359. CHEMISCHE FABRIK VONN HEYDEN A. G. [Thorium Oxide.] French Patent 828,334, May 16, 1938. Chem. Abs., vol. 33, 1939. p. 330.

Patent Abstracts

Th Oxide having particularly good reactional properties is made by heating complex salts containing Th oxalate to 285º-450º. The heating is continued until the oxide dissolves in some hours in 3-4 times the amount of boiling concentrated HNO₃.

See abs. 2432.