Granted Patent
Utility
US 4,826,944 · App. 07/094,205
Polyurethane casting resins
Inventors:
Rainer Hoefer, Bert Gruber, Alfred Meffert, Roland Gruetzmacher
Patented Case
View Patent ↗
Granted: May 2, 1989
Filed: Sep 4, 1987
Inventors
Rainer Hoefer
Bert Gruber
Alfred Meffert
Roland Gruetzmacher
Assignee (at issue)
Henkel Kommanditgesellschaft auf Aktien
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.