Granted Patent
Utility
US 4,941,971 · App. 06/803,291
Apparatus for mounting in an aqueous system, a cartridge filter for filtering the system and in place cleaning the filter
Inventor:
Alva Z. Albright
Patented Case
View Patent ↗
Granted: Jul 17, 1990
Filed: Dec 2, 1985
Inventor
Alva Z. Albright
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.