Granted Patent
Utility
US 4,467,014 · App. 06/482,631
Polyisocyanurate-coated foam insulation board and method of preparation
Inventor:
Stuart B. Smith
Patented Case
View Patent ↗
Granted: Aug 21, 1984
Filed: Apr 6, 1983
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.