Alexander Friedrich Just (12 April 1874 in Bremen – 30 May 1937 in Budapest) was an Austro-Hungarian chemist and inventor. Later, in Hungary he used the name Just Sándor Frigyes. In 1904 with Austro-Hungarian Franjo Hanaman he was the first to develop and patent an incandescent light bulb with a tungsten filament, made by extruding a paste of tungsten powder and a carbonaceous binder to produce a fine thread, then removing the carbon by heating in an atmosphere of hydrogen and water vapor. Just and Hanaman received a Hungarian patent in 1904, and later US Patent 1,018,502. In 1905, Just and Hanaman patented a process for producing tungsten filaments by plating carbon filaments with tungsten, then removing the carbon by heating. These early tungsten lamps were more efficient than a carbon filament lamp, because they could operate at a high temperature, due to the high melting point of tungsten. The tungsten was, however, so brittle that these lamps were of limited practical use. It was supplanted by the drawn tungsten filament lamp, developed in 1910 by William David Coolidge.
- US patent 1018502, Just, Alexander & Hanaman, Franz, "INCANDESCENT BODIEs FOR ELECTRIC LAMPS", issued 1912-02-27
- Coolidge, W. D. (1912). "Metallic Tungsten and Some of its Applications". Transactions of the American Institute of Electrical Engineers. XXXI (1): 1220. doi:10.1109/T-AIEE.1912.4768477. ISSN 0096-3860. 
- Hirst, H. "Recent progress in tungsten metallic filament lamps," The Electrical Journal, Volume LXI, May 22, 1908, pages 215-216. Retrieved December 14, 2011
- Day, Lance and McNeil, Ian "Biographical dictionary of the history of technology," Routledge, 1996. Cited edition is Taylor & Francis eBook, 2005, page 290. ISBN 978-0-203-20131-2.[better source needed] Retrieved December 14, 2011.