Granted Patent
Utility
US 6,308,491 · App. 09/414,909
Structural insulated panel
Inventor:
William H. Porter
Patented Case
View Patent ↗
Granted: Oct 30, 2001
Filed: Oct 8, 1999
Inventor
William H. Porter
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.