Granted Patent
Utility
US 4,853,455 · App. 07/191,088
Selected phosphoric acid esters as hardeners for epoxy resins
Inventors:
Wolfgang Schneider, Kurt Amsler
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: May 6, 1988
Inventors
Wolfgang Schneider
Kurt Amsler
Assignee (at issue)
Ciba-Geigy
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.