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Polyhydro-benzo [a] quinolizines

US 3,210,357 A · Inventors: IRVING TAYLOR WILLIAM et al.

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Why it's free to use

  • Granted October 5, 1965. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by October 5, 1982.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledApril 29, 1963
GrantedOctober 5, 1965
Term endedOctober 5, 1982
Application number—
Classification (CPC)C07D221/04 +1 more
Length9 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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