Granted Patent
Utility
US 4,301,283 · App. 06/185,990
Process for preparing 2-oxo-dihydrobenzo(d)(1,3)-oxazines
Inventors:
John G. Thorpe, Peter G. Urben
Patented Case
View Patent ↗
Granted: Nov 17, 1981
Filed: Sep 10, 1980
Inventors
John G. Thorpe
Peter G. Urben
Assignee (at issue)
Sterling Drug, Inc.
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.