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Concentration of phosphate-bearing minerals

US 2,103,283 A · Inventors: TARTARON FRANCIS X 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 December 28, 1937. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by December 28, 1954.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledFebruary 4, 1937
GrantedDecember 28, 1937
Term endedDecember 28, 1954
Application number—
Classification (CPC)C05B11/02 +1 more
Length13 pages

Timeline

Timeline From USPTO dates

193819401942194419461948195019521954Application filedFeb 4, 1937Patent grantedDec 28, 1937Term endedDec 28, 1954

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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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