Aktiebolaget Svenska Flaktfabriken

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4683870 Apparatus for deicing exterior parts of a railway vehicleExpiredJul 22, 85Aug 04, 87[B61B, F23C]
D273702 Adjustable ventilation nozzleExpiredJun 16, 81May 01, 84[]
D265511 Panel structureExpiredApr 02, 80Jul 20, 82[D250]
4337230 Method of absorbing sulfur oxides from flue gases in seawaterExpiredFeb 06, 81Jun 29, 82[C01B]
4326365 Joint system for walls, doors and the likeExpiredJan 24, 80Apr 27, 82[E04C, E04D]
4320695 Air diffuserExpiredMay 09, 80Mar 23, 82[F24F]
4318643 Apparatus for conveying waste materials by suctionExpiredDec 28, 79Mar 09, 82[B65G]
4310691 Method for selectively recovering sodium citrate from an aqueous solutionExpiredOct 31, 79Jan 12, 82[C01B, C07C]
4298367 Method of and device for cleansing in a fibre blanket manufacturing plantExpiredJul 01, 80Nov 03, 81[C03B]
4292809 Procedure for converting low-grade thermal energy into mechanical energy in a turbine for further utilization and plant for implementing the procedureExpiredJul 17, 79Oct 06, 81[F01K, F25B]
4290210 Device for drying web materialExpiredNov 28, 79Sep 22, 81[F26B]
4277255 Cleaning process control method for textile barrier filter materialExpiredJan 23, 80Jul 07, 81[B01D]
4274842 Method of purifying gas containing gaseous mercuryExpiredJan 10, 80Jun 23, 81[B01D]
4269578 Apparatus for forming a web of materialExpiredOct 12, 79May 26, 81[B28B]
4257784 Method and apparatus for cleaning used air from spray booths wherein articles are lacqueredExpiredApr 03, 79Mar 24, 81[B01D]
4253314 Plant for cooling heated goodsExpiredJun 05, 79Mar 03, 81[F25B]
4251048 Pilot valveExpiredMar 16, 79Feb 17, 81[F16R]
4229183 Method of refining solid fuel of organic vegetable materialExpiredMar 30, 79Oct 21, 80[C10L, C10F]
4218188 Axial fanExpiredMay 11, 78Aug 19, 80[F04D]
4215973 Axial fanExpiredMay 11, 78Aug 05, 80[F04D]

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