Flakt AB

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4970770 Method of making a coated heat exchanger with tubes and finsExpiredAug 31, 89Nov 20, 90[B21D]
4963330 Method and apparatus for treating contaminated gasesExpiredMay 30, 89Oct 16, 90[B05B, B01D]
4941896 Method and apparatus for cleansing gasesExpiredMar 31, 89Jul 17, 90[B01D]
4936878 Method for cleansing gas and apparatus hereforExpiredMar 17, 89Jun 26, 90[B01D]
4824032 Method and an arrangement for mixing a dry material with a liquidExpiredOct 16, 87Apr 25, 89[B02B, B02C]
D300771 Plate heat exchangerExpiredFeb 22, 85Apr 18, 89[]
D299546 Channels for a filter bank supporting latticeworkExpiredJul 23, 85Jan 24, 89[]
4799318 Arrangement in the drying section of a paper machineExpiredMar 18, 87Jan 24, 89[D06F]
4795566 Method for cleansing a contaminated medium in a contact reactorExpiredNov 15, 85Jan 03, 89[B01D]
4790692 Arrangement for transporting disintegrated particulate solidsExpiredMar 04, 87Dec 13, 88[B65G]
4780804 Method and an arrangement for enabling the magnetizing current passing through a transformer to be minimized when an asymmetric load is applied to the secondary side of the transformerExpiredDec 15, 87Oct 25, 88[H02M]
4776263 Device for a suspended ceiling structure for rectangular filter elementsExpiredMay 30, 86Oct 11, 88[F24F]
4764188 Electrostatic precipitatorExpiredMar 18, 87Aug 16, 88[B03C]
4750552 Arrangement in a unit having a heat-exchange functionExpiredSep 10, 86Jun 14, 88[H01L, F24F]
4750916 Method and arrangement for cleansing a flow of hot contaminated gasExpiredFeb 04, 87Jun 14, 88[B03C, B01D]
4719708 Arrangement in material drying systemsExpiredDec 31, 85Jan 19, 88[F26B]
4712277 Method and apparatus for producing a continuous webExpiredDec 03, 86Dec 15, 87[D01H]
4711162 Method of ventilating roomsExpiredJun 11, 86Dec 08, 87[F24F]
4710208 Suspendable modular frame arrangement for clean room ceilings having a fluid sealExpiredDec 27, 85Dec 01, 87[B01D]
4704672 Method and arrangement for varying a voltage occurring between the electrodes of an electrostatic dust separatorExpiredMay 13, 85Nov 03, 87[B03C]

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