Fospur Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5304317 Froth flotation of fine particlesExpiredNov 23, 92Apr 19, 94[B03D]
5217604 Froth flotation of fine particlesExpiredMar 25, 92Jun 08, 93[B03D]
5122290 Froth flotation of calcium borate mineralsExpiredFeb 06, 91Jun 16, 92[B03D]
5051199 Froth flotation of mineral finesExpiredSep 20, 89Sep 24, 91[B03D]
4956077 Froth flotation of mineral finesExpiredOct 21, 88Sep 11, 90[B03D]
4859318 Recovering coal finesExpiredOct 16, 87Aug 22, 89[B03D]
4857221 Recovering coal finesExpiredAug 12, 88Aug 15, 89[B03D]

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