| Patents for C01G 21 - Compounds of lead (978) |
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| 07/18/1990 | CN1008809B Method to produce lead hydroxide and tri-and tetra-valent lead sulfate |
| 07/11/1990 | CN1043686A Process for preparing chrome yellow with galena and chromite |
| 06/27/1990 | EP0375245A1 Method and apparatus for making highly oxidized lead powder |
| 06/26/1990 | US4937213 Process for preparing titanates and zirconates |
| 05/16/1990 | EP0368765A2 Oxide superconducting material and process for preparing the same |
| 05/11/1990 | CA2002843A1 Oxide superconducting material and process for preparing the same |
| 05/03/1990 | WO1990004573A1 Superconducting metal oxide compositions and processes for manufacture and use |
| 04/26/1990 | CA2001422A1 Superconducting metal oxide compositions and processes for manufacture and use |
| 04/25/1990 | EP0365260A2 Apparatus and method for the production of oxides of lead |
| 03/27/1990 | US4912301 Apparatus and method for the production of oxides of lead |
| 03/21/1990 | CN1040572A Manufacturing method for ceramics and products thereof |
| 03/07/1990 | EP0356958A2 Process for the complete burning of litharge |
| 02/22/1990 | WO1990001461A1 Superconducting metal oxide compositions and processes for manufacture and use |
| 02/06/1990 | CA1265535A1 Removal of impurities from amines |
| 01/16/1990 | US4894361 Superconducting metal oxide Tl-Pb-Ca-Sr-O compositions and processes for manufacture and use |
| 12/26/1989 | US4889706 Method of manufacturing fine powder of lead stannate |
| 11/14/1989 | US4880771 Multilayer perovskite crystal structure |
| 10/04/1989 | EP0335310A2 Formation of superconducting metal oxide film by pyrolysis |
| 09/13/1989 | EP0332447A1 Selective removal of metal cations from aqueous effluent solutions |
| 09/13/1989 | EP0332291A1 Devices and systems based on novel superconducting material |
| 09/06/1989 | EP0146634B1 Process for producing fine lead stannate particles |
| 08/22/1989 | US4859787 Process for the preparation of dialkyldithiocarbamates of multivalent metals |
| 08/15/1989 | US4857293 Reacting metal oxide and aqueous hydrofluoric acid |
| 08/09/1989 | EP0205453B1 Process for the preparation of ultrapure heavy metal fluorides |
| 07/19/1989 | EP0324619A1 Improved process for preparing crystalline mixed metal oxides |
| 07/05/1989 | EP0323178A2 Methods for producing high temperature superconducting materials |
| 06/20/1989 | CA1255876A1 Process for the manufacture of hydrated oxides and tri- and tetra- basic lead sulphates |
| 06/07/1989 | EP0319086A1 Pentabasic lead fumarate |
| 05/30/1989 | US4835077 Silver oxide |
| 05/17/1989 | EP0316009A2 Oxide superconductor |
| 04/11/1989 | US4820669 Ammonium hydroxide causes precipitation of hydroxides of lead, titanium, zirconium; purification, calcining |
| 03/15/1989 | EP0306973A2 Manufacturing method for superconducting ceramics and products thereof |
| 03/14/1989 | US4812426 Lead-containing oxide powder |
| 03/08/1989 | EP0306334A2 Macrocyclic ligands bonded to silica or silica gel and their use in selectively and quantitatively removing and concentrating ions present at low concentrations from mixtures thereof with other ions |
| 03/01/1989 | EP0198857B1 Process for producing titanates and zirconates |
| 01/24/1989 | US4800069 Haliding a metal ferrite |
| 01/10/1989 | CA1248324A1 Process for producing ago cathode material |
| 11/30/1988 | EP0292851A2 Stable divalent silver oxide-containing cathode material |
| 11/02/1988 | EP0288819A1 Process for the preparation of dialkyldithiocarbamates of polyvalent metals |
| 09/22/1988 | DE3707615A1 New superconducting mixed oxides |
| 09/21/1988 | EP0282619A1 Filiform corrosion-resistant primer coating composition and method for preventing filiform corrosion |
| 08/02/1988 | US4761188 Coating with hydrotalcite solid solutions |
| 07/19/1988 | CA1239272A1 Process for manufacturing halide glasses |
| 05/31/1988 | US4747957 Brine treatment using ethylene carboxylic acid polymers |
| 05/31/1988 | US4747954 Ethylene-unsaturated acid copolymer |
| 05/04/1988 | EP0163666B1 Treatment of dross |
| 03/22/1988 | EP0190226A4 Process for the manufacture of hydrated oxides and tri- and tetra- basic lead sulphates. |
| 03/15/1988 | US4731187 Removal of heavy metals from waste water |
| 03/02/1988 | EP0257432A2 Vinyl chloride resin composition |
| 02/02/1988 | CA1232141A1 Treatment of dross |
| 12/15/1987 | US4713229 Removing heavy metals; diorganyl dithiophosphoric acid ester, adsorbent, reductant |
| 12/08/1987 | US4711652 Reacting an organometallic compound and an organic halide or interhalide at low temperatures and vitrifying; by-product volatility |
