Granted Patent
Utility
US 5,154,734 · App. 07/729,065
Pollution control system and method of using same
Inventor:
Shui-Chow Yung
Patented Case
View Patent ↗
Granted: Oct 13, 1992
Filed: Jul 12, 1991
Inventor
Shui-Chow Yung
Assignee (at issue)
Calvert Environmental, Inc.
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.