Granted Patent
Utility
US 5,131,590 · App. 07/744,367
Fibrous sprayed insulation having homogeneous density
Inventor:
Henry Sperber
Patented Case
View Patent ↗
Granted: Jul 21, 1992
Filed: Aug 13, 1991
Inventor
Henry Sperber
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.