Granted Patent
Utility
US 5,889,066 · App. 08/152,446
Rigid foams with improved insulation properties and a process for the production of such foams
Inventor:
Herman P. Doerge
Patented Case
View Patent ↗
Granted: Mar 30, 1999
Filed: Sep 14, 1998
Inventor
Herman P. Doerge
Assignee (at issue)
Bayer Aktiengesellschaft
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.