Granted Patent
Utility
US 5,449,457 · App. 07/688,178
Liquid membrane modules with minimal effective membrane thickness and methods of making the same
Inventor:
Ravi Prasad
Patented Case
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Granted: Sep 12, 1995
Filed: Apr 22, 1991
Inventor
Ravi Prasad
Assignee (at issue)
Hoechst Celanese Corporation
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.