Granted Patent
Utility
US 4,231,884 · App. 06/003,791
Water retardant insulation composition comprising treated low density granular mineral material and finely divided limestone or similar carbonate or silicate mineral particles and method for using same
Inventor:
Carl B. Dorius
Patented Case
View Patent ↗
Granted: Nov 4, 1980
Filed: Jan 16, 1979
Inventor
Carl B. Dorius
Assignee (at issue)
AMERICAN GILSONITE COMPANY
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.