Granted Patent
Utility
US 6,673,740 · App. 09/963,273
Method for preparing a catalyst for reduction of nitrogen oxides
Inventors:
Kyung Il Choi, Sang Ho Lee, Choul Woo SHIN, Jun-Seong Ahn, Jong Hyun Kim, Bong-Jea Kim
Patented Case
View Patent ↗
Granted: Jan 6, 2004
Filed: Sep 25, 2001
Inventors
Kyung Il Choi
Sang Ho Lee
Choul Woo SHIN
Jun-Seong Ahn
Jong Hyun Kim
Bong-Jea Kim
Assignee (at issue)
SK HOLDINGS CO., LTD.
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.