Granted Patent
Utility
US 4,303,780 · App. 06/124,998
Ureylenes and uses thereof
Inventor:
Thomas J. Bellos
Patented Case
View Patent ↗
Granted: Dec 1, 1981
Filed: Feb 26, 1980
Inventor
Thomas J. Bellos
Assignee (at issue)
Petrolite Corporation
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.