CH62394A
(en )
1913-11-17
Process for extracting iron and copper from chalcopyrite
FR473964A
(en )
1915-02-03
Wet copper extraction process
FR444983A
(en )
1912-10-30
Method and apparatus for nodulation of fine iron ores, and the like
CH63755A
(en )
1914-02-16
Process for extracting zinc from blende
FR413170A
(en )
1910-08-02
Process for ore reduction
FR10737E
(en )
1909-09-10
Process for the direct extraction of iron from ore
FR494209A
(en )
1919-09-03
Process for reducing iron ores and apparatus for carrying out this process
FR474132A
(en )
1915-02-09
Process for smelting iron ores
FR467583A
(en )
1914-06-15
Process for hardening copper
FR442517A
(en )
1912-09-03
Process for sintering oxidized ores
FR412724A
(en )
1910-07-21
Process for the extraction of copper from low grade ores
CH63753A
(en )
1914-02-16
Process for extracting tin from cassiterite
FR476218A
(en )
1915-07-20
Advanced process for extracting metals from ores
FR361957A
(en )
1907-01-11
Process for binding iron ores
FR440712A
(en )
1912-07-19
Process for the extraction of copper from sulphide ores, and other materials
FR406776A
(en )
1910-02-10
Advanced process for melting metals
FR494514A
(en )
1919-09-11
Process for extracting zinc from its ores
FR347840A
(en )
1905-03-24
Process for the separation of copper, especially its poor ores
CH63754A
(en )
1914-02-16
Process for extracting zinc from scale
FR458028A
(en )
1913-10-01
Process for the extraction of sulfur from pyrites
FR475770A
(en )
1915-06-14
Advanced process for the electrolysis of iron
FR518943A
(en )
1921-06-02
Method for cable identification
CH42566A
(en )
1909-02-01
Process for extracting iron from bauxite
FR412984A
(en )
1910-07-28
Advanced process for the separation of complex ores
DK13682C
(en )
1910-09-12
Procedure for Extraction of the Copper from Copper-Roasted Sulfur Ore While Simultaneously Ferrous Sulphate Extraction