Granted Patent
Utility
US 4,251,667 · App. 06/046,090
Process for the preparation of aromatic urethanes
Inventor:
Haven S. Kesling, Jr.
Patented Case
View Patent ↗
Granted: Feb 17, 1981
Filed: Jun 6, 1979
Inventor
Haven S. Kesling, Jr.
Assignee (at issue)
Atlantic Richfield 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.