TEXASGULF INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4547295 Filtration of wet process superphosphoric acidExpiredDec 07, 83Oct 15, 85[C01B]
4479790 Centrifugal separator and method of operating sameExpiredApr 22, 83Oct 30, 84[B04B]
4477573 Sulphur gas geochemical prospectingExpiredMay 28, 82Oct 16, 84[G01N]
4425003 Single well-multiple cavity solution mining of an inclined structureExpiredNov 04, 81Jan 10, 84[E21B]
4418960 Multiple-bed solution mining of an inclined structureExpiredNov 04, 81Dec 06, 83[E21B]
4411474 Solution mining of an inclined structureExpiredMay 20, 81Oct 25, 83[E21B]
4404062 CondenserExpiredMar 22, 82Sep 13, 83[B01D]
4395828 Combination geodetic transit compass and signal mirrorExpiredJul 10, 80Aug 02, 83[G01C]
4389380 Multiple-stage thermal beneficiation process for phosphate oresExpiredJan 12, 82Jun 21, 83[C01B, C01F]
4381834 Modular chutingExpiredMay 20, 81May 03, 83[B65G]
4377640 Sulphur gas geochemical prospectingExpiredMay 20, 81Mar 22, 83[G01N]
D268011 Desk chronometerExpiredOct 09, 80Feb 22, 83[D100]
4353260 Shield for gas sampling probeExpiredSep 30, 80Oct 12, 82[G01N]
4314978 Increased production of wet process phosphoric acid by gelatin additionExpiredJan 29, 81Feb 09, 82[C01B]
4289612 Phosphate ore triple floatExpiredJun 11, 80Sep 15, 81[B03D]
4268088 Shortwall mining of tronaExpiredOct 01, 79May 19, 81[E21C]
4202667 Process for the separation of insoluble materials in the production of soda ashExpiredAug 16, 78May 13, 80[B01D]

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