Matches 251 - 300 out of 348 < 1 2 3 4 5 6 7 >


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3846328 METHOD FOR SEPARATING SULFIDE PHOSPHOR PARTICLES FROM MIXTURES  
To separate chemically-oxidizable sulfide phosphor particles, such as zinc sulfide and zinc-cadmium sulfide phosphor particles, from a mixture with essentially nonoxidizable phosphor particles,...
3812233 PROCESS FOR SEPARATING CERIUM CONCENTRATE FROM ORES  
A process for separating cerium from the other rare earth values in bastnasite ore by roasting the ore followed by leaching with dilute hydrochlorde acid under carefully controlled conditions.
3791815 PROCESS FOR LANTHANIDE AND ACTINIDE METALS ORE REDUCTION  
The Lanthanide and Actinide series of metals are found mainly in the three ores Monazite, Carnotite, and Uraninite or Pitchblende. In winning these metals from the ores usually the oxides are...
3763049 PROCESS FOR THE CONTINUOUS RECOVERY OF MATERIALS FROM SEA WATER  
An apparatus and process for the recovery of materials from sea water and brine wherein valuable constituents of sea water and brine, such as ionic substances, are recovered by employing an...
3763050 METHOD OF RECOVERING A RARE EARTH PHOSPHOR  
A method of recovering a rare earth phosphor from a mixture which contains this phosphor and at least one sulphide and/or selenide of zinc and/or cadmium. The mixture is treated in an aqueous...
3748095 PRODUCTION OF HIGH PURITY RARE EARTH SULFIDES  
Novel method for the production of high purity metal sulfides, selenides, tellurides, and arsenides, particularly those of high melting point greater than 1,000° C, e.g., such compounds of the...
3710342 RECORDER CHART DRIVE  
A recorder of the type for recording one or more records of the value of one or more conditions under measurement such as temperature, pressure, flow or the like upon a strip chart. A pen, pens, a...
3668143 PREPARATION OF PHOSPHORS BY PRECIPITATION FROM SOLUTION  
Inorganic phosphors are prepared by separately introducing the anions and cations to form the phosphor into a reaction solution; maintaining in the reaction solution, throughout the reaction, an...
3647361 TWO-STAGE COUNTERCURRENT LEACHING PROCESS FOR THE RECOVERY OF PHOSPHATES, YTTRIUM AND RARE EARTH VALUES  
Phosphates and yttrium and rare earth metal values are recovered from solid materials, particularly phosphate ores or commercial concentrates and especially apatites, in a two-stage leaching...
3645682 A PROCESS FOR PRODUCING PHOSPHORIC ACID BY THE USE OF ION EXCHANGE RESINS  
The invention relates to an improved method of ion exchange. The inventive concept involves directly contacting a substantially dry ion exchange resin with a substantially dry material which...
3619128 METHOD FOR PROCESSING RARE EARTH FLUOROCARBONATE ORES  
Rare earth fluorocarbonate ore is processed by digesting the ore in concentrated aqueous alkaline solution at a temperature of between about 100° C. and about 150° C. followed by separating the...
3549523 METHOD FOR EXTRACTING SOLID PARTICLES FROM A LIQUID  
3546202 2,7-BISPHENYLAZOCHROMOTROPIC ACID DIAMIDE DERIVATIVES AND METHOD OF PREPARATION THEREOF  
3515509 PROCESS FOR EXTRACTING AND CONCENTRATING EUROPIUM  
3506585 METHOD FOR RECLAIMING RARE EARTH FLUORESCENT SUBSTANCES  
3492084 PROCESS FOR SEPARATING RARE EARTHS  
3702233 YTTRIUM PURIFICATION  
3692500 PROCESS FOR THE SEPARATION OF ELEMENTS OF THE LANTHANIDE GROUP AND ELEMENTS OF THE TRANSPLUTONIUM GROUP WHICH ARE PRESENT IN AN AQUEOUS SOLUTION  
3721692 PROCESS OF SEPARATING YTTRIUM FROM LANTHANIDES  
3669649 PROCESS FOR RECOVERY OF BERYLLIUM  
3729341 METHOD FOR PRODUCING EPITAXIAL III-V SEMICONDUCTOR LAYERS CONTAINING GALLIUM  
3591516 FUSED SALT PROCESS FOR PRODUCING RARE EARTH OXYHALIDE AND OXIDE LUMINESCENT MATERIALS  
3594117 PROCESS FOR REMOVING CERIUM AND THORIUM FROM THE OTHER RARE EARTH METALS  
3672846 METHOD FOR REPROCESSING SPENT MOLTEN SALT REACTOR FUELS  
3676081 REMOVAL OF TITANIUM FROM MONAZITE ORES  
3558440 METHOD OF SEPARATING THE RARE EARTHS BY FRACTIONAL CO-DISTILLATION OF THEIR VOLATILE CHELATE DERIVATIVES  
3740342 METHOD FOR SEPARATING CHEMICALLYOXIDIZABLE PHOSPHOR PARTICLES FROM MIXTURES WITH ESSENTIALLY NONOXIDIZABLE PHOSPHOR PARTICLES  
3582290 METAL EXTRACTION PROCESS  
3667901 METHOD OF PRODUCING ORTHOVANADATES OF RARE-EARTH METALS  
3804945 PROCESSES FOR EXTRACTING METAL VALUES FROM SOLUTIONS  
3486843 PROCESS FOR SEPARATING EUROPIUM FROM OTHER RARE EARTHS  
3482932 PROCESS FOR SEPARATING YTTRIUM FROM THE LANTHANIDE ELEMENTS  
3474040 PHOSPHOR RECLAMATION  
3473897 METHOD FOR SEPARATING URANIUM AND PROTACTINIUM FROM SPENT MOLTEN FLUORIDE SALT MIXTURES CONTAINING RARE EARTH FISSION PRODUCTS  
3468622 PROCESS FOR RECOVERING RARE EARTH METAL VALUES  
3463619 SOLVENT EXTRACTION PROCESS FOR PURIFYING AMERICIUM AND CURIUM  
3458277 PROCESS FOR THE RECOVERY OF MOLYBDENUM VALUES AS HIGH PURITY AMMONIUM PARAMOLYBDATE FROM IMPURE MOLYBDENUM-BEARING SOLUTION,WITH OPTIONAL RECOVERY OF RHENIUM VALUES IF PRESENT  
3453069 SEPARATION OF RARE EARTH ELEMENTS  
3446576 PROCESS FOR PURIFICATION OF YTTERBIUM  
3429904 SEPARATION OF CHELATES OF RARE EARTH COMPOUNDS AND PROMETHIUM BY FRACTIONAL SUBLIMATION  
3425793 PROCESS FOR FRACTIONATING LANTHANIDE MIXTURES CONTAINING CERIUM  
3420860 METHOD OF RARE-EARTH METAL RECOVERY FROM ORTHOVANADATE COMPOUND  
3413082 Process for recovering zr-values from ores  
3387944 Batch separation of components of a mixture by total solute reflux  
3383182 Separation process of thorium from rare earth metals  
3382048 Method of pretreating metallic hydrides  
3375061 Pyrohydrolytic attack of rare earth fluocarbonate ores  
3369875 Process for treating phosphate ores to obtain metal sulfides and phosphorus sulfides  
3353928 Process for treating rare earth-fluorine materials  
3351424 Separation of cerium from other rare earths  

Matches 251 - 300 out of 348 < 1 2 3 4 5 6 7 >