Granted Patent
Utility
US 4,390,642 · App. 06/281,290
Flame-retardant, thermosetting foam product and method of preparing same
Inventor:
Stuart B. Smith
Patented Case
View Patent ↗
Granted: Jun 28, 1983
Filed: Jul 7, 1981
Inventor
Stuart B. Smith
Assignee (at issue)
Thermocell Development, Ltd.
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.