Asea Stal Aktiebolag

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4897908 Method of attaching tubes in a tube plate in a heat exchangerExpiredMar 19, 85Feb 06, 90[B23P]
4893466 Method of operating a gas turbine unitExpiredMay 15, 89Jan 16, 90[F02C]
4860693 Method in fluidized bed combustionExpiredAug 26, 87Aug 29, 89[F22B]
4855103 Method for manufacturing metallic products from powder by hot isostatic pressing using ceramic coresExpiredDec 21, 87Aug 08, 89[B22F]
4848276 Fluidized bed power plant with bed material crusherExpiredFeb 19, 88Jul 18, 89[F23G, F22B]
4820484 Method in producing a molding of an iron alloyExpiredOct 02, 86Apr 11, 89[C22F]
4805405 Power plant with combustion of a fuel in a fluidized bedExpiredJun 23, 87Feb 21, 89[F02C]
4802796 Pressure-reducing device for particulate materialExpiredSep 29, 87Feb 07, 89[B65G]
4782771 Method of reducing the content of nitrogen oxides in multiple bed composition boilersExpiredJul 08, 87Nov 08, 88[F23J]
4779574 Power plant with combustion in a fluidized bedExpiredOct 28, 87Oct 25, 88[F23B]
4767315 Method of controlling the depth of a fluidized bed in a power plant and a power plant with means for controlling the bed depthExpiredOct 10, 86Aug 30, 88[F23D]
4767243 Pneumatic conveying system with directional change of a gas/particulate material streamExpiredFeb 26, 86Aug 30, 88[B65G]
4760817 Fluidized bed combustion chamber in a power plantExpiredDec 02, 87Aug 02, 88[F22B]
4756257 Power plant with centrifugal type cleaners for combustion gasesExpiredFeb 20, 87Jul 12, 88[F23J]
4744212 Method of controlling a PFBC plant in the event of operational disturbance in the gas turbine unit and a PFBC plant with equipment for such controlExpiredJan 27, 87May 17, 88[F02C]
4736692 Method of handling fuelExpiredJun 18, 86Apr 12, 88[F23G]
4730452 Power plant with a combustion chamber with combustion in a fluidized bedExpiredAug 13, 86Mar 15, 88[F02C, F02G]
4730563 Power plant with centrifugal separators for returning material from combustion gases to a fluidized bedExpiredFeb 20, 87Mar 15, 88[F23J]
4722182 Power plant with combustion in a fluidized bedExpiredOct 06, 86Feb 02, 88[F02C]
4705433 Pneumatic transportation system with a material feederExpiredMay 09, 86Nov 10, 87[B65G]

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