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Separation and purification of aromatic and nonaromatic nitrogen bases

US 2,136,604 A · Inventors: BAILEY JAMES R

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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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  • Granted November 15, 1938. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by November 15, 1955.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledDecember 14, 1936
GrantedNovember 15, 1938
Term endedNovember 15, 1955
Application number—
Classification (CPC)C07D213/14 +1 more
Length6 pages

Timeline

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1937193919411943194519471949195119531955Application filedDec 14, 1936Patent grantedNov 15, 1938Term endedNov 15, 1955

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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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