Granted Patent
Utility
US 5,849,255 · App. 08/659,210
Treatment of diesel exhaust gas using zeolite catalyst
Inventors:
John E. Sawyer, Jack C. Summers
Patented Case
View Patent ↗
Granted: Dec 15, 1998
Filed: Jun 5, 1996
Inventors
John E. Sawyer
Jack C. Summers
Assignee (at issue)
ASEC Manufacturing
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.