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Method of separating organic acids from petroleum oils by extracting the oil with an aqueous mixture of an amine and an alcohol

US 2,769,767 A · Inventors: CROSBY GIFFORD W 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 6, 1956. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by November 6, 1973.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJuly 3, 1953
GrantedNovember 6, 1956
Term endedNovember 6, 1973
Application number—
Classification (CPC)C10G19/00 +1 more
Length5 pages

Timeline

Timeline From USPTO dates

1954195619581960196219641966196819701972Application filedJuly 3, 1953Patent grantedNov 6, 1956Term endedNov 6, 1973

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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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