| Patent Number |
Title Of Patent |
Date Issued |
| 5891412 |
Ceric oxide particulates having improved morphology |
April 6, 1999 |
| Ceric oxide particulates having a specific surface of at least 190 m.sup.2 /g, measured after calcination at a temperature of from 350.degree. to 450.degree. C., and a specific surface of at least 15 m.sup.2 /g after calcination at 800.degree. C., are prepared by (a) suspending, in an |
| 5518703 |
Production of finely divided rare earth ammonium oxalates/finely divided rare earth oxides |
May 21, 1996 |
| Very finely divided ammonium rare earth double oxalates, readily converted into corresponding rare earth oxides by calcination, such oxides being well adopted, e.g., for the production of luminescent compounds therefrom, are prepared by (a) admixing a second solution of a rare earth comp |
| 5338520 |
Recovery of neodymium/didymium values from bastnaesite ores |
August 16, 1994 |
| Neodymium or didymium values are selectively recovered from bastnaesite ores, essentially to the exclusion of cerium and trace amounts of thorium, by (i) calcining the bastnaesite ore, (ii) selectively leaching the calcined bastnaesite with an aqueous solution of nitric acid to solubiliz |
| 5279789 |
Ceric oxide particulates having improved morphology |
January 18, 1994 |
| Ceric oxide particulates having a specific surface of at least 190 m.sup.2 /g, measured after calcination at a temperature of from 350.degree. to 450.degree. C., and a specific surface of at least 15 m.sup.2 /g after calcination at 800.degree. C., are prepared by (a) suspending, in an |
| 5174984 |
Ceric oxide with new morphological characteristics and method for obtaining same |
December 29, 1992 |
| A ceric oxide having a specific surface of at least 15 m.sup.2 /g, measured after calcination at a temperature of between 800.degree. and 900.degree. C. |
| 5064628 |
Novel ceric oxides and preparation thereof |
November 12, 1991 |
| Provided is a ceric oxide having a specific surface of at least 85 m.sup.2 /g after calcination between 350.degree. and 550.degree. C., and being further characterized in that it has a pore volume of at least 0.15 cm.sup.3 /g and a median pore diameter greater than 50 .ANG.. The ceric |
| 5035834 |
Novel cerium (IV) compounds |
July 30, 1991 |
| Novel cerium (IV) compounds having the Formula (I):can be directly dispersed in water to produce unique colloidal dispersions thereof. |
| 5026421 |
Polishing compositions based on cerium and process for the preparation thereof |
June 25, 1991 |
| An improved glass polishing composition that contains ceric oxide and a boron compound. A process for the preparation of this composition is also disclosed. The polishing composition has improved suspension properties while still maintaining a high polishing efficiency. |
| 5023070 |
Process for obtaining a ceric oxide |
June 11, 1991 |
| The present invention concerns a process for obtaining a ceric oxide, and, more precisely, a process for increasing and stabilizing at high temperature the specific surface area of a ceric oxide. The invention process, which consists of the preparation of a ceric oxide by calcination |
| 5013534 |
Morphologically improved rare earth trifluorides |
May 7, 1991 |
| Morphologically improved, aggregated, monodispersed rare earth trifluoride particulates having a controlled and narrow grain size distribution, and a mean diameter of less than 1 .mu.m, are prepared by (i) reacting an aqueous solution of a rare earth salt with a solution of ammonium |
| 5011671 |
Ceric oxide with new morphological characteristics and method for obtaining same |
April 30, 1991 |
| The object of the present invention is a ceric oxide with new morphological characteristics. The invention also relates to one of the methods for obtaining said oxide.The method of the invention is characterized by the fact that a ceric hydroxide, prepared by base precipitation using a s |
| 5002747 |
Process for obtaining ceric oxide |
March 26, 1991 |
| The present invention concerns a process for obtaining a ceric oxide having a large specific surface area.The process according to the invention consists of subjecting a ceric hydroxide prepared by hydrolysis of a cerium IV salt solution, to solvothermal treatment prior to calcination.Th |
