Granted Patent
Utility
US 4,996,359 · App. 07/167,922
Process for the preparation of aromatic bis dialkyl ureas
Inventors:
Haven S. Kesling, Jr., Edward T. Shawl, John G. Zajacek
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Mar 14, 1988
Inventors
Haven S. Kesling, Jr.
Edward T. Shawl
John G. Zajacek
Assignee (at issue)
Arco Chemical Technology, L.P.
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.