IP Library › Granted Patent US 4,722,928
Granted Patent Utility
US 4,722,928 · App. 06/803,222

N-oxide prodrug derivatives of 3-hydroxy morphinans and partial morphinans having improved oral bioavailability, pharmaceutical compositions, and processes

Inventors: George A. Boswell, Melvyn J. Myers
Patented Case View Patent ↗
Granted: Feb 2, 1988 Filed: Dec 2, 1985
Inventors
George A. Boswell
Melvyn J. Myers
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,722,928
App. No.
06/803,222
Filed
1985-12-02
Granted
1988-02-02
Kind
A