Granted Patent
Utility
US 5,840,643 · App. 08/577,310
Recovery of oxidation catalysts used for the production of trimellitic acid
Inventors:
Sang-Hoon Park, Jae Young Bae, Young-Sam Kim, Jae Eun Kim
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Jan 3, 1996
Inventors
Sang-Hoon Park
Jae Young Bae
Young-Sam Kim
Jae Eun Kim
Assignee (at issue)
Yukong Limited
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.