Beschreibung     Ansprüche     Zeichnung  

DES1244141A   [0007] 
DE19628816A   [0007] 
DE19724183C   [0007] 
US4115513A   [0007] 
GB1011688A   [0038] 

Anionexchange method for preparation of ammonium paratungstate from soda solutions   [0007] 
Use of extraction by amines during the preparation of ammonium paratungstate   [0007] 
New process for production of high purity ammonium paratungstate from tungsten siimes with high content of impurities   [0007] 
Preparation of Ammonium Paratungstate from a Sodium Tungstate-Sodium Chloride Phase   [0007] 
TUNGSTEN Properties Chemistry   [0007] 
Löslichkeit und stabile Kristallhydrate im System Ammoniumparaolframat-Wasser   [0009]