Granted Patent
Utility
US 5,563,180 · App. 08/500,287
Catalyst for polyisocyanurate foams made with alternative blowing agents
Inventors:
Michael J. Skowronski, Kenneth G. Trout
Patented Case
View Patent ↗
Granted: Oct 8, 1996
Filed: Jul 10, 1995
Inventors
Michael J. Skowronski
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.