Granted Patent
Utility
US 4,322,299 · App. 06/179,050
Method of simultaneous air-water wash of multiple-media filters
Inventors:
John Scholten, James C. Young
Patented Case
View Patent ↗
Granted: Mar 30, 1982
Filed: Aug 18, 1980
Inventors
John Scholten
James C. Young
Assignee (at issue)
General Filter Company
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.