501539 Apparatus for removing the liquid phase from a slurry of fine granular materialExpiredDec 02, 83Feb 26, 85[B29C, B28B, B30B]
4490237 Process for recovering heat from the combustion of residual carbon in oil depleted shaleExpiredJul 01, 83Dec 25, 84[C10G, C10B]
4487547 Method for random car train positioningExpiredJun 17, 82Dec 11, 84[B65G]
4479749 Rotary car dumper installation with integral dust collectionExpiredMay 27, 82Oct 30, 84[B65G]
4479808 Pokehole system for fixed bed gasifier and pokehole unitExpiredAug 08, 83Oct 30, 84[C10J]
4475987 Method of and apparatus for the mixing and processing of fragile material and fragmentel solidsExpiredDec 29, 82Oct 09, 84[C10B]
4444539 Apparatus for clamping a railroad car in a rotary car dumperExpiredApr 06, 82Apr 24, 84[B65G]
4439307 Heating process gas for indirect shale oil retorting through the combustion of residual carbon in oil depleted shaleExpiredJul 01, 83Mar 27, 84[C10G, C10B]
4420404 Process for dewatering fine granular materialsExpiredDec 14, 81Dec 13, 83[B01D]

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