Granted Patent
Utility
US 4,246,146 · App. 06/018,974
Fire retardant coating system utilizing polyurethane hydrogel
Inventors:
Louis L. Wood, Glenn E. Fulmer
Patented Case
View Patent ↗
Granted: Jan 20, 1981
Filed: Mar 9, 1979
Inventors
Louis L. Wood
Glenn E. Fulmer
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.