Granted Patent
Utility
US 5,470,889 · App. 08/386,391
Catalyst for polyisocyanurate foams made with alternative blowing agents
Inventors:
Michael E. Londrigan, Kenneth G. Trout
Patented Case
View Patent ↗
Granted: Nov 28, 1995
Filed: Feb 10, 1995
Inventors
Michael E. Londrigan
Kenneth G. Trout
Assignee (at issue)
Celotex Corporation
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.