Dr. C. Otto & Comp. G.m.b.H.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4708196 Shaft cooler for the dry quenching of cokeExpiredMar 23, 84Nov 24, 87[C10B]
4673463 Method for extracting charging gases in coke oven chambersExpiredFeb 04, 86Jun 16, 87[C10B]
4666559 Closure for a gas offtake pipeExpiredAug 05, 85May 19, 87[C10B]
4664140 Reversing valveExpiredJul 24, 85May 12, 87[F16K]
4655488 System for latching a leveling doorExpiredSep 26, 85Apr 07, 87[E05C]
4580908 Thermometer for coke oven chamber wallsExpiredAug 08, 83Apr 08, 86[G01J, C10B]
4564419 Nozzle plate construction for underjet coke ovensExpiredDec 07, 84Jan 14, 86[C10B]
4564420 Coke oven batteryExpiredDec 05, 83Jan 14, 86[C10B]
4564421 Ascension pipe for coke ovensExpiredMay 21, 82Jan 14, 86[C10B]
4561843 Transfer flue with means for improving the flow of gasesExpiredJun 01, 84Dec 31, 85[F24N]
4552622 Cleaning apparatus for the sealing surfaces of leveling doors and leveling door frames of battery-type coke ovensExpiredMay 01, 84Nov 12, 85[C10B]
4518572 Method of washing hydrogen sulfide from coke oven gas by the ammonium sulfide methodExpiredJan 12, 84May 21, 85[B01D]
4515660 Apparatus for removing charging hole covers and for cleaning sealing surfaces in a coke ovenExpiredMay 02, 84May 07, 85[C10B]
4499060 Process for removing hydrogen sulfide from gases, particularly coal distillation gasesExpiredFeb 04, 83Feb 12, 85[C01B]
4497691 Stack cooler for dry quenching of cokeExpiredJan 18, 83Feb 05, 85[C10B]
4491505 Apparatus for leveling coal in a coke oven chamberExpiredDec 05, 83Jan 01, 85[C10B]
4440599 Heating system for a coke oven battery having twin-heating fluesExpiredDec 06, 82Apr 03, 84[C10B]
4435152 Apparatus for improving the flow of gases to a combustion chamber of a coke oven or the likeExpiredSep 28, 81Mar 06, 84[F23D]
4429908 Latching mechanism on coke oven doorsExpiredOct 13, 81Feb 07, 84[E05C, C10B]
4421623 Apparatus for guiding material in strip formExpiredNov 22, 82Dec 20, 83[C25D]

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