Granted Patent
Utility
US 6,599,621 · App. 09/812,404
High strength structural insulated panel
Inventor:
William H. Porter
Patented Case
View Patent ↗
Granted: Jul 29, 2003
Filed: Mar 20, 2001
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.