| 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 |
