Granted Patent
Utility
US 5,766,491 · App. 08/656,705
Backflow prevention system for media bed reactor
Inventors:
Eugene E. Mazewski, Peter J. Petit, Robert Hines
Patented Case
View Patent ↗
Granted: Jun 16, 1998
Filed: Jun 3, 1996
Inventors
Eugene E. Mazewski
Peter J. Petit
Robert Hines
Assignee (at issue)
Envirex, 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.