Granted Patent
Utility
US 4,241,537 · App. 06/037,928
Plant growth media utilizing polyurethane hydrogel
Inventor:
Louis L. Wood
Patented Case
View Patent ↗
Granted: Dec 30, 1980
Filed: May 10, 1979
Inventor
Louis L. Wood
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.