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Alkanoic acid esters of tetracycline antibiotics

US 2,812,349 A · Inventors: GORDON PHILIP N

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  • Granted November 5, 1957. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by November 5, 1974.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledMarch 11, 1954
GrantedNovember 5, 1957
Term endedNovember 5, 1974
Application number—
Classification (CPC)C07C233/00
Length3 pages

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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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