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Froth flotation of ferruginous impurities from finely divided granite rock

US 2,578,790 A · Inventors: DUKE JAMES B

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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 December 18, 1951. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by December 18, 1968.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledMay 7, 1951
GrantedDecember 18, 1951
Term endedDecember 18, 1968
Application number—
Classification (CPC)B03D1/008 +2 more
Length5 pages

Timeline

Timeline From USPTO dates

195219541956195819601962196419661968Application filedMay 7, 1951Patent grantedDec 18, 1951Term endedDec 18, 1968

Sources & verification

Official USPTO records

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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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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