Granted Patent
Utility
US 4,568,492 · App. 06/650,967
.DELTA.16-20-Keto steroid conversion to 17.alpha.-hydroxy-20-keto steroids
Inventor:
Jerry A. Walker
Patented Case
View Patent ↗
Granted: Feb 4, 1986
Filed: Sep 14, 1984
Inventor
Jerry A. Walker
Assignee (at issue)
The Upjohn Co.
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.