Granted Patent
Utility
US 5,417,809 · App. 08/298,198
Water reuse system incorporating vacuum pump sealing water in a zero discharge process
Inventors:
Roger P. Hoffman, Gerald O. Walraven
Patented Case
View Patent ↗
Granted: May 23, 1995
Filed: Aug 31, 1994
Inventors
Roger P. Hoffman
Gerald O. Walraven
Assignee (at issue)
Hoffman Environmental System, 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.