Aluminum Manufacture
Patents and Inventions
Charles Martin Hall in 1886 (US patent 400,664)

An inexpensive method for producing aluminium was first introduced by Charles Martin Hall in 1886 (US patent 400,664).

Title Primary Class Description Inventor Assignee Issue Date Patent No.
Process of Reducing Aluminium from Its Fluoride Salts by Electrolysis 205/385 An electric current passing through a bath of alumina (Aluminium oxide) dissolved in cryolite (ore of aluminium), which results in a puddle of aluminum forming in the bottom of the retort (electrolytic method). Charles M. Hall
April 2, 1889 US400,664
Manufacture of Aluminium 205/395 Improvement upon patent No. 400,665. Enabling the continuous production of aluminium without interruption and removing the need for increasing the current and voltage concerning the electrolytic process. (see also US patent No. 400,666) Charles M. Hall
April 2, 1889 US400,665
Process of Obtaining Metals from Their Ores or Compounds by Electrolysis 205/372 The fusing and decomposing of cryolite (ore of aluminium) by an electric arc and passing a current through the ore. The Patent Office rejected Bradley's application on the basis of prior art. After a few more rejections the patent was finally issues on Dec. 8, 1891. Interestingly, this application was submitted three years before Hall produced his first aluminum. Charles S. Bradley
December 8, 1891 US464,933

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