Granted Patent
Utility
US 4,304,907 · App. 05/252,030
Bicyclo lactone intermediates for prostaglandin analogs
Inventor:
Norman A. Nelson
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: May 10, 1972
Inventor
Norman A. Nelson
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.