Granted Patent
Utility
US 5,120,770 · App. 07/442,645
Use of liquid carbon dioxide as a blowing agent in the production of open-cell polyurethane foam
Inventors:
Earl N. Doyle, Scott Carson
Patented Case
View Patent ↗
Granted: Jun 9, 1992
Filed: Nov 29, 1989
Inventors
Earl N. Doyle
Scott Carson
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.