Granted Patent
Utility
US 4,670,346 · App. 06/869,334
Process for preparing high heat-distortion-temperature polyisocyanurate polymers
Inventor:
Stuart B. Smith
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: Jun 2, 1986
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.