Granted Patent
Utility
US 4,514,524 · App. 06/630,460
Intumescent flexible polyurethane foam
Inventor:
Gerald Fesman
Patented Case
View Patent ↗
Granted: Apr 30, 1985
Filed: Jul 13, 1984
Inventor
Gerald Fesman
Assignee (at issue)
Stauffer 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.