FREEPORT-MCMORAN SULFUR INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5340383 Reduction of particulate sulfur emissions from liquid sulfur storage tanksExpiredNov 12, 93Aug 23, 94[B01D]
5114699 Spent alkylation acid treatment processExpiredApr 12, 89May 19, 92[C01B]
5096571 Recovery of sulfur from native oresExpiredDec 12, 89Mar 17, 92[B03D]
4869555 Apparatus for recovery of sulfurExpiredJan 06, 88Sep 26, 89[E21B, E21C]
4722832 Sulfur recovery processExpiredAug 27, 86Feb 02, 88[C01B]
4671833 Process for applying a heat-shrinkable material over sulfur well pipingExpiredSep 24, 84Jun 09, 87[B32B]
4345785 Dielectric pipe coupling for use in high temperature, corrosive environmentsExpiredOct 20, 80Aug 24, 82[F16L]
4241953 Sulfur mine bleedwater reuse systemExpiredApr 23, 79Dec 30, 80[E21B]

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