Granted Patent
Utility
US 5,658,908 · App. 08/284,445
Opioid diarylmethylpiperazines and piperdines
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: Aug 19, 1997
Filed: Aug 3, 1994
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.