Granted Patent
Utility
US 5,506,278 · App. 08/357,345
Polyurethane foams
Inventor:
Graham D. Walmsley
Patented Case
View Patent ↗
Granted: Apr 9, 1996
Filed: Dec 15, 1994
Inventor
Graham D. Walmsley
Assignee (at issue)
HICKORY SPRINGS MANUFACTURING 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.