Granted Patent
Utility
US 6,720,362 · App. 09/762,161
Perforated foams
Inventor:
Chung P. Park
Patented Case
View Patent ↗
Granted: Apr 13, 2004
Filed: Mar 12, 2001
Inventor
Chung P. Park
Assignee (at issue)
THE DOW CHEMICAL 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.