Granted Patent
Utility
US 4,237,182 · App. 06/956,812
Method of sealing interior mine surface with a fire retardant hydrophilic polyurethane foam and resulting product
Inventors:
Glenn E. Fulmer, Robert M. Murch
Patented Case
View Patent ↗
Granted: Dec 2, 1980
Filed: Nov 2, 1978
Inventors
Glenn E. Fulmer
Robert M. Murch
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.