Mineral Deposits Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4836926 Staggered spiral splittersExpiredJul 17, 87Jun 06, 89[B03B]
4795553 Spiral separatorExpiredNov 17, 82Jan 03, 89[B03B]
4758334 Continuous feed and discharge mineral concentrator with riffles angled relative to a longitudinal axisExpiredJul 16, 86Jul 19, 88[B03B]
4747943 Splitter assemblyExpiredJul 30, 86May 31, 88[B03B]
4614580 Spiral separatorExpiredDec 21, 84Sep 30, 86[B03B]
4597861 Spiral separatorExpiredDec 07, 84Jul 01, 86[B03B]
4553673 Method and apparatus for obtaining undercuts of concentrates from pulp flow in spiral separatorsExpiredNov 02, 82Nov 19, 85[B03B]
4545900 Spiral separatorsExpiredSep 24, 82Oct 08, 85[B03B]
4505811 Mineral processing apparatusExpiredOct 14, 83Mar 19, 85[B03B]
4476980 Spiral separatorExpiredNov 17, 82Oct 16, 84[B03B]
4384650 Spiral separatorExpiredApr 02, 81May 24, 83[B07C]
4324334 Spiral separatorsExpiredMay 21, 81Apr 13, 82[B03B]
4277330 Spiral separatorsExpiredJan 29, 80Jul 07, 81[B03B]
4209386 Method and apparatus for the wet gravity concentration of oresExpiredNov 21, 77Jun 24, 80[B03B]
4189378 Spiral separatorsExpiredJul 07, 78Feb 19, 80[B03B]
4183806 Gravitational separator employing an improved eluent supply systemExpiredNov 17, 77Jan 15, 80[B03B]

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