Granted Patent
Utility
US 5,614,566 · App. 08/489,175
Method for the preparation of rigid foams having urethane and/or isocyanurate groups and being extensively open celled
Inventors:
Georg Burkhart, Helmut Schator
Patented Case
View Patent ↗
Granted: Mar 25, 1997
Filed: Jun 8, 1995
Inventors
Georg Burkhart
Helmut Schator
Assignee (at issue)
Th. Goldschmidt. AG
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.