Granted Patent
Utility
US 5,714,072 · App. 08/552,528
Method for solvent extraction using a dual-skinned asymmetric microporous membrane
Inventors:
Bradley W. Reed, Kamalesh K. Sirkar
Patented Case
View Patent ↗
Granted: Feb 3, 1998
Filed: Nov 6, 1995
Inventors
Bradley W. Reed
Kamalesh K. Sirkar
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.