Granted Patent
Utility
US 4,632,989 · App. 06/737,837
Isocyanurate preparation
Inventor:
Dale F. Regelman
Patented Case
View Patent ↗
Granted: Dec 30, 1986
Filed: May 28, 1985
Inventor
Dale F. Regelman
Assignee (at issue)
THE DOW 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.