Granted Patent
Utility
US 4,787,976 · App. 06/728,008
Non-adsorptive, semipermeable filtration membrane
Inventors:
Marc E. Parham, Karen E. Milligan
Patented Case
View Patent ↗
Granted: Nov 29, 1988
Filed: Apr 29, 1985
Inventors
Marc E. Parham
Karen E. Milligan
Assignee (at issue)
W. R. Grace & Co.
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.