Granted Patent
Utility
US 5,490,926 · App. 08/332,013
Spiral-wound filtration cartridge with longitudinal bypass feature
Inventor:
Michael Hammeken
Patented Case
View Patent ↗
Granted: Feb 13, 1996
Filed: Oct 31, 1994
Inventor
Michael Hammeken
Assignee (at issue)
W.R. Grace & Co. Conn.
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.