Granted Patent
Utility
US 6,042,958 · App. 09/063,998
Composite membranes
Inventors:
Jan Denton, John Gascoyne, Graham Alan Hards, Thomas Robertson Ralph
Patented Case
View Patent ↗
Granted: Mar 28, 2000
Filed: Apr 21, 1998
Inventors
Jan Denton
John Gascoyne
Graham Alan Hards
Thomas Robertson Ralph
Assignee (at issue)
JOHNSON MATTHEY PUBLIC LIMITED 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.