Granted Patent
Utility
US 4,339,381 · App. 06/231,876
1,3-Alkylene-diazetidine-2,4-diones
Inventors:
Reinhard H. Richter, Benjamin W. Tucker, Henri Ulrich
Patented Case
View Patent ↗
Granted: Jul 13, 1982
Filed: Feb 5, 1981
Inventors
Reinhard H. Richter
Benjamin W. Tucker
Henri Ulrich
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.