Granted Patent
Utility
US 4,279,903 · App. 06/151,569
Diphydrothiazine derivatives
Inventors:
Martin L. Anderson, Roger E. Woodall
Patented Case
View Patent ↗
Granted: Jul 21, 1981
Filed: May 20, 1980
Inventors
Martin L. Anderson
Roger E. Woodall
Assignee (at issue)
SHELL OIL COMPANY
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.