Granted Patent
Utility
US 5,166,182 · App. 07/855,487
Thermosetting plastic foams and methods of production thereof using novel blowing agents
Inventor:
Robert H. Blanpied
Patented Case
View Patent ↗
Granted: Nov 24, 1992
Filed: Mar 23, 1992
Inventor
Robert H. Blanpied
Assignee (at issue)
Atlas Roofing 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.