Granted Patent
Utility
US 4,137,200 · App. 05/805,458
Crosslinked hydrophilic foams and method
Inventors:
Louis L. Wood, Kurt C. Frisch
Patented Case
View Patent ↗
Granted: Jan 30, 1979
Filed: Jun 10, 1977
Inventors
Louis L. Wood
Kurt C. Frisch
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.