# Fame.am profile — machine-readable export
# Canonical URL: https://fame.am/person/alexander-just
# Generated: 2026-08-13T16:53:02.142Z

schema: https://schema.org/Person
url: "https://fame.am/person/alexander-just"
name: "Alexander Just"
slug: "alexander-just"
description: "Alexander Friedrich Just 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 vapors. 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."
tagline: "German-Hungarian chemist"
image: "https://commons.wikimedia.org/wiki/Special:FilePath/Dr._Just_S%C3%A1ndor_egyik_utols%C3%B3_k%C3%A9pe.jpg?width=1200"
gender: "male"
category:
  name: "Scientists"
  slug: "scientists"
profileType:
  name: "Scientist"
  slug: "scientist"
  entityType: "https://www.wikidata.org/entity/Q39631"
birthDate: "1874-04-12"
deathDate: "1937-05-30"
livingStatus: "DECEASED"
scores:
  popularity:           40.29
  momentum:             3.709472345835983
  historical:           8.071130666666667
  currentAttention:     0
  sourceConfidence:     50.00000000000001
  profileCompleteness:  60
  trendDirection:       "RISING"
ranks:
  global:   null
  country:  null
  category: null
sources:
  - url: "https://uk.wikipedia.org/wiki/%D0%A8%D0%B0%D0%BD%D0%B4%D0%BE%D1%80_%D0%AE%D1%81%D1%82"
    title: "Шандор Юст"
    type:  "WIKIPEDIA"
  - url: "https://ar.wikipedia.org/wiki/%D8%A7%D9%84%D9%83%D8%B3%D9%86%D8%AF%D8%B1_%D8%AC%D8%A7%D8%B3%D8%AA"
    title: "الكسندر جاست"
    type:  "WIKIPEDIA"
  - url: "https://de.wikipedia.org/wiki/Alexander_Just"
    title: "Alexander Just"
    type:  "WIKIPEDIA"
  - url: "https://en.wikipedia.org/wiki/Alexander_Just"
    title: "Alexander Just"
    type:  "WIKIPEDIA"
  - url: "https://eo.wikipedia.org/wiki/S%C3%A1ndor_Just"
    title: "Sándor Just"
    type:  "WIKIPEDIA"
  - url: "https://es.wikipedia.org/wiki/Alexander_Just"
    title: "Alexander Just"
    type:  "WIKIPEDIA"
  - url: "https://fa.wikipedia.org/wiki/%D8%A7%D9%84%DA%A9%D8%B3%D8%A7%D9%86%D8%AF%D8%B1_%DB%8C%D9%88%D8%B3%D8%AA"
    title: "الکساندر یوست"
    type:  "WIKIPEDIA"
  - url: "https://hu.wikipedia.org/wiki/Just_S%C3%A1ndor"
    title: "Just Sándor"
    type:  "WIKIPEDIA"
  - url: "https://ru.wikipedia.org/wiki/%D0%AE%D1%81%D1%82%2C_%D0%A8%D0%B0%D0%BD%D0%B4%D0%BE%D1%80"
    title: "Юст, Шандор"
    type:  "WIKIPEDIA"
  - url: "https://www.wikidata.org/wiki/Q1102249"
    title: "Wikidata"
    type:  "WIKIDATA"

# bio (long form, separated for readability)
bio: |
  Imported from discovery source: wikidata-dump