Svenska Traforskningsinstitutet

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4935366 Method of obtaining cellulase deficient strains of white-rot fungiExpiredMay 16, 86Jun 19, 90[C12R, C12N, D21C]
4874467 Method of controlling cross profile of properties of paper webExpiredAug 14, 87Oct 17, 89[D21F]
4824523 Method of making paper with high filler contentExpiredJun 01, 87Apr 25, 89[D21H]
4806014 Method for measuring size distributionExpiredOct 19, 87Feb 21, 89[G01N]
4786365 Process of making cellulose pulp with a sulphite cooking liquor containing sulphide and a quinone or hydroquinone compoundExpiredFeb 16, 88Nov 22, 88[D21C]
4775307 Apparatus for producing layers of dry fibres on a forming surfaceExpiredAug 05, 86Oct 04, 88[B28B]
4689988 Device for separately measuring particles in a suspensionExpiredOct 15, 85Sep 01, 87[G01N]
4690634 Method of measuring dry substance in flue gasesExpiredMay 22, 86Sep 01, 87[F23M, F23C]
4683841 Control of a black liquor recovery boilerExpiredMar 06, 86Aug 04, 87[F22B, D21C]
4655093 Web tension measuring method and deviceExpiredJul 16, 85Apr 07, 87[G01H, G01L]
4624819 Method for producing layers of dry fibres on a forming surfaceExpiredDec 07, 84Nov 25, 86[D04H]
4529309 Method for determining the average radius and/or the average length of particles carried by a flowing mediumExpiredSep 28, 82Jul 16, 85[G01N]
4514257 Method of measuring fines in pulp suspensionsExpiredMar 12, 82Apr 30, 85[G01N]
4448818 Method and apparatus for applying liquid to a moving surfaceExpiredSep 28, 81May 15, 84[B05D]
4420256 Dust measurementExpiredFeb 12, 81Dec 13, 83[G01N]
4362600 Use of polyalkylene oxides for the separation of cellulose fibresExpiredAug 12, 81Dec 07, 82[D21C]
4346007 Method at screening apparatus for cleaning the apertures in a screen plate and device for carrying out the methodExpiredSep 02, 80Aug 24, 82[B01D]
4318180 Method and apparatus for indicating the size distribution of particles in a flowing mediumExpiredJun 11, 79Mar 02, 82[G01N, G06G]
4255870 Method of hot-air dryingExpiredOct 11, 79Mar 17, 81[F26B]
4250935 Method and an apparatus for cross-cutting treesExpiredNov 30, 78Feb 17, 81[B27L]

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