| Patent Number |
Title Of Patent |
Date Issued |
| 7323016 |
Regulation of a wash column in a melt crystallization process |
Jan. 29, 2008 |
| 6893474 |
Purification process |
May. 17, 2005 |
| 6599332 |
Process for the production of aluminum hydroxide |
Jul. 29, 2003 |
| 6293973 |
Method of controlling oxalate precipitation in bayer process liquor |
Sep. 25, 2001 |
| 6197073 |
Process for producing aluminum oxide beads |
Mar. 6, 2001 |
| 6080210 |
Process for producing aluminum fluoride particles |
Jun. 27, 2000 |
| 5985165 |
Process for the purification of aluminum hydroxide and process for the surface treatment of aluminum plate utilizing the purification process |
Nov. 16, 1999 |
| 5895523 |
Process for making basic alkali metal sulfate pigments |
Apr. 20, 1999 |
| 5871571 |
Inks and UV-opaque protectorants comprising basic sodium and/or sodium/potassium aluminum sulfates and process for making such commercial products |
Feb. 16, 1999 |
| 5837211 |
Compositions and method for foam control in Bayer process |
Nov. 17, 1998 |
| 5759213 |
Method for controlling the size and morphology of alpha-alumina particles |
Jun. 2, 1998 |
| 5728180 |
Adsorbent combinations for enhanced removal of sodium oxalate from bayer process spent liquor |
Mar. 17, 1998 |
| 5720868 |
Method for producing electrolytic-pot-cell grade alumina from aluminum sulphate |
Feb. 24, 1998 |
| 5707406 |
Method of manufacturing aluminum fluoride anhydride |
Jan. 13, 1998 |
| 5690700 |
Process for the precipitation of aluminum trihydroxide from a supersaturated sodium aluminate solution |
Nov. 25, 1997 |
| 5662880 |
Method for producing catalyst-grade alumina from aluminum sulphate |
Sep. 2, 1997 |
| 5663478 |
Recovery of aluminum and/or fluoride values from used aluminum chlorofluorides |
Sep. 2, 1997 |
| 5558847 |
Process for recovering aluminium and fluorine from fluorine containing waste materials |
Sep. 24, 1996 |
| 5500480 |
Process for the production of an aluminum hydroxide Al(OH).sub.3 having rounded grain surfaces |
Mar. 19, 1996 |
| 5492542 |
Process for the production of an aluminum hydroxy Al(OH).sub.3 having rounded grain surfaces |
Feb. 20, 1996 |
| 5385586 |
Liquor oxalate stabilizers |
Jan. 31, 1995 |
| 5364418 |
Process for compacting silver nitrate |
Nov. 15, 1994 |
| 5312603 |
Using polyglycerines in the Bayer process to increase crystal size of the product |
May. 17, 1994 |
| 5275628 |
Compositions and method for foam control and crystal modification in Bayer process |
Jan. 4, 1994 |
| 5273619 |
Method for producing mono-crystalline alumina grains |
Dec. 28, 1993 |
| 5194243 |
Production of aluminum compound |
Mar. 16, 1993 |
| 5164263 |
Aluminum nitride flakes and spheres |
Nov. 17, 1992 |
| 5163973 |
Process for producing low soda alumina |
Nov. 17, 1992 |
| 5158577 |
Process for precipitating alumina from Bayer process liquor |
Oct. 27, 1992 |
| 5127950 |
Short-prismatic aluminum hydroxide, process for preparing same from supersaturated sodium aluminate-liquor, and compositions containing same |
Jul. 7, 1992 |
| 5106599 |
Alumina crystal growth additive |
Apr. 21, 1992 |
| 5102426 |
Process for precipitating alumina from bayer process liquor |
Apr. 7, 1992 |
| 4997454 |
Method for making uniformly-sized particles from insoluble compounds |
Mar. 5, 1991 |
| 4978509 |
Lamella settler crystallizer |
Dec. 18, 1990 |
| 4925454 |
Aluminum chloride granules and process to obtain them |
May. 15, 1990 |
| 4908197 |
Aluminum nitride flakes and spheres |
Mar. 13, 1990 |
| 4900537 |
Control of form of crystal precipitation of aluminum hydroxide using cosolvents and varying caustic concentration |
Feb. 13, 1990 |
| 4882140 |
Solid aluminum hydroxide compositions |
Nov. 21, 1989 |
| 4822593 |
Control of form of crystal precipitation of aluminum hydroxide using cosolvents and varying caustic concentration |
Apr. 18, 1989 |
| 4681697 |
Process for producing solid aluminum chloride compositions |
Jul. 21, 1987 |
| 4678477 |
Process for lowering level of contaminants in Bayer liquor by membrane filtration |
Jul. 7, 1987 |
| 4617179 |
Process for effecting seeding in two phases for producing large-grain alumina |
Oct. 14, 1986 |
| 4595581 |
Boehmite production by precipitation from sodium aluminate solution at elevated temperatures |
Jun. 17, 1986 |
| 4574001 |
Process for producing finely divided dispersions of metal oxides in aluminum hydroxide |
Mar. 4, 1986 |
| 4574074 |
Process for the production of aluminum trihydroxide having a medium of less than 4 microns, which can be varied as required |
Mar. 4, 1986 |
| 4568527 |
Utilization of partially calcined alumina as precipitation aid in the Bayer process |
Feb. 4, 1986 |
| 4559220 |
Crystallization of polyaluminium hydroxide complexes |
Dec. 17, 1985 |
| 4533572 |
Process for producing varnish-bonded carbon-coated metal granules |
Aug. 6, 1985 |
| 4530699 |
Dense phase precipitation |
Jul. 23, 1985 |
| 4525171 |
Gradient process of growing crystals from liquid media |
Jun. 25, 1985 |
