Granted Patent
Utility
US 5,603,835 · App. 08/278,352
Trimethylolpropane color improvement
Inventors:
Hung-Cheun Cheung, Rodolfo W. Laurel, George C. Seaman
Patented Case
View Patent ↗
Granted: Feb 18, 1997
Filed: Jul 21, 1994
Inventors
Hung-Cheun Cheung
Rodolfo W. Laurel
George C. Seaman
Assignee (at issue)
Hoechst Celanese 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.