Granted Patent
Utility
US 4,280,970 · App. 06/004,828
Polyoxyethylene grafted membrane materials with grafting links derived from a diisocyanate
Inventor:
Robert E. Kesting
Patented Case
View Patent ↗
Granted: Jul 28, 1981
Filed: Jan 19, 1979
Inventor
Robert E. Kesting
Assignee (at issue)
Puropore, Inc.
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.