Granted Patent
Utility
US 6,413,304 · App. 09/658,373
Drum vent filter
Inventors:
Terry J. Wickland, Michael D. Peterson
Patented Case
View Patent ↗
Granted: Jul 2, 2002
Filed: Sep 8, 2000
Inventors
Terry J. Wickland
Michael D. Peterson
Assignee (at issue)
NUCLEAR FILTER TECHNOLOGY, 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.