Granted Patent
Utility
US 5,114,582 · App. 07/684,704
Filter element and spiral-wound membrane cartridge containing same
Inventors:
Eric L. Sandstrom, Alfred Prokop, William H. Young, Anthony M. D'Urso
Patented Case
View Patent ↗
Granted: May 19, 1992
Filed: Apr 12, 1991
Inventors
Eric L. Sandstrom
Alfred Prokop
William H. Young
Anthony M. D'Urso
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.