Granted Patent
Utility
US 5,539,006 · App. 08/167,371
Rigid foams with improved insulation and physical properties
Inventors:
Herman P. Doerge, Edward E. Ball, Steven L. Schilling, Edward P. Squiller
Patented Case
View Patent ↗
Granted: Jul 23, 1996
Filed: Dec 15, 1993
Inventors
Herman P. Doerge
Edward E. Ball
Steven L. Schilling
Edward P. Squiller
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.