| 11/03/1987 | US4704260 Lead removal method |
| 07/08/1987 | EP0227893A2 Method of removing metal contaminants from solutions |
| 07/07/1987 | US4678507 Treatment of dross |
| 06/16/1987 | US4673561 Process for the manufacture of hydrated oxides and tri- and tetra- basic lead sulphates |
| 04/28/1987 | US4661634 Filtration through porous polymer particles in fiber form |
| 04/21/1987 | CA1220611A1 Electrochemical elimination of nickel, antimony, arsenic and tin from a lead chloride solution |
| 02/25/1987 | EP0211305A2 Metal scavenging process |
| 02/25/1987 | CN85105914A Method to produce lead hydroxide and tri-and tetra-valent lead sulfate |
| 02/17/1987 | US4643984 Process for producing a composition which includes perovskite compounds |
| 12/30/1986 | EP0205453A1 Process for the preparation of ultrapure heavy metal fluorides. |
| 11/12/1986 | CA1213735A1 Chlorination of copper, lead, zinc, iron, silver and gold |
| 10/29/1986 | EP0198857A1 Process for producing titanates and zirconates. |
| 10/21/1986 | US4618478 Apparatus for the production of lead oxide |
| 10/08/1986 | EP0196666A1 Process for manufacturing halides to be used for producing halide glasses |
| 08/13/1986 | EP0190226A1 Process for the manufacture of hydrated oxides and tri- and tetra- basic lead sulphates |
| 07/17/1986 | WO1986004049A1 Process for the preparation of ultrapure heavy metal fluorides |
| 04/30/1986 | EP0179242A2 Process for the purification of phosphoric acid |
| 04/24/1986 | WO1986002345A1 Process for producing titanates and zirconates |
| 03/18/1986 | US4576812 Chlorination of copper, lead, zinc, iron, silver and gold |
| 02/13/1986 | WO1986000878A1 Process for the manufacture of hydrated oxides and tri- and tetra- basic lead sulphates |
| 01/21/1986 | CA1199502A1 Hydrometallurgical method for recovering metal materials from spent lead-acid storage batteries |
| 01/07/1986 | CA1199059A1 Lead acid electric storage cell and a positive electrode therefor |
| 12/31/1985 | US4561887 Process for recovering metals from solution through solvent extraction and pyrometallurgical reduction |
| 12/03/1985 | US4556422 Brine leaching under pressure |
| 10/29/1985 | CA1195846A1 Recovery of zinc from zinc-containing sulphidic material |
| 10/22/1985 | US4548793 Electrochemical elimination of nickel from lead containing chloride solutions |
| 10/08/1985 | US4545964 Process for the preparation of porous products based on cobalt fluoride or lead fluoride |
| 09/17/1985 | CA1193421A1 High surface area lead oxide composite and method for making the same |
| 09/17/1985 | CA1193420A1 Method of synthesizing high surface area unagglomerated noble metal pyrochlore compounds |
| 08/20/1985 | US4536385 Method and apparatus for the production of industrial lead oxide |
| 07/24/1985 | EP0148842A1 Method and apparatus for the production of lead oxide |
| 07/23/1985 | CA1190720A1 Process for removing heavy metal ions and arsenic from wet-processed phosphoric acid |
| 07/03/1985 | EP0146634A1 Process for producing fine lead stannate particles |
| 06/04/1985 | US4521399 Method and apparatus for the production of lead oxide |
| 05/28/1985 | US4519986 Treating thorium oxide with hydrofluoric acid and exposing the hydrate formed with fluoride compound |
| 05/23/1985 | WO1985002204A1 Treatment of dross |
| 04/09/1985 | CA1185073A1 Method and apparatus for the production of industrial lead oxide |
| 04/02/1985 | US4508688 Method of regenerating acetate in a metal removal process |
| 12/20/1984 | WO1984004911A1 Process for producing fine lead stannate particles |
| 11/08/1984 | WO1984004292A1 Method and apparatus for the production of lead oxide |
| 10/30/1984 | US4479924 With diorganyldithiophosphoric acid and adsorbent |
| 10/24/1984 | EP0122781A1 Corrosion inhibitors, methods of producing them and protective coatings containing them |
| 09/12/1984 | EP0117902A1 Process for producing divalent silver oxide cathode material |
| 08/21/1984 | US4466948 Process for removing heavy metal ions and arsenic from wet-processed phosphoric acid |
| 08/21/1984 | CA1172826A1 Thermostable lead carbonate, process for its manufacture and articles of thermoplastic and elastic polymers pigmented therewith |
| 08/01/1984 | EP0114767A2 Electrochemical removal of nickel, antimonium, arsenicum and tin from a lead chloride solution |
| 07/17/1984 | US4460442 Precipitation of lead and lead oxide with base, dissolving in fluoboric acid and electrolysis to recover lead |
| 07/03/1984 | US4457812 Preferential extraction of metal halide with nonmetal halide |