Granted Patent
Utility
US 4,424,365 · App. 06/391,055
1,2,8,8a-Cyclopropac!benzo1,2,-b:-4,3-b'!dipyrrol-4(5H)-ones
Inventor:
Wendell Wierenga
Patented Case
View Patent ↗
Granted: Jan 3, 1984
Filed: Jun 22, 1982
Inventor
Wendell Wierenga
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.