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Electrolytic process for treating a ferrous sulphate solution

US 2,389,691 A · Inventors: SCHUMACHER ERWIN A et al.

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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 November 27, 1945. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by November 27, 1962.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledNovember 8, 1941
GrantedNovember 27, 1945
Term endedNovember 27, 1962
Application number—
Classification (CPC)C25C1/06 +1 more
Length3 pages

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1942194519481951195419571960Application filedNov 8, 1941Patent grantedNov 27, 1945Term endedNov 27, 1962

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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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