Granted Patent
Utility
US 5,854,249 · App. 08/864,667
Opioid diarylmethylpiperazines and piperidines
Inventors:
Kwen-Jen Chang, Grady Evan Boswell, Dulce Garrido Bubacz, Mark A. Collins, Ann O. Davis, Robert W. McNutt, Jr.
Patented Case
View Patent ↗
Granted: Dec 29, 1998
Filed: May 28, 1997
Inventors
Kwen-Jen Chang
Grady Evan Boswell
Dulce Garrido Bubacz
Mark A. Collins
Ann O. Davis
Robert W. McNutt, Jr.
Assignee (at issue)
Delta Pharmaceuticals Ltd.
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.