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Process of reducing aluminium from its fluoride salts by electrolysis

US 400,664 A

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Listed from its USPTO record in Patent Yard's full-term archive. Its claims, description and drawings are in the USPTO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Granted April 2, 1889. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by April 2, 1906.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJuly 9, 1886
GrantedApril 2, 1889
Term endedApril 2, 1906
Application number—
Classification (CPC)C25C3/06
Length3 pages

Timeline

Timeline From USPTO dates

1887188918911893189518971899190119031905Application filedJuly 9, 1886Patent grantedApril 2, 1889Term endedApril 2, 1906

Sources & verification

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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

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comJustia PatentsFull text, claims and classification.patents.justia.comFreePatentsOnlineFull text and PDF.freepatentsonline.comEspacenetForeign family and legal status.European Patent Office

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