Grasso's Koninklijke Machinefabrieken N.V.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5273412 Lubricated rotary compressor having a cooling medium inlet to the delivery portExpiredMay 06, 93Dec 28, 93[F04C, F25B]
5102544 Apparatus for continuously removing crystals from a mother liquor and for washing the crystalsExpiredDec 11, 89Apr 07, 92[B01D]
5062862 Process and apparatus for recovering a pure substance from a liquid mixture by crystallizationExpiredSep 05, 89Nov 05, 91[C07C, B01D]
4776175 Method and apparatus for the automatic periodical discharge of non-condensable gases from the circuit of a compression refrigeration machineExpiredAug 19, 87Oct 11, 88[F25B]
4762622 Apparatus and process for separating solid particles from a liquid suspension and/or for the purification or leaching of solid particlesExpiredAug 10, 87Aug 09, 88[E01D]
4557741 Gradient column freeze concentration systemExpiredFeb 13, 84Dec 10, 85[B01D]
4459144 Multi-stage counter-current concentration system and methodExpiredFeb 18, 82Jul 10, 84[B01D]
4430104 Multi-stage countercurrent concentrating system and method and separatorExpiredJul 19, 82Feb 07, 84[B01D]
4316368 Multi-stage counter-current concentrating methodExpiredOct 30, 80Feb 23, 82[B01D]

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