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Method of producing volatile metals from their sulphides

US 1,680,098 A · Inventors: GUSTAV FLODIN HENNING et al.

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Why it's free to use

  • Granted August 7, 1928. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by August 7, 1945.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledApril 10, 1924
GrantedAugust 7, 1928
Term endedAugust 7, 1945
Application number—
Classification (CPC)C22B19/00 +2 more
Length6 pages

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Full published documentText and every drawing sheet as a PDF.USPTOFile historyStatus, office actions, notices, fee records and petitions.USPTO Patent CenterPatent Public Search recordSearchable full text and bibliographic data.USPTO

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