Granted Patent
Utility
US 4,877,421 · App. 07/115,927
Treatment of permeable membranes
Inventors:
Benjamin Bikson, Salvatore Giglia
Patented Case
View Patent ↗
Granted: Oct 31, 1989
Filed: Nov 2, 1987
Inventors
Benjamin Bikson
Salvatore Giglia
Assignee (at issue)
Union Carbide 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.