James C. Barber and Associates Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6921520 Process for upgrading raw phosphate oreExpiredOct 07, 02Jul 26, 05[C01B]
6169222 Remediation of soil polluted with phosphorus-containing wastesExpiredJun 14, 99Jan 02, 01[C01B]
6051201 Preparation of phosphatic feedstock from phosphorus-containing wasteExpiredJun 25, 98Apr 18, 00[C01B]
4968499 Conversion of precipitator dust into phosphorus furnace feedstockExpiredOct 13, 89Nov 06, 90[C01B, C05B]
4919906 Processes and equipment for production of elemental phosphorus and thermal phosphoric acidExpiredJun 03, 88Apr 24, 90[C01B]
4765822 Recovery of fluorine from waste gasesExpiredJun 17, 85Aug 23, 88[C05B]
4670240 Energy conservation during the smelting of oresExpiredApr 29, 85Jun 02, 87[C22B, C01B]
4656020 Production of phosphorus and phosphoric acidExpiredAug 07, 85Apr 07, 87[C01B]
4649035 Production of phosphorus and phosphoric acidExpiredAug 07, 85Mar 10, 87[C01B]
4623528 Recovery of fluorine from waste gasesExpiredJun 17, 85Nov 18, 86[C01B]
4619819 Phosphoric acid compositionExpiredJun 10, 83Oct 28, 86[C01B]
4613494 Recovery of fluorine from waste gasesExpiredJan 08, 85Sep 23, 86[C01B, C01D]
4608241 Production of phosphorus and phosphoric acidExpiredApr 29, 85Aug 26, 86[C01B]
4537615 Fertilizer from phosphorus furnace waste streamExpiredJun 10, 83Aug 27, 85[C05B]
4529439 Energy conservation during the smelting of oresExpiredSep 17, 84Jul 16, 85[C22B]
4514366 Production of fluid fertilizer from phosphorus furnace waste streamExpiredJun 10, 83Apr 30, 85[C01B]
4451277 Production of fluid fertilizer from phosphorus furnace waste streamExpiredSep 30, 82May 29, 84[C05B]
4421521 Process for agglomerating carbon particlesExpiredSep 08, 81Dec 20, 83[C01B, C10L]
4383847 Production of fluid fertilizer from phosphorus furnace waste streamExpiredSep 11, 81May 17, 83[C05B]
4373893 Bench scale drum agglomerator and power meansExpiredOct 29, 81Feb 15, 83[B22F]

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