Granted Patent
Utility
US 4,467,580 · App. 06/408,909
Vented insulation system
Inventor:
Gerard T. Sowinski
Patented Case
View Patent ↗
Granted: Aug 28, 1984
Filed: Aug 17, 1982
Inventor
Gerard T. Sowinski
Assignee (at issue)
National Gypsum 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.