Ahlstromforetagen Svenska AB

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5186726 Suspension deaerating processExpiredMay 11, 90Feb 16, 93[B01D]
5048200 Process and apparatus for dehumidifying wet airExpiredJun 19, 90Sep 17, 91[F26B]
4979965 Method of dehumidifying gasesExpiredJul 14, 89Dec 25, 90[B01D]
4975148 Cold blow system for batch production of pulpExpiredDec 06, 88Dec 04, 90[D21C]
4963231 Method for evaporation of liquidsExpiredJun 13, 88Oct 16, 90[B01D]
4944840 Method and apparatus for evaporating waste liquor produced when cooking fibrous material containing celluloseExpiredJan 11, 89Jul 31, 90[D21C]
4930429 Apparatus and process for generating steam from wet fuelExpiredSep 01, 89Jun 05, 90[F23G]
4925527 Method for the recovery of turpentine and heat in a refiner pulping processExpiredFeb 22, 89May 15, 90[D21C]
4888882 Method and apparatus for drying a particulate material such as barkExpiredMar 01, 89Dec 26, 89[F26B]
4878441 Apparatus and process for generating steam from wet fuelExpiredAug 11, 88Nov 07, 89[F23G]
4877080 Process and apparatus for cooling a fluidExpiredJun 13, 88Oct 31, 89[F25B, B41C, B22D]
4864830 Air conditioning process and apparatusExpiredJun 13, 88Sep 12, 89[F25D]
4860548 Air conditioning process and apparatus thereforExpiredJun 13, 88Aug 29, 89[F25D]
4810327 Falling film evaporator of the vertical-tube typeExpiredApr 18, 85Mar 07, 89[B01D]
4789428 Method for evaporation of spent liquorExpiredJun 03, 86Dec 06, 88[B01D]

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