Granted Patent
Utility
US 6,719,907 · App. 10/021,478
Dual-stage filtration cartridge
Inventors:
Gregory R. Collins, James Summerton, Edward Spence
Patented Case
View Patent ↗
Granted: Apr 13, 2004
Filed: Oct 30, 2001
Inventors
Gregory R. Collins
James Summerton
Edward Spence
Assignee (at issue)
Nephros 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.