Granted Patent
Utility
US 5,185,447 · App. 07/827,429
Polycyclic ketones and preparative methods therefor
Inventor:
Edward C. Crapps
Patented Case
View Patent ↗
Granted: Feb 9, 1993
Filed: Jan 29, 1992
Inventor
Edward C. Crapps
Assignee (at issue)
The DuPont Merck Pharmaceutical 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.