EP0610793A1 — Tetracyclic morpholine derivatives and their use or analgesics
Assigned to Takeda Pharmaceutical Co Ltd · Expires 1994-08-17 · 32y expired
What this patent protects
A compound represented by the formula wherein X is hydrogen or a substituent; R¹ is an optionally substituted hydrocarbon residue; R² and R³ are respectively hydrogen or a substituent; and ----- ¯ shows a single bond or a double b…
USPTO Abstract
A compound represented by the formula wherein X is hydrogen or a substituent; R¹ is an optionally substituted hydrocarbon residue; R² and R³ are respectively hydrogen or a substituent; and ----- ¯ shows a single bond or a double bond, or a pharmacologically acceptable acid addition salt thereof, has an analgesic action and is useful as a medicine.
Drugs covered by this patent
Bibliographic data sourced from FDA Orange Book + USPTO public records. Plain-English summary generated by AI grounded in source text. Patent term extensions (PTR, SPC, pediatric) may shift the effective expiry. Not legal advice.
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