Granted Patent
Utility
US 5,962,542 · App. 09/155,082
Process for producing hydrocarbon-blown hard polyurethane foams
Inventors:
Karl Werner Dietrich, Norbert Eisen, Gerhard Heilig
Patented Case
View Patent ↗
Granted: Oct 5, 1999
Filed: Sep 18, 1998
Inventors
Karl Werner Dietrich
Norbert Eisen
Gerhard Heilig
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.